mkdocs: bump version

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com> (cherry picked from commit 565fd254d0)
CHANGELOG: add 0.29.3
2026-07-30 11:50:44 +09:00 · 2026-07-29 14:35:31 +02:00 · 2026-07-29 14:35:31 +02:00 · 2026-07-29 14:35:31 +02:00 · 2026-07-29 14:35:31 +02:00 · 2026-07-29 14:35:31 +02:00
108 changed files with 10446 additions and 869 deletions
@@ -332,6 +332,7 @@ jobs:
          - TestSSHCheckModeUnapprovedTimeout
          - TestSSHCheckModeCheckPeriodCLI
          - TestSSHCheckModeAutoApprove
+          - TestSSHCheckModeSessionLossReDelegates
          - TestSSHCheckModeNegativeCLI
          - TestSSHLocalpart
          - TestTagsAuthKeyWithTagRequestDifferentTag
@@ -339,6 +340,8 @@ jobs:
          - TestTagsAuthKeyWithTagCannotAddViaCLI
          - TestTagsAuthKeyWithTagCannotChangeViaCLI
          - TestTagsAuthKeyWithTagAdminOverrideReauthPreserves
+          - TestTagsReauthDifferentKeyRetagsNode
+          - TestTagsReauthDifferentKeyRemovesTag
          - TestTagsAuthKeyWithTagCLICannotModifyAdminTags
          - TestTagsAuthKeyWithoutTagCannotRequestTags
          - TestTagsAuthKeyWithoutTagRegisterNoTags
@@ -366,6 +369,12 @@ jobs:
          - TestTagsAuthKeyWithoutUserInheritsTags
          - TestTagsAuthKeyWithoutUserRejectsAdvertisedTags
          - TestTagsAuthKeyConvertToUserViaCLIRegister
+          - TestTaggedNodeLogoutReloginSingleUseKeyOnline
+          - TestTaggedNodeLogoutReloginReusableKeyOnline
+          - TestTagsOIDCReauthAddOwnedTag
+          - TestTagsReauthEmptyTagsReturnsToUserSurvives
+          - TestTS2021WebSocketGET
+          - TestTS2021WASMClientUnderNode
          - TestTailscaleRustAxum
    uses: ./.github/workflows/integration-test-template.yml
    secrets: inherit
@@ -1,6 +1,38 @@
 # CHANGELOG

-## 0.29.0 (202x-xx-xx)
+## 0.29.3 (2026-07-29)
+
+**Minimum supported Tailscale client version: v1.80.0**
+
+### Changes
+
+- Fix tagged node stuck expired after `tailscale logout`, unable to re-authenticate [#3394](https://github.com/juanfont/headscale/pull/3394)
+- Re-registering a tagged node with a different pre-auth key now applies the new key's tags instead of silently keeping the old ones [#3394](https://github.com/juanfont/headscale/pull/3394)
+- Fix re-authenticating an already-tagged node with `--advertise-tags` being rejected when the authenticating user owns the tags [#3394](https://github.com/juanfont/headscale/pull/3394)
+- Fix ephemeral nodes lingering as disconnected after reconnect churn [#3383](https://github.com/juanfont/headscale/pull/3383)
+- Fix node registration falsely returning `401 registration timed out` when auth completes as the request context expires [#3392](https://github.com/juanfont/headscale/pull/3392)
+- Check the machine key on the followup registration poll so a leaked auth ID cannot return the registering user's identity [#3393](https://github.com/juanfont/headscale/pull/3393)
+- Reject `/key` requests below the supported capability version floor, matching `/ts2021` [#3391](https://github.com/juanfont/headscale/pull/3391)
+
+## 0.29.2 (2026-07-01)
+
+**Minimum supported Tailscale client version: v1.80.0**
+
+### Changes
+
+- Fix map generation serializing on the policy lock, so a mass reconnect on `autogroup:self`, via or relay policies no longer stalls clients into `unexpected EOF` retry loops [#3358](https://github.com/juanfont/headscale/pull/3358)
+- Fix `/ts2021` rejecting the WebSocket `GET` upgrade with 405, which prevented Tailscale JS/WASM control clients from connecting [#3359](https://github.com/juanfont/headscale/pull/3359)
+- Gracefully handle nodes with an invalid FQDN (empty or too long) instead of failing map delivery; offending names are logged at startup with the fix command [#3349](https://github.com/juanfont/headscale/pull/3349)
+
+## 0.29.1 (2026-06-18)
+
+**Minimum supported Tailscale client version: v1.80.0**
+
+### Changes
+
+- Fix nodes with `tags='null'` losing their assigned user on upgrade [#3325](https://github.com/juanfont/headscale/pull/3325)
+
+## 0.29.0 (2026-06-17)

 **Minimum supported Tailscale client version: v1.80.0**

@@ -308,6 +340,7 @@ connected" routers that maintain their control session but cannot route packets.
 - Fix user-owned re-registration with zero client expiry and no default storing `0001-01-01 00:00:00` in the database instead of `NULL` [#3199](https://github.com/juanfont/headscale/pull/3199)
 - Fix `tailscaled` restart on a node with no expiry resetting `NULL` to `0001-01-01 00:00:00` in the database, affecting both tagged and untagged nodes [#3197](https://github.com/juanfont/headscale/pull/3197)
 - Backfill `nodes.expiry` rows persisted by older versions as `0001-01-01 00:00:00` to `NULL`, so nodes upgraded from <0.28 stop reporting as expired [#3284](https://github.com/juanfont/headscale/issues/3284)
+- Update reverse proxy documentation for `trusted_proxies` configuration option [#3292](https://github.com/juanfont/headscale/pull/3292)

 ## 0.28.0 (2026-02-04)

@@ -1,6 +1,6 @@
 # For testing purposes only

-FROM golang:1.26.3-alpine AS build-env
+FROM golang:1.26.5-alpine AS build-env

 WORKDIR /go/src

@@ -2,7 +2,7 @@
 # and are in no way endorsed by Headscale's maintainers as an
 # official nor supported release or distribution.

-FROM docker.io/golang:1.26.3-trixie AS builder
+FROM docker.io/golang:1.26.5-trixie AS builder
 ARG VERSION=dev
 ENV GOPATH /go
 WORKDIR /go/src/headscale
@@ -4,7 +4,7 @@
 # This Dockerfile is more or less lifted from tailscale/tailscale
 # to ensure a similar build process when testing the HEAD of tailscale.

-FROM golang:1.26.3-alpine AS build-env
+FROM golang:1.26.5-alpine AS build-env

 WORKDIR /go/src

@@ -0,0 +1,30 @@
+# For integration testing only.
+#
+# Builds the Tailscale control client (integration/wasmic/wasmclient) for
+# GOOS=js/GOARCH=wasm and packages it with Go's wasm_exec Node runner. The
+# container idles; the integration test execs
+#   node /app/wasm_exec_node.js /app/client.wasm <control-url>
+# to drive a real browser-style WebSocket GET against headscale's /ts2021,
+# guarding the regression in issue #3357.
+
+FROM golang:1.26.5-alpine AS build
+
+WORKDIR /src
+
+# Only the module metadata and the wasm client package are needed to build the
+# js/wasm binary; its imports (tailscale.com/control/controlhttp, ...) resolve
+# from the module proxy.
+COPY go.mod go.sum ./
+COPY integration/wasmic/wasmclient ./integration/wasmic/wasmclient
+
+RUN GOOS=js GOARCH=wasm go build -o /out/client.wasm ./integration/wasmic/wasmclient \
+    && cp "$(go env GOROOT)/lib/wasm/wasm_exec.js" /out/wasm_exec.js \
+    && cp "$(go env GOROOT)/lib/wasm/wasm_exec_node.js" /out/wasm_exec_node.js
+
+FROM node:24-alpine
+
+WORKDIR /app
+COPY --from=build /out/ /app/
+
+# Idle; the test execs the client on demand with the headscale control URL.
+ENTRYPOINT ["tail", "-f", "/dev/null"]
@@ -1,42 +1,55 @@
-# Running headscale behind a reverse proxy
+# Running Headscale behind a reverse proxy

 !!! warning "Community documentation"

-    This page is not actively maintained by the headscale authors and is
-    written by community members. It is _not_ verified by headscale developers.
+    This page is not actively maintained by the Headscale authors and is
+    written by community members. It is _not_ verified by Headscale developers.

    **It might be outdated and it might miss necessary steps**.

-Running headscale behind a reverse proxy is useful when running multiple applications on the same server, and you want to reuse the same external IP and port - usually tcp/443 for HTTPS.
+Running Headscale behind a reverse proxy is useful when running multiple applications on the same server, and you want
+to reuse the same external IP and port - usually tcp/443 for HTTPS.

-### WebSockets
+Please see [limitations](#limitations) for known issues and limitations.

-The reverse proxy MUST be configured to support WebSockets to communicate with Tailscale clients.
+## Configuration

-WebSockets support is also required when using the Headscale [embedded DERP server](../derp.md). In this case, you will also need to expose the UDP port used for STUN (by default, udp/3478). Please check our [config-example.yaml](https://github.com/juanfont/headscale/blob/main/config-example.yaml).
+The configuration depends on the set of Headscale features you intend to use. Please have a look at the
+[requirements](../../setup/requirements.md) and especially the [ports in use](../../setup/requirements.md#ports-in-use)
+section to learn what a Tailscale clients expects.

-### Cloudflare
+The configuration examples in this documentation are basic and cover only HTTP and HTTPS traffic. Other features such as
+STUN for Headscale's [embedded DERP server](../derp.md) are expected to be exposed directly or to be only available on
+localhost.

-Running headscale behind a cloudflare proxy or cloudflare tunnel is not supported and will not work as Cloudflare does not support WebSocket POSTs as required by the Tailscale protocol. See [this issue](https://github.com/juanfont/headscale/issues/1468)
+### WebSocket
+
+Tailscale clients are using a custom protocol (Tailscale Control Protocol) to communicate with a control server such as
+Headscale. The reverse proxy **must** be configured to support WebSockets in order to communicate with Tailscale clients
+and it needs to handle two peculiarities of the Tailscale Control Protocol:
+
+- The POST method is used to upgrade the WebSocket connection.
+- The value for the `Upgrade` header is `tailscale-control-protocol`.

 ### TLS

-Headscale can be configured not to use TLS, leaving it to the reverse proxy to handle. Add the following configuration values to your headscale config file.
+Headscale can be configured not to use TLS, leaving it to the reverse proxy to handle. Add the following configuration
+values to your Headscale [configuration file](../configuration.md):

-```yaml title="config.yaml"
-server_url: https://<YOUR_SERVER_NAME> # This should be the FQDN at which headscale will be served
-listen_addr: 0.0.0.0:8080
-metrics_listen_addr: 0.0.0.0:9090
+```yaml title="config.yaml" hl_lines="1"
+server_url: https://<SERVER_NAME>
 tls_cert_path: ""
 tls_key_path: ""
 ```

+Headscale logs `WRN listening without TLS but ServerURL does not start with http://` during startup. This is expected
+and indicates that the reverse proxy is in charge of terminating TLS.
+
 ### Trusted proxies

-Headscale ignores `True-Client-IP`, `X-Real-IP` and `X-Forwarded-For`
-unless the request's TCP peer matches `trusted_proxies`. Set this to
-the CIDR(s) your reverse proxy connects from so the real client IP
-appears in access logs:
+Headscale ignores `True-Client-IP`, `X-Real-IP` and `X-Forwarded-For` headers unless the request's TCP peer matches the
+`trusted_proxies` configuration option. Set this to the CIDR(s) your reverse proxy connects from so the real client IP
+appears in access logs.

 ```yaml title="config.yaml"
 trusted_proxies:
@@ -44,71 +57,130 @@ trusted_proxies:
  - ::1/128
 ```

-The reverse proxy must also strip any client-supplied
-`True-Client-IP` / `X-Real-IP` / `X-Forwarded-For` on inbound requests
-and set its own values. nginx's `$proxy_add_x_forwarded_for` only
-appends to whatever the client sent — pair it with
-`proxy_set_header X-Real-IP $remote_addr;` and clear the inbound XFF
-yourself if your nginx version does not do so.
+The reverse proxy is responsible to replace any client-supplied `True-Client-IP`, `X-Real-IP`, `X-Forwarded-For` headers
+on inbound requests with sanitized values. Headscale picks the first valid IP address supplied by headers in this order:

-Leaving `trusted_proxies` empty when there is no proxy in front is
-safe: the headers are dropped from every request and the access log
-shows the directly-connecting TCP peer.
+- `True-Client-IP`
+- `X-Real-IP`
+- `X-Forwarded-For`

-## nginx
+## Limitations

-The following example configuration can be used in your nginx setup, substituting values as necessary. `<IP:PORT>` should be the IP address and port where headscale is running. In most cases, this will be `http://localhost:8080`.
+- A reverse proxy adds another layer of complexity that needs to be able to handle the [Tailscale Control
+  Protocol](#websocket) properly. Be sure to test your setup without a reverse proxy before raising an issue.
+- STUN (used along with the [embedded DERP server](../derp.md)) requires udp/3478 to be served publicly.
+- [gRPC](../api.md#grpc) (used to remote control Headscale) may not be proxied.

-```nginx title="nginx.conf"
-map $http_upgrade $connection_upgrade {
-    default      upgrade;
-    ''           close;
+## Reverse proxy specific configuration
+
+!!! warning "Third-party software and services"
+
+    This section of the documentation is specific for third-party software and services. We recommend users read the
+    third-party documentation for a secure configuration.
+
+This following Headscale configuration may be used as base for the various reverse proxy examples below. The following
+is [assumed](../../setup/requirements.md):
+
+- Service for Tailscale clients is served via HTTPS on port 443.
+- The reverse proxy redirects HTTP to HTTPS and is terminating TLS.
+- Both Headscale and the reverse proxy are running on the same host.
+- [Metrics](../debug.md#metrics-and-debug-endpoint) and [gRPC](../api.md#grpc) are not proxied, those are available via
+  localhost.
+
+```yaml title="config.yaml" hl_lines="1"
+server_url: https://<SERVER_NAME>
+listen_addr: 127.0.0.1:8080
+metrics_listen_addr: 127.0.0.1:9090
+grpc_listen_addr: 127.0.0.1:50443
+trusted_proxies:
+  - 127.0.0.1/32
+  - ::1/128
+tls_cert_path: ""
+tls_key_path: ""
+```
+
+### Apache
+
+The following basic Apache configuration works with the Headscale configuration [as shown
+above](#reverse-proxy-specific-configuration). Substitute placeholders and adjust the configuration as needed:
+
+- `<SERVER_NAME>`: The server name for your instance, e.g. `headscale.example.com`
+- `<PATH_TO_TLS_CERT>`: Absolute path to your TLS certificate
+- `<PATH_TO_TLS_KEY>`: Absolute path to your TLS private key
+
+```apache title="apache.conf" hl_lines="2 7 11 14-15"
+<VirtualHost *:80>
+  ServerName <SERVER_NAME>
+
+  # Tailscale captive portal detection
+  RedirectMatch 204 ^/generate_204$
+
+  RedirectMatch permanent "^/(.*)$" "https://<SERVER_NAME>/$1"
+</VirtualHost>
+
+<VirtualHost *:443>
+  ServerName <SERVER_NAME>
+
+  SSLEngine On
+  SSLCertificateFile <PATH_TO_TLS_CERT>
+  SSLCertificateKeyFile <PATH_TO_TLS_KEY>
+
+  RequestHeader set True-Client-IP "%{REMOTE_ADDR}s"
+  RequestHeader set X-Real-IP "%{REMOTE_ADDR}s"
+
+  ProxyPreserveHost On
+  ProxyPass / http://127.0.0.1:8080/ upgrade=any
+</VirtualHost>
+```
+
+Note that `upgrade=any` is required as a parameter for `ProxyPass` so that WebSocket traffic whose `Upgrade` header
+value is not equal to `WebSocket` (i. e. Tailscale Control Protocol) is forwarded correctly. See the [Apache
+docs](https://httpd.apache.org/docs/current/mod/mod_proxy.html#upgrade) for more information on this.
+
+### Caddy
+
+The following basic Caddyfile works with the Headscale configuration [as shown
+above](#reverse-proxy-specific-configuration). Substitute placeholders and adjust the configuration as needed:
+
+- `<SERVER_NAME>`: The server name for your instance, e.g. `headscale.example.com`
+
+```none title="Caddyfile" hl_lines="1 12"
+http://<SERVER_NAME> {
+	# Tailscale captive portal detection
+	handle /generate_204 {
+		respond 204
+	}
+
+	handle * {
+		redir https://{host}{uri}
+	}
 }

-server {
-    listen 80;
-	listen [::]:80;
-
-	listen 443      ssl http2;
-	listen [::]:443 ssl http2;
-
-    server_name <YOUR_SERVER_NAME>;
-
-    ssl_certificate <PATH_TO_CERT>;
-    ssl_certificate_key <PATH_CERT_KEY>;
-    ssl_protocols TLSv1.2 TLSv1.3;
-
-    location / {
-        proxy_pass http://<IP:PORT>;
-        proxy_http_version 1.1;
-        proxy_set_header Upgrade $http_upgrade;
-        proxy_set_header Connection $connection_upgrade;
-        proxy_set_header Host $server_name;
-        proxy_redirect http:// https://;
-        proxy_buffering off;
-        proxy_set_header X-Real-IP $remote_addr;
-        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-        proxy_set_header X-Forwarded-Proto $scheme;
-        add_header Strict-Transport-Security "max-age=15552000; includeSubDomains" always;
-    }
+<SERVER_NAME> {
+	reverse_proxy 127.0.0.1:8080 {
+		header_up True-Client-IP {remote_host}
+		header_up X-Real-IP {remote_host}
+	}
 }
 ```

-## istio/envoy
+Caddy will [automatically](https://caddyserver.com/docs/automatic-https) provision a certificate for your
+domain/subdomain, force HTTPS, and proxy WebSocket connections.

-If you using [Istio](https://istio.io/) ingressgateway or [Envoy](https://www.envoyproxy.io/) as reverse proxy, there are some tips for you. If not set, you may see some debug log in proxy as below:
+### Cloudflare

-```log
-Sending local reply with details upgrade_failed
-```
+Running Headscale behind a Cloudflare Proxy or Cloudflare Tunnel is not supported and will not work as Cloudflare does
+not support [WebSocket POSTs as required by the Tailscale protocol](#websocket). See [issue
+1468](https://github.com/juanfont/headscale/issues/1468) for more information.

 ### Envoy

-You need to add a new upgrade_type named `tailscale-control-protocol`. [see details](https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/filters/network/http_connection_manager/v3/http_connection_manager.proto#extensions-filters-network-http-connection-manager-v3-httpconnectionmanager-upgradeconfig)
+You need to add a new upgrade_type named `tailscale-control-protocol`. [See
+details](https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/filters/network/http_connection_manager/v3/http_connection_manager.proto#extensions-filters-network-http-connection-manager-v3-httpconnectionmanager-upgradeconfig).

 ### Istio

-Same as envoy, we can use `EnvoyFilter` to add upgrade_type.
+Same as [envoy](#envoy), we can use `EnvoyFilter` to add a new upgrade_type named `tailscale-control-protocol`.

 ```yaml
 apiVersion: networking.istio.io/v1alpha3
@@ -133,33 +205,68 @@ spec:
              - upgrade_type: tailscale-control-protocol
 ```

-## Caddy
+### Nginx

-The following Caddyfile is all that is necessary to use Caddy as a reverse proxy for headscale, in combination with the `config.yaml` specifications above to disable headscale's built in TLS. Replace values as necessary - `<YOUR_SERVER_NAME>` should be the FQDN at which headscale will be served, and `<IP:PORT>` should be the IP address and port where headscale is running. In most cases, this will be `localhost:8080`.
+The following basic Nginx configuration works with the Headscale configuration [as shown
+above](#reverse-proxy-specific-configuration). Substitute placeholders and adjust the configuration as needed:

-```none title="Caddyfile"
-<YOUR_SERVER_NAME> {
-    reverse_proxy <IP:PORT>
+- `<SERVER_NAME>`: The server name for your instance, e.g. `headscale.example.com`
+- `<PATH_TO_TLS_CERT>`: Absolute path to your TLS certificate
+- `<PATH_TO_TLS_KEY>`: Absolute path to your TLS private key
+
+```nginx title="nginx.conf" hl_lines="19 37 39-40"
+# headscale
+upstream headscale {
+  zone upstreams 64K;
+  server 127.0.0.1:8080 max_fails=1 fail_timeout=5s;
+  keepalive 2;
+}
+
+# websocket
+map $http_upgrade $connection_upgrade {
+  default keep-alive;
+  ''      close;
+}
+
+# http
+server {
+  listen 80;
+  listen [::]:80;
+
+  server_name <SERVER_NAME>;
+
+  # Tailscale captive portal detection
+  location = /generate_204 {
+    return 204;
+  }
+
+  location / {
+    return 301 https://$server_name$request_uri;
+  }
+}
+
+# https
+server {
+  listen 443 ssl;
+  listen [::]:443 ssl;
+  http2 on;
+
+  server_name <SERVER_NAME>;
+
+  ssl_certificate <PATH_TO_TLS_CERT>;
+  ssl_certificate_key <PATH_TO_TLS_KEY>;
+
+  location / {
+    proxy_http_version 1.1;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection $connection_upgrade;
+    proxy_set_header Host $host;
+    proxy_set_header True-Client-IP $remote_addr;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    proxy_buffering off;
+    proxy_pass http://headscale;
+  }
 }
 ```
-
-Caddy v2 will [automatically](https://caddyserver.com/docs/automatic-https) provision a certificate for your domain/subdomain, force HTTPS, and proxy websockets - no further configuration is necessary.
-
-For a slightly more complex configuration which utilizes Docker containers to manage Caddy, headscale, and Headscale-UI, [Guru Computing's guide](https://blog.gurucomputing.com.au/smart-vpns-with-headscale/) is an excellent reference.
-
-## Apache
-
-The following minimal Apache config will proxy traffic to the headscale instance on `<IP:PORT>`. Note that `upgrade=any` is required as a parameter for `ProxyPass` so that WebSockets traffic whose `Upgrade` header value is not equal to `WebSocket` (i. e. Tailscale Control Protocol) is forwarded correctly. See the [Apache docs](https://httpd.apache.org/docs/2.4/mod/mod_proxy_wstunnel.html) for more information on this.
-
-```apache title="apache.conf"
-<VirtualHost *:443>
-	ServerName <YOUR_SERVER_NAME>
-
-	ProxyPreserveHost On
-	ProxyPass / http://<IP:PORT>/ upgrade=any
-
-	SSLEngine On
-	SSLCertificateFile <PATH_TO_CERT>
-	SSLCertificateKeyFile <PATH_CERT_KEY>
-</VirtualHost>
-```
@@ -158,17 +158,17 @@ devices. Can only be used in policy destinations.
        {
          "src": ["boss@"],
          "dst": ["boss@"],
-          "ip": "*"
+          "ip": ["*"]
        },
        {
          "src": ["dev1@"],
          "dst": ["dev1@"],
-          "ip": "*"
+          "ip": ["*"]
        },
        {
          "src": ["intern1@"],
          "dst": ["intern1@"],
-          "ip": "*"
+          "ip": ["*"]
        }
      ]
    }
@@ -1,5 +1,27 @@
 {
  "nodes": {
+    "flake-checks": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "treefmt-nix": "treefmt-nix"
+      },
+      "locked": {
+        "lastModified": 1783015821,
+        "narHash": "sha256-vmzYTZxIAy3OYXwkRL5GQYk8fNnh8TLWcxQRIO3ywOU=",
+        "owner": "kradalby",
+        "repo": "flake-checks",
+        "rev": "3c821706eb0bd07f515f9a7726b650ccae927433",
+        "type": "github"
+      },
+      "original": {
+        "owner": "kradalby",
+        "repo": "flake-checks",
+        "type": "github"
+      }
+    },
    "flake-utils": {
      "inputs": {
        "systems": "systems"
@@ -20,16 +42,16 @@
    },
    "nixpkgs": {
      "locked": {
-        "lastModified": 1779351318,
-        "narHash": "sha256-f+JACbTqzZ+G92DSnXOUGRhGANb8Blh7CoeYOeBF8/U=",
+        "lastModified": 1784421286,
+        "narHash": "sha256-YKn3t7FvaargtyNHbrOw+qzDM+93q5kSCREUPNxeZQs=",
        "owner": "NixOS",
        "repo": "nixpkgs",
-        "rev": "4a29d733e8a7d5b824c3d8c958a946a9867b3eb2",
+        "rev": "62eaae30cd05c04718500ddb44e7ef85cd45ddd5",
        "type": "github"
      },
      "original": {
        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
+        "ref": "staging-next-26.05",
        "repo": "nixpkgs",
        "type": "github"
      }
@@ -2,7 +2,13 @@
  description = "headscale - Open Source Tailscale Control server";

  inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    # Pinned to staging-next-26.05 for Go 1.26.5: the Tailscale HEAD build
+    # (Dockerfile.tailscale-HEAD) requires go >= 1.26.5, and nixpkgs-unstable
+    # still ships 1.26.4 — the bump is merged to nixpkgs staging but the
+    # large-rebuild staging->unstable pipeline lags. The 26.05 line is otherwise
+    # current (dev tools match unstable). Switch back to nixpkgs-unstable once it
+    # ships go_1_26 >= 1.26.5.
+    nixpkgs.url = "github:NixOS/nixpkgs/staging-next-26.05";
    flake-utils.url = "github:numtide/flake-utils";
  };

@@ -26,6 +32,7 @@
      overlays.default = _: prev:
        let
          pkgs = nixpkgs.legacyPackages.${prev.stdenv.hostPlatform.system};
+          # Go 1.26 builder; resolves to Go 1.26.5 from the pinned nixpkgs.
          buildGo = pkgs.buildGo126Module;
          vendorHash = (builtins.fromJSON (builtins.readFile ./flakehashes.json)).vendor.sri;
        in
@@ -94,7 +101,8 @@
            subPackages = [ "." ];
          };

-          # Build golangci-lint with Go 1.26 (upstream uses hardcoded Go version)
+          # Build golangci-lint with stock Go 1.26 (upstream uses hardcoded Go
+          # version); it does not build against the pinned 1.26.5.
          golangci-lint = buildGo rec {
            pname = "golangci-lint";
            version = "2.12.2";
@@ -198,7 +206,7 @@
            clang-tools # clang-format
            protobuf-language-server
          ]
-          ++ lib.optional pkgs.stdenv.isLinux [ traceroute ];
+          ++ lib.optionals pkgs.stdenv.isLinux [ traceroute ];

        # Add entry to build a docker image with headscale
        # caveat: only works on Linux
@@ -229,7 +237,7 @@
              (pkgs.writeShellScriptBin
                "go-mod-update-all"
                ''
-                  cat go.mod | ${pkgs.silver-searcher}/bin/ag "\t" | ${pkgs.silver-searcher}/bin/ag -v indirect | ${pkgs.gawk}/bin/awk '{print $1}' | ${pkgs.findutils}/bin/xargs go get -u
+                  cat go.mod | ${pkgs.ripgrep}/bin/rg "\t" | ${pkgs.ripgrep}/bin/rg -v indirect | ${pkgs.gawk}/bin/awk '{print $1}' | ${pkgs.findutils}/bin/xargs go get -u
                  go mod tidy
                '')
            ];
@@ -1,6 +1,6 @@
 {
  "vendor": {
-    "goModSum": "sha256-xos6ixeJRMrEengGJaRiSsrm+3S3R0OEsnv1e85Sqhw=",
-    "sri": "sha256-bZod9sUUyQ67x/HzZrQ7SK+o5gAUxJhx7Rr6VdIUj1I="
+    "goModSum": "sha256-GFiMC2ktrQnpSVzJHabVP1TYwJvn5+a/BDLhvmGTUWc=",
+    "sri": "sha256-fzKyXNMw/2yAEhaTZu0n1NXatPO2IP0HFA2ey1vZIYM="
  }
 }
@@ -1,6 +1,6 @@
 module github.com/juanfont/headscale

-go 1.26.3
+go 1.26.5

 require (
 	github.com/arl/statsviz v0.8.0
@@ -14,13 +14,12 @@ require (
 	github.com/docker/docker v28.5.2+incompatible
 	github.com/fsnotify/fsnotify v1.10.1
 	github.com/glebarez/sqlite v1.11.0
-	github.com/go-chi/chi/v5 v5.2.5
+	github.com/go-chi/chi/v5 v5.3.0
 	github.com/go-chi/metrics v0.1.1
-	github.com/go-gormigrate/gormigrate/v2 v2.1.5
-	github.com/go-json-experiment/json v0.0.0-20260520185125-572e7c383686
+	github.com/go-gormigrate/gormigrate/v2 v2.1.6
+	github.com/go-json-experiment/json v0.0.0-20260601182631-00ed12fed2a6
 	github.com/gofrs/uuid/v5 v5.4.0
 	github.com/google/go-cmp v0.7.0
-	github.com/gorilla/mux v1.8.1
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.29.0
 	github.com/hashicorp/golang-lru/v2 v2.0.7
 	github.com/jagottsicher/termcolor v1.0.2
@@ -29,7 +28,7 @@ require (
 	github.com/philip-bui/grpc-zerolog v1.0.1
 	github.com/pkg/profile v1.7.0
 	github.com/prometheus/client_golang v1.23.2
-	github.com/prometheus/common v0.67.5
+	github.com/prometheus/common v0.68.1
 	github.com/pterm/pterm v0.12.83
 	github.com/puzpuzpuz/xsync/v4 v4.5.0
 	github.com/realclientip/realclientip-go v1.0.0
@@ -41,22 +40,22 @@ require (
 	github.com/stretchr/testify v1.11.1
 	github.com/tailscale/hujson v0.0.0-20260302212456-ecc657c15afd
 	github.com/tailscale/squibble v0.0.0-20260411062017-141f5d618bc4
-	github.com/tailscale/tailsql v0.0.0-20260521144131-377d992d0d71
+	github.com/tailscale/tailsql v0.0.0-20260522170732-77aec5aabc76
 	github.com/tcnksm/go-latest v0.0.0-20170313132115-e3007ae9052e
 	go4.org/netipx v0.0.0-20231129151722-fdeea329fbba
-	golang.org/x/crypto v0.52.0
-	golang.org/x/exp v0.0.0-20260508232706-74f9aab9d74a
-	golang.org/x/net v0.55.0
+	golang.org/x/crypto v0.53.0
+	golang.org/x/exp v0.0.0-20260603202125-055de637280b
+	golang.org/x/net v0.56.0
 	golang.org/x/oauth2 v0.36.0
-	golang.org/x/sync v0.20.0
-	google.golang.org/genproto/googleapis/api v0.0.0-20260519071638-aa98bba5eb94
+	golang.org/x/sync v0.21.0
+	google.golang.org/genproto/googleapis/api v0.0.0-20260610212136-7ab31c22f7ad
 	google.golang.org/grpc v1.81.1
 	google.golang.org/protobuf v1.36.11
 	gopkg.in/yaml.v3 v3.0.1
 	gorm.io/driver/postgres v1.6.0
 	gorm.io/gorm v1.31.1
 	pgregory.net/rapid v1.3.0
-	tailscale.com v1.98.3
+	tailscale.com v1.101.0-pre
 	zombiezen.com/go/postgrestest v1.0.1
 )

@@ -81,7 +80,7 @@ require (
 	modernc.org/libc v1.72.3 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
 	modernc.org/memory v1.11.0 // indirect
-	modernc.org/sqlite v1.50.1
+	modernc.org/sqlite v1.52.0
 )

 // NOTE: gvisor must be updated in lockstep with
@@ -94,7 +93,7 @@ require gvisor.dev/gvisor v0.0.0-20260224225140-573d5e7127a8 // indirect

 require (
 	atomicgo.dev/cursor v0.2.0 // indirect
-	atomicgo.dev/keyboard v0.2.9 // indirect
+	atomicgo.dev/keyboard v0.2.10 // indirect
 	atomicgo.dev/schedule v0.1.0 // indirect
 	dario.cat/mergo v1.0.2 // indirect
 	filippo.io/edwards25519 v1.2.0 // indirect
@@ -127,16 +126,16 @@ require (
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/clipperhouse/uax29/v2 v2.7.0 // indirect
 	github.com/containerd/console v1.0.5 // indirect
-	github.com/containerd/continuity v0.4.5 // indirect
+	github.com/containerd/continuity v0.5.0 // indirect
 	github.com/containerd/errdefs v1.0.0 // indirect
 	github.com/containerd/errdefs/pkg v0.3.0 // indirect
-	github.com/creachadair/mds v0.28.0 // indirect
+	github.com/creachadair/mds v0.29.0 // indirect
 	github.com/creachadair/msync v0.8.2 // indirect
 	github.com/dblohm7/wingoes v0.0.0-20250822163801-6d8e6105c62d // indirect
 	github.com/dgryski/go-metro v0.0.0-20250106013310-edb8663e5e33 // indirect
 	github.com/distribution/reference v0.6.0 // indirect
-	github.com/docker/cli v29.4.0+incompatible // indirect
-	github.com/docker/go-connections v0.6.0 // indirect
+	github.com/docker/cli v29.5.3+incompatible // indirect
+	github.com/docker/go-connections v0.7.0 // indirect
 	github.com/docker/go-units v0.5.0 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/felixge/fgprof v0.9.5 // indirect
@@ -150,6 +149,7 @@ require (
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-viper/mapstructure/v2 v2.5.0 // indirect
+	github.com/go4org/hashtriemap v0.0.0-20251130024219-545ba229f689 // indirect
 	github.com/godbus/dbus/v5 v5.2.2 // indirect
 	github.com/golang-jwt/jwt/v5 v5.3.1 // indirect
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
@@ -158,18 +158,18 @@ require (
 	github.com/google/btree v1.1.3 // indirect
 	github.com/google/go-github v17.0.0+incompatible // indirect
 	github.com/google/go-querystring v1.2.0 // indirect
-	github.com/google/pprof v0.0.0-20260202012954-cb029daf43ef // indirect
+	github.com/google/pprof v0.0.0-20260604005048-7023385849c0 // indirect
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
 	github.com/google/uuid v1.6.0 // indirect
-	github.com/gookit/color v1.6.0 // indirect
+	github.com/gookit/color v1.6.1 // indirect
 	github.com/gorilla/websocket v1.5.4-0.20250319132907-e064f32e3674 // indirect
-	github.com/hashicorp/go-version v1.8.0 // indirect
+	github.com/hashicorp/go-version v1.9.0 // indirect
 	github.com/hdevalence/ed25519consensus v0.2.0 // indirect
 	github.com/huin/goupnp v1.3.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
-	github.com/jackc/pgx/v5 v5.9.2 // indirect
+	github.com/jackc/pgx/v5 v5.10.0 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
@@ -177,18 +177,18 @@ require (
 	github.com/jsimonetti/rtnetlink v1.4.2 // indirect
 	github.com/kamstrup/intmap v0.5.2 // indirect
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
-	github.com/klauspost/compress v1.18.5 // indirect
-	github.com/lib/pq v1.11.1 // indirect
+	github.com/klauspost/compress v1.18.6 // indirect
+	github.com/lib/pq v1.12.3 // indirect
 	github.com/lithammer/fuzzysearch v1.1.8 // indirect
-	github.com/mattn/go-colorable v0.1.14 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/mattn/go-runewidth v0.0.20 // indirect
+	github.com/mattn/go-colorable v0.1.15 // indirect
+	github.com/mattn/go-isatty v0.0.22 // indirect
+	github.com/mattn/go-runewidth v0.0.24 // indirect
 	github.com/mdlayher/netlink v1.8.0 // indirect
 	github.com/mdlayher/socket v0.5.1 // indirect
 	github.com/mitchellh/go-ps v1.0.0 // indirect
 	github.com/moby/docker-image-spec v1.3.1 // indirect
-	github.com/moby/moby/api v1.54.1 // indirect
-	github.com/moby/moby/client v0.4.0 // indirect
+	github.com/moby/moby/api v1.54.2 // indirect
+	github.com/moby/moby/client v0.4.1 // indirect
 	github.com/moby/sys/atomicwriter v0.1.0 // indirect
 	github.com/moby/sys/user v0.4.0 // indirect
 	github.com/moby/term v0.5.2 // indirect
@@ -198,14 +198,14 @@ require (
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.1.1 // indirect
 	github.com/opencontainers/runc v1.3.2 // indirect
-	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
+	github.com/pelletier/go-toml/v2 v2.3.1 // indirect
 	github.com/peterbourgon/ff/v3 v3.4.0 // indirect
-	github.com/petermattis/goid v0.0.0-20260113132338-7c7de50cc741 // indirect
+	github.com/petermattis/goid v0.0.0-20260330135022-df67b199bc81 // indirect
 	github.com/pires/go-proxyproto v0.9.2 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
-	github.com/prometheus/procfs v0.19.2 // indirect
+	github.com/prometheus/procfs v0.20.1 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/safchain/ethtool v0.7.0 // indirect
 	github.com/sagikazarmark/locafero v0.12.0 // indirect
@@ -220,7 +220,7 @@ require (
 	github.com/tailscale/peercred v0.0.0-20250107143737-35a0c7bd7edc // indirect
 	github.com/tailscale/setec v0.0.0-20260310221408-dcd97e42f251 // indirect
 	github.com/tailscale/web-client-prebuilt v0.0.0-20251127225136-f19339b67368 // indirect
-	github.com/tailscale/wireguard-go v0.0.0-20260427181203-e3ac4a0afb4e // indirect
+	github.com/tailscale/wireguard-go v0.0.0-20260527010701-b48af7099cad // indirect
 	github.com/toqueteos/webbrowser v1.2.0 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
@@ -228,24 +228,25 @@ require (
 	github.com/xeipuuv/gojsonschema v1.2.0 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.68.0 // indirect
-	go.opentelemetry.io/otel v1.43.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.69.0 // indirect
+	go.opentelemetry.io/otel v1.44.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.43.0 // indirect
-	go.opentelemetry.io/otel/metric v1.43.0 // indirect
-	go.opentelemetry.io/otel/trace v1.43.0 // indirect
-	go.yaml.in/yaml/v2 v2.4.3 // indirect
+	go.opentelemetry.io/otel/metric v1.44.0 // indirect
+	go.opentelemetry.io/otel/trace v1.44.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.4 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
 	go4.org/mem v0.0.0-20240501181205-ae6ca9944745 // indirect
-	golang.org/x/image v0.40.0 // indirect
+	golang.org/x/exp/typeparams v0.0.0-20260603202125-055de637280b // indirect
+	golang.org/x/image v0.41.0 // indirect
 	golang.org/x/mod v0.36.0 // indirect
-	golang.org/x/sys v0.45.0 // indirect
-	golang.org/x/term v0.43.0 // indirect
-	golang.org/x/text v0.37.0 // indirect
+	golang.org/x/sys v0.46.0 // indirect
+	golang.org/x/term v0.44.0 // indirect
+	golang.org/x/text v0.38.0 // indirect
 	golang.org/x/time v0.15.0 // indirect
 	golang.org/x/tools v0.45.0 // indirect
 	golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 // indirect
 	golang.zx2c4.com/wireguard/windows v0.5.3 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20260519071638-aa98bba5eb94 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260526163538-3dc84a4a5aaa // indirect
 	k8s.io/client-go v0.34.0 // indirect
 	sigs.k8s.io/yaml v1.6.0 // indirect
 	software.sslmate.com/src/go-pkcs12 v0.4.0 // indirect
@@ -4,8 +4,8 @@ atomicgo.dev/assert v0.0.2 h1:FiKeMiZSgRrZsPo9qn/7vmr7mCsh5SZyXY4YGYiYwrg=
 atomicgo.dev/assert v0.0.2/go.mod h1:ut4NcI3QDdJtlmAxQULOmA13Gz6e2DWbSAS8RUOmNYQ=
 atomicgo.dev/cursor v0.2.0 h1:H6XN5alUJ52FZZUkI7AlJbUc1aW38GWZalpYRPpoPOw=
 atomicgo.dev/cursor v0.2.0/go.mod h1:Lr4ZJB3U7DfPPOkbH7/6TOtJ4vFGHlgj1nc+n900IpU=
-atomicgo.dev/keyboard v0.2.9 h1:tOsIid3nlPLZ3lwgG8KZMp/SFmr7P0ssEN5JUsm78K8=
-atomicgo.dev/keyboard v0.2.9/go.mod h1:BC4w9g00XkxH/f1HXhW2sXmJFOCWbKn9xrOunSFtExQ=
+atomicgo.dev/keyboard v0.2.10 h1:v7mvUKUZLHIggxULEIuWbT+WkkyQSgdbA201EziAhHU=
+atomicgo.dev/keyboard v0.2.10/go.mod h1:ap/z5ilnhLqYq852m6kPeTq5Z6aESGWu5mzRpJlC6aI=
 atomicgo.dev/schedule v0.1.0 h1:nTthAbhZS5YZmgYbb2+DH8uQIZcTlIrd4eYr3UQxEjs=
 atomicgo.dev/schedule v0.1.0/go.mod h1:xeUa3oAkiuHYh8bKiQBRojqAMq3PXXbJujjb0hw8pEU=
 dario.cat/mergo v1.0.2 h1:85+piFYR1tMbRrLcDwR18y4UKJ3aH1Tbzi24VRW1TK8=
@@ -22,13 +22,6 @@ github.com/BurntSushi/toml v1.5.0 h1:W5quZX/G/csjUnuI8SUYlsHs9M38FC7znL0lIO+DvMg
 github.com/BurntSushi/toml v1.5.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
 github.com/Kodeworks/golang-image-ico v0.0.0-20141118225523-73f0f4cfade9 h1:1ltqoej5GtaWF8jaiA49HwsZD459jqm9YFz9ZtMFpQA=
 github.com/Kodeworks/golang-image-ico v0.0.0-20141118225523-73f0f4cfade9/go.mod h1:7uhhqiBaR4CpN0k9rMjOtjpcfGd6DG2m04zQxKnWQ0I=
-github.com/MarvinJWendt/testza v0.1.0/go.mod h1:7AxNvlfeHP7Z/hDQ5JtE3OKYT3XFUeLCDE2DQninSqs=
-github.com/MarvinJWendt/testza v0.2.1/go.mod h1:God7bhG8n6uQxwdScay+gjm9/LnO4D3kkcZX4hv9Rp8=
-github.com/MarvinJWendt/testza v0.2.8/go.mod h1:nwIcjmr0Zz+Rcwfh3/4UhBp7ePKVhuBExvZqnKYWlII=
-github.com/MarvinJWendt/testza v0.2.10/go.mod h1:pd+VWsoGUiFtq+hRKSU1Bktnn+DMCSrDrXDpX2bG66k=
-github.com/MarvinJWendt/testza v0.2.12/go.mod h1:JOIegYyV7rX+7VZ9r77L/eH6CfJHHzXjB69adAhzZkI=
-github.com/MarvinJWendt/testza v0.3.0/go.mod h1:eFcL4I0idjtIx8P9C6KkAuLgATNKpX4/2oUqKc6bF2c=
-github.com/MarvinJWendt/testza v0.4.2/go.mod h1:mSdhXiKH8sg/gQehJ63bINcCKp7RtYewEjXsvsVUPbE=
 github.com/MarvinJWendt/testza v0.5.2 h1:53KDo64C1z/h/d/stCYCPY69bt/OSwjq5KpFNwi+zB4=
 github.com/MarvinJWendt/testza v0.5.2/go.mod h1:xu53QFE5sCdjtMCKk8YMQ2MnymimEctc4n3EjyIYvEY=
 github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
@@ -43,7 +36,6 @@ github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFI
 github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
 github.com/arl/statsviz v0.8.0 h1:O6GjjVxEDxcByAucOSl29HaGYLXsuwA3ujJw8H9E7/U=
 github.com/arl/statsviz v0.8.0/go.mod h1:XlrbiT7xYT03xaW9JMMfD8KFUhBOESJwfyNJu83PbB0=
-github.com/atomicgo/cursor v0.0.1/go.mod h1:cBON2QmmrysudxNBFthvMtN32r3jxVRIvzkUiF/RuIk=
 github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4=
 github.com/atotto/clipboard v0.1.4/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
 github.com/aws/aws-sdk-go-v2 v1.41.1 h1:ABlyEARCDLN034NhxlRUSZr4l71mh+T5KAeGh6cerhU=
@@ -113,11 +105,10 @@ github.com/clipperhouse/uax29/v2 v2.7.0 h1:+gs4oBZ2gPfVrKPthwbMzWZDaAFPGYK72F0NJ
 github.com/clipperhouse/uax29/v2 v2.7.0/go.mod h1:EFJ2TJMRUaplDxHKj1qAEhCtQPW2tJSwu5BF98AuoVM=
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@@ -133,8 +124,8 @@ github.com/creachadair/command v0.2.6 h1:+d4xUSZza5nqRVVsVRf5jDbix/0uKxVqFrc30F4
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@@ -155,12 +146,12 @@ github.com/distribution/reference v0.6.0 h1:0IXCQ5g4/QMHHkarYzh5l+u8T3t73zM5Qvfr
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@@ -186,18 +177,18 @@ github.com/glebarez/go-sqlite v1.22.0 h1:uAcMJhaA6r3LHMTFgP0SifzgXg46yJkgxqyuyec
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@@ -209,6 +200,8 @@ github.com/go-sql-driver/mysql v1.8.1 h1:LedoTUt/eveggdHS9qUFC1EFSa8bU2+1pZjSRpv
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@@ -242,26 +235,22 @@ github.com/google/nftables v0.2.1-0.20240414091927-5e242ec57806 h1:wG8RYIyctLhdF
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@@ -382,13 +364,13 @@ github.com/opencontainers/runc v1.3.2/go.mod h1:F7UQQEsxcjUNnFpT1qPLHZBKYP7yWwk6
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@@ -427,7 +402,6 @@ github.com/realclientip/realclientip-go v1.0.0 h1:+yPxeC0mEaJzq1BfCt2h4BxlyrvIIB
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@@ -441,9 +415,8 @@ github.com/samber/lo v1.53.0 h1:t975lj2py4kJPQ6haz1QMgtId2gtmfktACxIXArw3HM=
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@@ -464,8 +437,6 @@ github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSS
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@@ -491,14 +462,14 @@ github.com/tailscale/setec v0.0.0-20260310221408-dcd97e42f251 h1:kNnJlwxSzue+VRJ
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-github.com/tailscale/wireguard-go v0.0.0-20260427181203-e3ac4a0afb4e/go.mod h1:6SerzcvHWQchKO2BfNdmquA77CHSECZuFl+D9fp4RnI=
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 github.com/tc-hib/winres v0.2.1 h1:YDE0FiP0VmtRaDn7+aaChp1KiF4owBiJa5l964l5ujA=
@@ -524,34 +495,33 @@ github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 h1:EzJWgHo
 github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415/go.mod h1:GwrjFmJcFw6At/Gs6z4yjiIwzuJ1/+UwLxMQDVQXShQ=
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-github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778/go.mod h1:2MuV+tbUrU1zIOPMxZ5EncGwgmMJsa+9ucAQZXxsObs=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e h1:JVG44RsyaB9T2KIHavMF/ppJZNG9ZpyihvCd0w101no=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJuqunuUZ/Dhy/avygyECGrLceyNeo4LiM=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
 go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
-go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.68.0 h1:CqXxU8VOmDefoh0+ztfGaymYbhdB/tT3zs79QaZTNGY=
-go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.68.0/go.mod h1:BuhAPThV8PBHBvg8ZzZ/Ok3idOdhWIodywz2xEcRbJo=
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 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.43.0 h1:3iZJKlCZufyRzPzlQhUIWVmfltrXuGyfjREgGP3UUjc=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.43.0/go.mod h1:/G+nUPfhq2e+qiXMGxMwumDrP5jtzU+mWN7/sjT2rak=
-go.opentelemetry.io/otel/metric v1.43.0 h1:d7638QeInOnuwOONPp4JAOGfbCEpYb+K6DVWvdxGzgM=
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 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
-go.yaml.in/yaml/v2 v2.4.3 h1:6gvOSjQoTB3vt1l+CU+tSyi/HOjfOjRLJ4YwYZGwRO0=
-go.yaml.in/yaml/v2 v2.4.3/go.mod h1:zSxWcmIDjOzPXpjlTTbAsKokqkDNAVtZO0WOMiT90s8=
+go.yaml.in/yaml/v2 v2.4.4 h1:tuyd0P+2Ont/d6e2rl3be67goVK4R6deVxCUX5vyPaQ=
+go.yaml.in/yaml/v2 v2.4.4/go.mod h1:gMZqIpDtDqOfM0uNfy0SkpRhvUryYH0Z6wdMYcacYXQ=
 go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
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@@ -561,14 +531,14 @@ go4.org/netipx v0.0.0-20231129151722-fdeea329fbba/go.mod h1:PLyyIXexvUFg3Owu6p/W
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU=
-golang.org/x/crypto v0.52.0 h1:RMs7fP2rXdep0CftQlK8Uf+kibLm7qkCcradZWYz988=
-golang.org/x/crypto v0.52.0/go.mod h1:1QgfPxDqh0T2M/elOJtp9RvuR95kVjir0e6/BvEmGbc=
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-golang.org/x/exp v0.0.0-20260508232706-74f9aab9d74a/go.mod h1:d2fgXJLVs4dYDHUk5lwMIfzRzSrWCfGZb0ZqeLa/Vcw=
-golang.org/x/exp/typeparams v0.0.0-20240314144324-c7f7c6466f7f h1:phY1HzDcf18Aq9A8KkmRtY9WvOFIxN8wgfvy6Zm1DV8=
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-golang.org/x/image v0.40.0 h1:Tw4GyDXMo+daZN1znreBRC3VayR1aLFUyUEOLUdW1a8=
-golang.org/x/image v0.40.0/go.mod h1:uIc348UZMSvS5Z65CVZ7iDPaNobNFEPeJ4kbqTOszmA=
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@@ -578,26 +548,22 @@ golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
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-golang.org/x/net v0.55.0 h1:bcvxaJn3e1U6InsFWt1JUq1aSjnRxLzT2rtD2KfkDF8=
-golang.org/x/net v0.55.0/go.mod h1:L5U2KuzuOe1lY7Z+aWVIKK6qEeJXnXV9yzGA+WCHJww=
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-golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
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@@ -605,25 +571,23 @@ golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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-golang.org/x/sys v0.45.0 h1:dO4czNzziLiiXplLQgBCEpCvXQ3dnkn0SdaZSYdQ+FY=
-golang.org/x/sys v0.45.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
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-golang.org/x/term v0.43.0/go.mod h1:lrhlHNdQJHO+1qVYiHfFKVuVioJIheAc3fBSMFYEIsk=
+golang.org/x/term v0.44.0 h1:0rLvDRCtNj0gZkyIXhCyOb2OAzEhLVqc4B+hrsBhrmc=
+golang.org/x/term v0.44.0/go.mod h1:7ze4MdzUzLXpSAoFP1H0bOI9aXDqveSvatT5vKcFh2Y=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
-golang.org/x/text v0.37.0 h1:Cqjiwd9eSg8e0QAkyCaQTNHFIIzWtidPahFWR83rTrc=
-golang.org/x/text v0.37.0/go.mod h1:a5sjxXGs9hsn/AJVwuElvCAo9v8QYLzvavO5z2PiM38=
+golang.org/x/text v0.38.0 h1:sXmwo9DwP3OK9EZ7PqAdaooSGozfl/3a6/xJcbzPRhE=
+golang.org/x/text v0.38.0/go.mod h1:YXZt3QhHUKYT53r2lLKFIVi6Ao1jdzrTR/KQ09qyxF4=
 golang.org/x/time v0.15.0 h1:bbrp8t3bGUeFOx08pvsMYRTCVSMk89u4tKbNOZbp88U=
 golang.org/x/time v0.15.0/go.mod h1:Y4YMaQmXwGQZoFaVFk4YpCt4FLQMYKZe9oeV/f4MSno=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
@@ -639,25 +603,21 @@ golang.zx2c4.com/wireguard/windows v0.5.3 h1:On6j2Rpn3OEMXqBq00QEDC7bWSZrPIHKIus
 golang.zx2c4.com/wireguard/windows v0.5.3/go.mod h1:9TEe8TJmtwyQebdFwAkEWOPr3prrtqm+REGFifP60hI=
 gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
 gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
-google.golang.org/genproto/googleapis/api v0.0.0-20260519071638-aa98bba5eb94 h1:DddG61lE5LkX6144z22i0gma9BMBs5aZ9B8lZLobxyw=
-google.golang.org/genproto/googleapis/api v0.0.0-20260519071638-aa98bba5eb94/go.mod h1:1dCETSCY2YKZNXQE3h4fun3TYwF5p8jejRKZgfWAgAY=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20260519071638-aa98bba5eb94 h1:eZCjr/aAF8c5ccm5pb6T4EXgIei5MlAAPWPJk+5ArfY=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20260519071638-aa98bba5eb94/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
+google.golang.org/genproto/googleapis/api v0.0.0-20260610212136-7ab31c22f7ad h1:3iLyITS/sySRwbUKoC7ogfj2Yr1Cjs0pfaRKj5U5HEw=
+google.golang.org/genproto/googleapis/api v0.0.0-20260610212136-7ab31c22f7ad/go.mod h1:KdNqO+rCIWgFumrNBSEDlDNrkrQnpkax7Tv1WxNY8V4=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260526163538-3dc84a4a5aaa h1:mZHHdPZl0dbGHCflZgAq/Q468DWVFcU2whhB2KAo8fk=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260526163538-3dc84a4a5aaa/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
 google.golang.org/grpc v1.81.1 h1:VnnIIZ88UzOOKLukQi+ImGz8O1Wdp8nAGGnvOfEIWQQ=
 google.golang.org/grpc v1.81.1/go.mod h1:xGH9GfzOyMTGIOXBJmXt+BX/V0kcdQbdcuwQ/zNw42I=
 google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
 google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gorm.io/driver/postgres v1.6.0 h1:2dxzU8xJ+ivvqTRph34QX+WrRaJlmfyPqXmoGVjMBa4=
@@ -696,8 +656,8 @@ modernc.org/opt v0.2.0 h1:tGyef5ApycA7FSEOMraay9SaTk5zmbx7Tu+cJs4QKZg=
 modernc.org/opt v0.2.0/go.mod h1:03fq9lsNfvkYSfxrfUhZCWPk1lm4cq4N+Bh//bEtgns=
 modernc.org/sortutil v1.2.1 h1:+xyoGf15mM3NMlPDnFqrteY07klSFxLElE2PVuWIJ7w=
 modernc.org/sortutil v1.2.1/go.mod h1:7ZI3a3REbai7gzCLcotuw9AC4VZVpYMjDzETGsSMqJE=
-modernc.org/sqlite v1.50.1 h1:l+cQvn0sd0zJJtfygGHuQJ5AjlrwXmWPw4KP3ZMwr9w=
-modernc.org/sqlite v1.50.1/go.mod h1:tcNzv5p84E0skkmJn038y+hWJbLQXQqEnQfeh5r2JLM=
+modernc.org/sqlite v1.52.0 h1:p4dhYh2tXZCiyaqHwRVJDjIGKWyXayiQpThxgDzJaxo=
+modernc.org/sqlite v1.52.0/go.mod h1:tcNzv5p84E0skkmJn038y+hWJbLQXQqEnQfeh5r2JLM=
 modernc.org/strutil v1.2.1 h1:UneZBkQA+DX2Rp35KcM69cSsNES9ly8mQWD71HKlOA0=
 modernc.org/strutil v1.2.1/go.mod h1:EHkiggD70koQxjVdSBM3JKM7k6L0FbGE5eymy9i3B9A=
 modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=
@@ -708,7 +668,7 @@ sigs.k8s.io/yaml v1.6.0 h1:G8fkbMSAFqgEFgh4b1wmtzDnioxFCUgTZhlbj5P9QYs=
 sigs.k8s.io/yaml v1.6.0/go.mod h1:796bPqUfzR/0jLAl6XjHl3Ck7MiyVv8dbTdyT3/pMf4=
 software.sslmate.com/src/go-pkcs12 v0.4.0 h1:H2g08FrTvSFKUj+D309j1DPfk5APnIdAQAB8aEykJ5k=
 software.sslmate.com/src/go-pkcs12 v0.4.0/go.mod h1:Qiz0EyvDRJjjxGyUQa2cCNZn/wMyzrRJ/qcDXOQazLI=
-tailscale.com v1.98.3 h1:caAbG4UfkKfKPE6b1fj5t4ep5qrwEis5AJu91ruvePw=
-tailscale.com v1.98.3/go.mod h1:U23ZwbZlKJMNU7CScy+lCVVlece/S5n09q0nyudncBI=
+tailscale.com v1.101.0-pre h1:q1eBWxryj7Lz5fMvi7npSbN/fJ3q6/crvbbfMkx89F8=
+tailscale.com v1.101.0-pre/go.mod h1:DQ9YBy85DpNlSyeU2XRIWzbAu3RsGp/frv+Khg57meE=
 zombiezen.com/go/postgrestest v1.0.1 h1:aXoADQAJmZDU3+xilYVut0pHhgc0sF8ZspPW9gFNwP4=
 zombiezen.com/go/postgrestest v1.0.1/go.mod h1:marlZezr+k2oSJrvXHnZUs1olHqpE9czlz8ZYkVxliQ=
@@ -377,7 +377,7 @@ func (h *Headscale) scheduledTasks(ctx context.Context) {
 				continue
 			}

-			h.cfg.TailcfgDNSConfig.ExtraRecords = records
+			h.cfg.SetExtraRecords(records)

 			h.Change(change.ExtraRecords())

@@ -544,6 +544,11 @@ func (h *Headscale) createRouter(grpcMux *grpcRuntime.ServeMux) *chi.Mux {
 	r.Use(middleware.Recoverer)
 	r.Use(securityHeaders)

+	// TS2021 accepts both the native client's HTTP POST upgrade and the
+	// browser/WASM client's WebSocket GET upgrade; NoiseUpgradeHandler
+	// dispatches on the Upgrade header, not the method. Registering GET as
+	// well keeps the router from rejecting the WebSocket handshake with 405.
+	r.Get(ts2021UpgradePath, h.NoiseUpgradeHandler)
 	r.Post(ts2021UpgradePath, h.NoiseUpgradeHandler)

 	r.Get("/robots.txt", h.RobotsHandler)
@@ -667,7 +672,7 @@ func (h *Headscale) Serve() error {
 			return fmt.Errorf("setting up extrarecord manager: %w", err)
 		}

-		h.cfg.TailcfgDNSConfig.ExtraRecords = h.extraRecordMan.Records()
+		h.cfg.SetExtraRecords(h.extraRecordMan.Records())

 		go h.extraRecordMan.Run()
 		defer h.extraRecordMan.Close()
@@ -23,6 +23,18 @@ type AuthProvider interface {
 	AuthURL(authID types.AuthID) string
 }

+// machineKeyMismatch fails closed when a node looked up by NodeKey was started
+// in a Noise session with a different machine key. Without this anyone holding a
+// target's NodeKey could open a session with a throwaway machine key and act on
+// the owner's node. Returns a 401 [HTTPError] on mismatch, nil otherwise.
+func machineKeyMismatch(node types.NodeView, machineKey key.MachinePublic) error {
+	if node.MachineKey() != machineKey {
+		return NewHTTPError(http.StatusUnauthorized, "node exists with a different machine key", nil)
+	}
+
+	return nil
+}
+
 func (h *Headscale) handleRegister(
 	ctx context.Context,
 	req tailcfg.RegisterRequest,
@@ -223,9 +235,32 @@ func (h *Headscale) handleLogout(
 			Msg("Node is not ephemeral, setting expiry instead of deleting")
 	}

+	// Tagged nodes have key expiry permanently disabled (they are owned by
+	// their tags, not a user, and never expire - KB 1068). Logging one out has
+	// no expiry semantics, so do not stamp an expiry on it: doing so leaves the
+	// node IsExpired() forever and it can never re-authenticate (#3371). The
+	// admin path `headscale nodes expire` remains free to set a deliberate
+	// expiry via SetNodeExpiry; only the logout path is guarded here.
+	if node.IsTagged() {
+		log.Debug().
+			EmbedObject(node).
+			Msg("Tagged node logout: not stamping expiry (tagged nodes never expire)")
+
+		return nodeToRegisterResponse(node), nil
+	}
+
 	// Update the internal state with the nodes new expiry, meaning it is
 	// logged out.
+	//
+	// Clamp the client-supplied value to now: Tailscale sends the
+	// sentinel time.Unix(123, 0) on logout (controlclient/direct.go),
+	// and storing it verbatim propagates a 1970 KeyExpiry to every
+	// peer's netmap. Semantically identical (expired as of now), but
+	// sane in logs, debug dumps, and peer netmaps.
 	expiry := req.Expiry
+	if now := time.Now(); expiry.Before(now) {
+		expiry = now
+	}

 	updatedNode, c, err := h.state.SetNodeExpiry(node.ID(), &expiry)
 	if err != nil {
@@ -282,19 +317,41 @@ func (h *Headscale) waitForFollowup(
 	}

 	if reg, ok := h.state.GetAuthCacheEntry(followupReg); ok {
+		var verdict types.AuthVerdict
 		select {
-		case <-ctx.Done():
-			return nil, NewHTTPError(http.StatusUnauthorized, "registration timed out", err)
-		case verdict := <-reg.WaitForAuth():
-			if verdict.Accept() {
-				if !verdict.Node.Valid() {
-					// registration is expired in the cache, instruct the client to try a new registration
-					return h.reqToNewRegisterResponse(req, machineKey)
-				}
-
-				return nodeToRegisterResponse(verdict.Node), nil
+		// Prefer a completed registration even if the context has also
+		// expired. When both are ready, a plain select picks at random and
+		// would discard a successful registration as a spurious timeout
+		// (issue #3385).
+		case verdict = <-reg.WaitForAuth():
+		default:
+			select {
+			case <-ctx.Done():
+				return nil, NewHTTPError(http.StatusUnauthorized, "registration timed out", ctx.Err())
+			case verdict = <-reg.WaitForAuth():
 			}
 		}
+
+		if verdict.Accept() {
+			if !verdict.Node.Valid() {
+				// registration is expired in the cache, instruct the client to try a new registration
+				return h.reqToNewRegisterResponse(req, machineKey)
+			}
+
+			// The followup poll is only authenticated by the auth ID in the
+			// URL, so fail closed unless the Noise session asking for the
+			// result was started with the same machine key that opened the
+			// registration. [State.HandleNodeFromAuthPath] resolves the node
+			// from the cached [types.RegistrationData.MachineKey], so the two
+			// match on the normal path. [Headscale.handleRegister] and
+			// [Headscale.handleLogout] apply the same check.
+			err := machineKeyMismatch(verdict.Node, machineKey)
+			if err != nil {
+				return nil, err
+			}
+
+			return nodeToRegisterResponse(verdict.Node), nil
+		}
 	}

 	// if the follow-up registration isn't found anymore, instruct the client to try a new registration
@@ -1008,16 +1008,24 @@ func TestReAuthWithDifferentMachineKey(t *testing.T) {
 		Expiry: time.Now().Add(24 * time.Hour),
 	}

-	resp2, err := app.handleRegisterWithAuthKey(regReq2, machineKey2.Public())
-	require.NoError(t, err)
-	require.True(t, resp2.MachineAuthorized)
+	// A NodeKey is bound 1:1 to a MachineKey (getAndValidateNode enforces
+	// this at poll time). A different machine claiming an existing NodeKey is
+	// a hijack: it would poison the NodeStore NodeKey index so the original
+	// node fails the poll-time MachineKey check and is denied service.
+	// Registration now rejects it (see f8f08cf7). Real Tailscale clients
+	// never reuse a NodeKey across machine keys, so no legitimate flow is
+	// affected.
+	_, err = app.handleRegisterWithAuthKey(regReq2, machineKey2.Public())
+	require.Error(t, err,
+		"a different machine claiming an existing NodeKey must be rejected")

-	// Verify the node still exists and has tags
-	// Note: Depending on implementation, this might be the same node or a new node
+	// The original node is unaffected: still present, tagged, same identity.
 	node2, found := app.state.GetNodeByNodeKey(nodeKey.Public())
 	require.True(t, found)
 	assert.True(t, node2.IsTagged())
 	assert.ElementsMatch(t, tags, node2.Tags().AsSlice())
+	assert.Equal(t, node1.ID(), node2.ID(),
+		"original node must survive; the hijacking registration was rejected")
 }

 // TestUntaggedAuthKeyZeroExpiryGetsDefault tests that when node.expiry is configured
@@ -1330,3 +1338,392 @@ func TestReregistrationZeroExpiryStaysNil(t *testing.T) {
 	assert.False(t, node2.Expiry().Valid(),
 		"re-registration with zero client expiry and no default should leave expiry nil, not pointer to zero time")
 }
+
+// tsLogoutSentinelExpiry is the past expiry a real tailscale client sends on
+// `tailscale logout`: time.Unix(123, 0) (controlclient/direct.go). The issue
+// #3371 trace shows it verbatim as `expiry=123`. Using it here (rather than a
+// generic time.Now().Add(-1h)) keeps the reproduction faithful to the wire
+// behaviour: handleRegister must classify this as a logout, and handleLogout
+// must clamp it to now.
+func tsLogoutSentinelExpiry() time.Time {
+	return time.Unix(123, 0)
+}
+
+// TestIssue3371_TaggedNodeLogoutReloginSingleUseKey reproduces
+// https://github.com/juanfont/headscale/issues/3371 through the real
+// register/logout HTTP-handler path (handleRegister -> handleLogout ->
+// handleRegister), not by poking SetNodeExpiry directly.
+//
+// Root cause (a): `tailscale logout` sends a past expiry; handleLogout stamps
+// it on the node via SetNodeExpiry with no IsTagged guard, so a tagged node —
+// which must have key-expiry disabled — becomes Expired.
+//
+// Root cause (b): on the next `tailscale up --auth-key <fresh key>`,
+// HandleNodeFromPreAuthKey sees an expired node, takes the expired-node
+// validation path, consumes the fresh single-use key on the in-place
+// re-registration, yet leaves the node expired (the expiry-refresh block is
+// gated `!node.IsTagged()`). The response carries NodeKeyExpired=true, so the
+// client rotates its node key and retries with the now-spent key, which is
+// rejected with "authkey already used" forever.
+//
+// Faithful to the artifacts: the client rotates its NodeKey on relogin, the
+// logout carries BOTH a past expiry AND an auth key, and a BRAND NEW key is
+// presented for the relogin (the trace shows tag:tag2 keys burned while the
+// node kept tag:tag1).
+func TestIssue3371_TaggedNodeLogoutReloginSingleUseKey(t *testing.T) {
+	app := createTestApp(t)
+
+	user := app.state.CreateUserForTest("tag-logout-user")
+	tags := []string{"tag:tag1"}
+
+	// `headscale preauthkeys create --tags tag:tag1` (single-use).
+	pak, err := app.state.CreatePreAuthKey(user.TypedID(), false, false, nil, tags)
+	require.NoError(t, err)
+
+	machineKey := key.NewMachine()
+	nodeKey := key.NewNode()
+
+	// `tailscale up --auth-key $KEY1`: initial join.
+	regReq := tailcfg.RegisterRequest{
+		Auth:     &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey:  nodeKey.Public(),
+		Hostinfo: &tailcfg.Hostinfo{Hostname: "headscale-debug"},
+	}
+
+	resp, err := app.handleRegister(context.Background(), regReq, machineKey.Public())
+	require.NoError(t, err)
+	require.True(t, resp.MachineAuthorized)
+	require.False(t, resp.NodeKeyExpired)
+
+	node, found := app.state.GetNodeByNodeKey(nodeKey.Public())
+	require.True(t, found)
+	require.True(t, node.IsTagged(), "precondition: node is tagged")
+	require.False(t, node.Expiry().Valid(), "precondition: tagged node has expiry disabled")
+
+	// `tailscale logout`: client sends a past-expiry register with the auth key
+	// still attached (handleRegister must treat past expiry as logout regardless
+	// of Auth). Reuse the same node key: logout does not rotate it.
+	logoutReq := tailcfg.RegisterRequest{
+		Auth:    &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey: nodeKey.Public(),
+		Expiry:  tsLogoutSentinelExpiry(),
+	}
+
+	_, err = app.handleRegister(context.Background(), logoutReq, machineKey.Public())
+	require.NoError(t, err)
+
+	// A tagged node must NOT be expired by logout — tagged nodes never expire.
+	// This is root cause (a); it fails before the fix.
+	nodeAfterLogout, found := app.state.GetNodeByNodeKey(nodeKey.Public())
+	require.True(t, found)
+	assert.False(t, nodeAfterLogout.IsExpired(),
+		"issue #3371 root cause (a): logout must not expire a tagged node")
+	assert.False(t, nodeAfterLogout.Expiry().Valid(),
+		"issue #3371 root cause (a): tagged node must keep key-expiry disabled after logout")
+
+	// `tailscale up --auth-key $KEY2`: a BRAND NEW single-use key, and the client
+	// rotates its node key (as the real client does on relogin).
+	pak2, err := app.state.CreatePreAuthKey(user.TypedID(), false, false, nil, tags)
+	require.NoError(t, err)
+
+	nodeKey2 := key.NewNode()
+	reloginReq := tailcfg.RegisterRequest{
+		Auth:     &tailcfg.RegisterResponseAuth{AuthKey: pak2.Key},
+		NodeKey:  nodeKey2.Public(),
+		Hostinfo: &tailcfg.Hostinfo{Hostname: "headscale-debug"},
+	}
+
+	reloginResp, err := app.handleRegister(context.Background(), reloginReq, machineKey.Public())
+	require.NoError(t, err,
+		"issue #3371: a fresh valid key must re-authenticate the tagged node after logout")
+	require.NotNil(t, reloginResp)
+
+	// The whole point: the node comes back online, not stuck expired.
+	assert.False(t, reloginResp.NodeKeyExpired,
+		"issue #3371: relogin response must not report the node key as expired")
+	assert.True(t, reloginResp.MachineAuthorized)
+
+	relogged, found := app.state.GetNodeByNodeKey(nodeKey2.Public())
+	require.True(t, found)
+	assert.True(t, relogged.IsTagged(), "node stays tagged after relogin")
+	assert.False(t, relogged.IsExpired(),
+		"issue #3371: tagged node must be online (not expired) after relogin")
+	assert.False(t, relogged.Expiry().Valid(),
+		"issue #3371: tagged node must have key-expiry disabled after relogin")
+	assert.Equal(t, node.ID(), relogged.ID(), "must re-use the same node, not duplicate")
+	assert.Equal(t, 1, app.state.ListNodes().Len(), "machine maps to exactly one node")
+}
+
+// TestIssue3371_TaggedNodeLogoutReloginReusableKey is the reusable-key variant
+// from the issue ("tailscale up then hangs indefinitely instead of erroring").
+// With a reusable key the relogin does not hit "authkey already used", but the
+// node still stays expired without the fix — so the client never observes a
+// non-expired node and hangs. The observable failure here is the persisted
+// expired state after relogin.
+func TestIssue3371_TaggedNodeLogoutReloginReusableKey(t *testing.T) {
+	app := createTestApp(t)
+
+	user := app.state.CreateUserForTest("tag-logout-reusable")
+	tags := []string{"tag:tag1"}
+
+	// `headscale preauthkeys create --reusable --tags tag:tag1`.
+	pak, err := app.state.CreatePreAuthKey(user.TypedID(), true, false, nil, tags)
+	require.NoError(t, err)
+
+	machineKey := key.NewMachine()
+	nodeKey := key.NewNode()
+
+	regReq := tailcfg.RegisterRequest{
+		Auth:     &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey:  nodeKey.Public(),
+		Hostinfo: &tailcfg.Hostinfo{Hostname: "reusable-tagged"},
+	}
+
+	_, err = app.handleRegister(context.Background(), regReq, machineKey.Public())
+	require.NoError(t, err)
+
+	node, found := app.state.GetNodeByNodeKey(nodeKey.Public())
+	require.True(t, found)
+	require.True(t, node.IsTagged())
+	require.False(t, node.Expiry().Valid())
+
+	// Logout.
+	logoutReq := tailcfg.RegisterRequest{
+		Auth:    &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey: nodeKey.Public(),
+		Expiry:  tsLogoutSentinelExpiry(),
+	}
+	_, err = app.handleRegister(context.Background(), logoutReq, machineKey.Public())
+	require.NoError(t, err)
+
+	// Relogin with the same reusable key, rotating the node key.
+	nodeKey2 := key.NewNode()
+	reloginReq := tailcfg.RegisterRequest{
+		Auth:     &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey:  nodeKey2.Public(),
+		Hostinfo: &tailcfg.Hostinfo{Hostname: "reusable-tagged"},
+	}
+	reloginResp, err := app.handleRegister(context.Background(), reloginReq, machineKey.Public())
+	require.NoError(t, err)
+	require.NotNil(t, reloginResp)
+
+	assert.False(t, reloginResp.NodeKeyExpired,
+		"issue #3371: reusable-key relogin must not report node key expired")
+
+	relogged, found := app.state.GetNodeByNodeKey(nodeKey2.Public())
+	require.True(t, found)
+	assert.True(t, relogged.IsTagged())
+	assert.False(t, relogged.IsExpired(),
+		"issue #3371: tagged node must be online (not expired) after reusable-key relogin")
+	assert.False(t, relogged.Expiry().Valid(),
+		"issue #3371: tagged node must have key-expiry disabled after reusable-key relogin")
+}
+
+// TestIssue3371_TaggedNodeLogoutDoesNotSetExpiry pins the deepest root cause
+// (a) in isolation: `tailscale logout` on a tagged node must not stamp an
+// expiry at all. This is the assertion PR #3372 does not make — it leaves
+// handleLogout expiring tagged nodes and only unwinds the damage on the next
+// registration. Keeping this separate from the relogin tests means a
+// regression that re-introduces logout-sets-expiry is caught even if the
+// re-registration cleanup masks it.
+func TestIssue3371_TaggedNodeLogoutDoesNotSetExpiry(t *testing.T) {
+	app := createTestApp(t)
+
+	user := app.state.CreateUserForTest("tag-logout-noexpiry")
+	tags := []string{"tag:tag1"}
+
+	pak, err := app.state.CreatePreAuthKey(user.TypedID(), true, false, nil, tags)
+	require.NoError(t, err)
+
+	machineKey := key.NewMachine()
+	nodeKey := key.NewNode()
+
+	regReq := tailcfg.RegisterRequest{
+		Auth:     &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey:  nodeKey.Public(),
+		Hostinfo: &tailcfg.Hostinfo{Hostname: "noexpiry-tagged"},
+	}
+	_, err = app.handleRegister(context.Background(), regReq, machineKey.Public())
+	require.NoError(t, err)
+
+	logoutReq := tailcfg.RegisterRequest{
+		Auth:    &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey: nodeKey.Public(),
+		Expiry:  tsLogoutSentinelExpiry(),
+	}
+	_, err = app.handleRegister(context.Background(), logoutReq, machineKey.Public())
+	require.NoError(t, err)
+
+	nodeAfterLogout, found := app.state.GetNodeByNodeKey(nodeKey.Public())
+	require.True(t, found)
+	assert.True(t, nodeAfterLogout.IsTagged(), "node stays tagged through logout")
+	assert.False(t, nodeAfterLogout.Expiry().Valid(),
+		"issue #3371 root cause (a): logout must not set an expiry on a tagged node")
+	assert.False(t, nodeAfterLogout.IsExpired(),
+		"issue #3371 root cause (a): tagged node must not be expired by logout")
+
+	// The database column must be NULL, not a clamped 'now' timestamp — a
+	// persisted expiry survives restart and re-triggers the lockout.
+	var dbNode types.Node
+	require.NoError(t,
+		app.state.DB().DB.First(&dbNode, nodeAfterLogout.ID().Uint64()).Error)
+	assert.Nil(t, dbNode.Expiry,
+		"issue #3371 root cause (a): tagged node's DB expiry must remain NULL after logout")
+}
+
+// TestIssue3371_UserOwnedNodeLogoutStillExpires is the guard rail: the fix for
+// tagged nodes must not change logout for ordinary user-owned nodes. A
+// user-owned node that logs out MUST still be expired (that is what logout
+// means for it).
+func TestIssue3371_UserOwnedNodeLogoutStillExpires(t *testing.T) {
+	app := createTestApp(t)
+
+	user := app.state.CreateUserForTest("user-logout")
+
+	pak, err := app.state.CreatePreAuthKey(user.TypedID(), true, false, nil, nil)
+	require.NoError(t, err)
+
+	machineKey := key.NewMachine()
+	nodeKey := key.NewNode()
+
+	regReq := tailcfg.RegisterRequest{
+		Auth:     &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey:  nodeKey.Public(),
+		Hostinfo: &tailcfg.Hostinfo{Hostname: "user-node"},
+		Expiry:   time.Now().Add(24 * time.Hour),
+	}
+	_, err = app.handleRegister(context.Background(), regReq, machineKey.Public())
+	require.NoError(t, err)
+
+	node, found := app.state.GetNodeByNodeKey(nodeKey.Public())
+	require.True(t, found)
+	require.False(t, node.IsTagged(), "precondition: user-owned node")
+
+	logoutReq := tailcfg.RegisterRequest{
+		Auth:    &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey: nodeKey.Public(),
+		Expiry:  tsLogoutSentinelExpiry(),
+	}
+	logoutResp, err := app.handleRegister(context.Background(), logoutReq, machineKey.Public())
+	require.NoError(t, err)
+	require.NotNil(t, logoutResp)
+
+	nodeAfterLogout, found := app.state.GetNodeByNodeKey(nodeKey.Public())
+	require.True(t, found)
+	assert.True(t, nodeAfterLogout.IsExpired(),
+		"user-owned node must still be expired by logout (fix must not regress this)")
+	assert.True(t, logoutResp.NodeKeyExpired,
+		"logout response for a user-owned node must report the key expired")
+}
+
+// TestIssue3371_TaggedNodeFutureExpirySurvivesRelogin is the discriminator
+// guard rail for the fix. A tagged node may carry a DELIBERATE future expiry
+// set by an admin (`headscale nodes expire`); TestTaggedNodeCanHaveKeyExpiry
+// establishes that is legal. The #3371 fix clears only a STALE PAST expiry (the
+// logout stamp) on re-registration — it must NOT wipe a future expiry. This
+// test locks that boundary: without care, a "tagged => clear expiry" fix would
+// silently destroy the admin's setting.
+//
+// Passes before the fix (re-registration currently never touches a tagged
+// node's expiry) and must keep passing after.
+func TestIssue3371_TaggedNodeFutureExpirySurvivesRelogin(t *testing.T) {
+	app := createTestApp(t)
+
+	user := app.state.CreateUserForTest("tag-future-expiry")
+	tags := []string{"tag:tag1"}
+
+	pak, err := app.state.CreatePreAuthKey(user.TypedID(), true, false, nil, tags)
+	require.NoError(t, err)
+
+	machineKey := key.NewMachine()
+	nodeKey := key.NewNode()
+
+	regReq := tailcfg.RegisterRequest{
+		Auth:     &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey:  nodeKey.Public(),
+		Hostinfo: &tailcfg.Hostinfo{Hostname: "future-expiry-tagged"},
+	}
+	_, err = app.handleRegister(context.Background(), regReq, machineKey.Public())
+	require.NoError(t, err)
+
+	node, found := app.state.GetNodeByNodeKey(nodeKey.Public())
+	require.True(t, found)
+	require.True(t, node.IsTagged())
+
+	// Admin sets a deliberate future expiry (`headscale nodes expire`).
+	future := time.Now().Add(24 * time.Hour)
+	_, _, err = app.state.SetNodeExpiry(node.ID(), &future)
+	require.NoError(t, err)
+
+	withFuture, found := app.state.GetNodeByNodeKey(nodeKey.Public())
+	require.True(t, found)
+	require.True(t, withFuture.Expiry().Valid(), "precondition: future expiry set")
+	require.False(t, withFuture.IsExpired(), "precondition: future expiry is not expired")
+
+	// Node re-registers (rotating its node key). The future expiry must survive.
+	nodeKey2 := key.NewNode()
+	reregReq := tailcfg.RegisterRequest{
+		Auth:     &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey:  nodeKey2.Public(),
+		Hostinfo: &tailcfg.Hostinfo{Hostname: "future-expiry-tagged"},
+	}
+	_, err = app.handleRegister(context.Background(), reregReq, machineKey.Public())
+	require.NoError(t, err)
+
+	after, found := app.state.GetNodeByNodeKey(nodeKey2.Public())
+	require.True(t, found)
+	require.True(t, after.IsTagged(), "node stays tagged")
+	assert.True(t, after.Expiry().Valid(),
+		"deliberate future expiry must survive re-registration (not cleared by #3371 fix)")
+	assert.WithinDuration(t, future, after.Expiry().Get(), 5*time.Second,
+		"the surviving expiry must be the admin-set future value, unchanged")
+}
+
+// TestIssue3371_EphemeralTaggedNodeLogoutDeletes is a regression guard for the
+// ephemeral+tagged combination. A tagged pre-auth key can also be ephemeral.
+// handleLogout deletes ephemeral nodes (before any expiry stamp), so the #3371
+// fix (which suppresses the expiry stamp for tagged nodes) must not divert an
+// ephemeral tagged node away from deletion.
+//
+// Passes before the fix and must keep passing after.
+func TestIssue3371_EphemeralTaggedNodeLogoutDeletes(t *testing.T) {
+	app := createTestApp(t)
+
+	user := app.state.CreateUserForTest("tag-ephemeral")
+	tags := []string{"tag:tag1"}
+
+	// Ephemeral + tagged key.
+	pak, err := app.state.CreatePreAuthKey(user.TypedID(), true, true, nil, tags)
+	require.NoError(t, err)
+
+	machineKey := key.NewMachine()
+	nodeKey := key.NewNode()
+
+	regReq := tailcfg.RegisterRequest{
+		Auth:     &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey:  nodeKey.Public(),
+		Hostinfo: &tailcfg.Hostinfo{Hostname: "ephemeral-tagged"},
+	}
+	_, err = app.handleRegister(context.Background(), regReq, machineKey.Public())
+	require.NoError(t, err)
+
+	node, found := app.state.GetNodeByNodeKey(nodeKey.Public())
+	require.True(t, found)
+	require.True(t, node.IsTagged(), "precondition: node is tagged")
+	require.True(t, node.IsEphemeral(), "precondition: node is ephemeral")
+
+	// Logout: an ephemeral node is deleted, not expired.
+	logoutReq := tailcfg.RegisterRequest{
+		Auth:    &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey: nodeKey.Public(),
+		Expiry:  tsLogoutSentinelExpiry(),
+	}
+	_, err = app.handleRegister(context.Background(), logoutReq, machineKey.Public())
+	require.NoError(t, err)
+
+	require.EventuallyWithT(t, func(c *assert.CollectT) {
+		_, stillThere := app.state.GetNodeByNodeKey(nodeKey.Public())
+		assert.False(c, stillThere,
+			"ephemeral tagged node must be deleted on logout, not expired")
+	}, 2*time.Second, 50*time.Millisecond, "waiting for ephemeral node deletion")
+}
@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"net/http"
 	"net/url"
 	"strings"
 	"testing"
@@ -692,6 +693,11 @@ func TestAuthenticationFlows(t *testing.T) {
 					user := app.state.CreateUserForTest("followup-user")

 					node := app.state.CreateNodeForTest(user, "followup-success-node")
+					// [State.HandleNodeFromAuthPath] resolves the node from the
+					// machine key cached when the registration was opened, so on
+					// the real path the node carries the polling session's
+					// machine key. CreateNodeForTest picks a random one.
+					node.MachineKey = machineKey1.Public()
 					nodeToRegister.FinishAuth(types.AuthVerdict{Node: node.View()})
 				}()

@@ -1699,7 +1705,7 @@ func TestAuthenticationFlows(t *testing.T) {
 				assert.False(t, resp.NodeKeyExpired)

 				// Verify NEW node was created for user2
-				node2, found := app.state.GetNodeByMachineKey(machineKey1.Public(), types.UserID(2))
+				node2, found := app.state.GetNodesByMachineKeyAllUsers(machineKey1.Public())[types.UserID(2)]
 				require.True(t, found, "new node should exist for user2")
 				assert.Equal(t, uint(2), node2.UserID().Get(), "new node should belong to user2")

@@ -1707,7 +1713,7 @@ func TestAuthenticationFlows(t *testing.T) {
 				assert.Equal(t, "user2-context", user.Name(), "new node should show user2 username")

 				// Verify original node still exists for user1
-				node1, found := app.state.GetNodeByMachineKey(machineKey1.Public(), types.UserID(1))
+				node1, found := app.state.GetNodesByMachineKeyAllUsers(machineKey1.Public())[types.UserID(1)]
 				require.True(t, found, "original node should still exist for user1")
 				assert.Equal(t, uint(1), node1.UserID().Get(), "original node should still belong to user1")

@@ -1775,13 +1781,13 @@ func TestAuthenticationFlows(t *testing.T) {
 			validateCompleteResponse: true,
 			validate: func(t *testing.T, resp *tailcfg.RegisterResponse, app *Headscale) { //nolint:thelper
 				// User1's original node should STILL exist (not transferred)
-				node1, found1 := app.state.GetNodeByMachineKey(machineKey1.Public(), types.UserID(1))
+				node1, found1 := app.state.GetNodesByMachineKeyAllUsers(machineKey1.Public())[types.UserID(1)]
 				require.True(t, found1, "user1's original node should still exist")
 				assert.Equal(t, uint(1), node1.UserID().Get(), "user1's node should still belong to user1")
 				assert.Equal(t, nodeKey1.Public(), node1.NodeKey(), "user1's node should have original node key")

 				// User2 should have a NEW node created
-				node2, found2 := app.state.GetNodeByMachineKey(machineKey1.Public(), types.UserID(2))
+				node2, found2 := app.state.GetNodesByMachineKeyAllUsers(machineKey1.Public())[types.UserID(2)]
 				require.True(t, found2, "user2 should have new node created")
 				assert.Equal(t, uint(2), node2.UserID().Get(), "user2's node should belong to user2")

@@ -2914,7 +2920,7 @@ func TestPreAuthKeyLogoutAndReloginDifferentUser(t *testing.T) {
 	for i := range 2 {
 		node := nodes[i]
 		// User1's original nodes should still be owned by user1
-		registeredNode, found := app.state.GetNodeByMachineKey(node.machineKey.Public(), types.UserID(user1.ID))
+		registeredNode, found := app.state.GetNodesByMachineKeyAllUsers(node.machineKey.Public())[types.UserID(user1.ID)]
 		require.True(t, found, "User1's original node %s should still exist", node.hostname)
 		require.Equal(t, user1.ID, registeredNode.UserID().Get(), "Node %s should still belong to user1", node.hostname)
 		t.Logf("✓ User1's original node %s (ID=%d) still owned by user1", node.hostname, registeredNode.ID().Uint64())
@@ -2923,7 +2929,7 @@ func TestPreAuthKeyLogoutAndReloginDifferentUser(t *testing.T) {
 	for i := 2; i < 4; i++ {
 		node := nodes[i]
 		// User2's original nodes should still be owned by user2
-		registeredNode, found := app.state.GetNodeByMachineKey(node.machineKey.Public(), types.UserID(user2.ID))
+		registeredNode, found := app.state.GetNodesByMachineKeyAllUsers(node.machineKey.Public())[types.UserID(user2.ID)]
 		require.True(t, found, "User2's original node %s should still exist", node.hostname)
 		require.Equal(t, user2.ID, registeredNode.UserID().Get(), "Node %s should still belong to user2", node.hostname)
 		t.Logf("✓ User2's original node %s (ID=%d) still owned by user2", node.hostname, registeredNode.ID().Uint64())
@@ -2935,7 +2941,7 @@ func TestPreAuthKeyLogoutAndReloginDifferentUser(t *testing.T) {
 	for i := 2; i < 4; i++ {
 		node := nodes[i]
 		// Should be able to find a node with user1 and this machine key (the new one)
-		newNode, found := app.state.GetNodeByMachineKey(node.machineKey.Public(), types.UserID(user1.ID))
+		newNode, found := app.state.GetNodesByMachineKeyAllUsers(node.machineKey.Public())[types.UserID(user1.ID)]
 		require.True(t, found, "Should have created new node for user1 with machine key from %s", node.hostname)
 		require.Equal(t, user1.ID, newNode.UserID().Get(), "New node should belong to user1")
 		t.Logf("✓ New node created for user1 with machine key from %s (ID=%d)", node.hostname, newNode.ID().Uint64())
@@ -2984,7 +2990,7 @@ func TestWebFlowReauthDifferentUser(t *testing.T) {
 	require.True(t, resp1.MachineAuthorized, "Should be authorized via pre-auth key")

 	// Verify node exists for user1
-	user1Node, found := app.state.GetNodeByMachineKey(machineKey.Public(), types.UserID(user1.ID))
+	user1Node, found := app.state.GetNodesByMachineKeyAllUsers(machineKey.Public())[types.UserID(user1.ID)]
 	require.True(t, found, "Node should exist for user1")
 	require.Equal(t, user1.ID, user1Node.UserID().Get(), "Node should belong to user1")
 	user1NodeID := user1Node.ID()
@@ -3000,7 +3006,7 @@ func TestWebFlowReauthDifferentUser(t *testing.T) {
 	require.NoError(t, err)

 	// Verify node is expired
-	user1Node, found = app.state.GetNodeByMachineKey(machineKey.Public(), types.UserID(user1.ID))
+	user1Node, found = app.state.GetNodesByMachineKeyAllUsers(machineKey.Public())[types.UserID(user1.ID)]
 	require.True(t, found, "Node should still exist after logout")
 	require.True(t, user1Node.IsExpired(), "Node should be expired after logout")
 	t.Logf("✓ User1 node expired (logged out)")
@@ -3041,7 +3047,7 @@ func TestWebFlowReauthDifferentUser(t *testing.T) {

 	t.Run("user1_original_node_still_exists", func(t *testing.T) {
 		// User1's original node should STILL exist (not transferred to user2)
-		user1NodeAfter, found1 := app.state.GetNodeByMachineKey(machineKey.Public(), types.UserID(user1.ID))
+		user1NodeAfter, found1 := app.state.GetNodesByMachineKeyAllUsers(machineKey.Public())[types.UserID(user1.ID)]
 		assert.True(t, found1, "User1's original node should still exist (not transferred)")

 		if !found1 {
@@ -3056,7 +3062,7 @@ func TestWebFlowReauthDifferentUser(t *testing.T) {

 	t.Run("user2_has_new_node_created", func(t *testing.T) {
 		// User2 should have a NEW node created (not transfer from user1)
-		user2Node, found2 := app.state.GetNodeByMachineKey(machineKey.Public(), types.UserID(user2.ID))
+		user2Node, found2 := app.state.GetNodesByMachineKeyAllUsers(machineKey.Public())[types.UserID(user2.ID)]
 		assert.True(t, found2, "User2 should have a new node created")

 		if !found2 {
@@ -3080,8 +3086,8 @@ func TestWebFlowReauthDifferentUser(t *testing.T) {

 	t.Run("both_nodes_share_machine_key", func(t *testing.T) {
 		// Both nodes should have the same machine key (same physical device)
-		user1NodeFinal, found1 := app.state.GetNodeByMachineKey(machineKey.Public(), types.UserID(user1.ID))
-		user2NodeFinal, found2 := app.state.GetNodeByMachineKey(machineKey.Public(), types.UserID(user2.ID))
+		user1NodeFinal, found1 := app.state.GetNodesByMachineKeyAllUsers(machineKey.Public())[types.UserID(user1.ID)]
+		user2NodeFinal, found2 := app.state.GetNodesByMachineKeyAllUsers(machineKey.Public())[types.UserID(user2.ID)]

 		require.True(t, found1, "User1 node should exist")
 		require.True(t, found2, "User2 node should exist")
@@ -4101,3 +4107,150 @@ func TestHandleNodeFromAuthPath_OldUserNil_NoPanic(t *testing.T) {
 	assert.NotEqual(t, types.NodeID(99002), node.ID(), "new node, not orphan")
 	assert.Equal(t, userB.ID, node.UserID().Get(), "new node belongs to userB")
 }
+
+// TestWaitForFollowupMachineKeyMismatch covers the followup poll in
+// [Headscale.waitForFollowup]. That poll is authenticated only by the auth ID
+// embedded in the followup URL, so without a machine-key check anyone who
+// learns an ID gets the registering user's User/Login back in the
+// [tailcfg.RegisterResponse].
+//
+// [Headscale.handleRegister] and [Headscale.handleLogout] already fail closed
+// here; see the "existing_node_machine_key_mismatch" case in
+// [TestAuthenticationFlows] for the equivalent assertion on that path.
+//
+// The nodes are given the registering session's machine key because that is
+// what production produces: [State.HandleNodeFromAuthPath] resolves the node
+// from the machine key cached in [types.RegistrationData] when the
+// registration was opened.
+func TestWaitForFollowupMachineKeyMismatch(t *testing.T) {
+	app := createTestApp(t)
+
+	victimMachineKey := key.NewMachine()
+	attackerMachineKey := key.NewMachine()
+
+	// Park a completed registration in the auth cache, as a node that is
+	// already polling for its verdict would see it.
+	newPendingFollowup := func(hostname string) string {
+		authID := types.MustAuthID()
+		regEntry := types.NewRegisterAuthRequest(&types.RegistrationData{
+			MachineKey: victimMachineKey.Public(),
+			NodeKey:    key.NewNode().Public(),
+			Hostname:   hostname,
+		})
+		app.state.SetAuthCacheEntry(authID, regEntry)
+
+		user := app.state.CreateUserForTest(hostname + "-user")
+		node := app.state.CreateNodeForTest(user, hostname)
+		node.MachineKey = victimMachineKey.Public()
+		// CreateNodeForTest only sets UserID, but nodeToRegisterResponse reads
+		// the owner, and the owner's identity is exactly what must not leak.
+		node.User = user
+		regEntry.FinishAuth(types.AuthVerdict{Node: node.View()})
+
+		return fmt.Sprintf("http://localhost:8080/register/%s", authID)
+	}
+
+	followup := func(url string, machineKey key.MachinePublic) (*tailcfg.RegisterResponse, error) {
+		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+
+		return app.handleRegister(ctx, tailcfg.RegisterRequest{
+			Followup: url,
+			NodeKey:  key.NewNode().Public(),
+		}, machineKey)
+	}
+
+	t.Run("mismatched machine key is rejected", func(t *testing.T) {
+		resp, err := followup(newPendingFollowup("followup-mismatch"), attackerMachineKey.Public())
+
+		require.Error(t, err, "followup with a foreign machine key must not succeed")
+		assert.Nil(t, resp, "no registration details should be returned")
+
+		var httpErr HTTPError
+		require.ErrorAs(t, err, &httpErr)
+		assert.Equal(t, http.StatusUnauthorized, httpErr.Code)
+	})
+
+	// Positive control. Without it a regression that stops the poll from
+	// finding the cache entry at all would still pass the case above, because
+	// waitForFollowup falls back to handing out a fresh AuthURL.
+	t.Run("matching machine key still completes", func(t *testing.T) {
+		resp, err := followup(newPendingFollowup("followup-match"), victimMachineKey.Public())
+
+		require.NoError(t, err)
+		require.NotNil(t, resp)
+		assert.True(t, resp.MachineAuthorized)
+		assert.NotEmpty(t, resp.User.DisplayName, "the owner's identity is returned on the legitimate path")
+	})
+}
+
+// TestFollowupWaitPrefersCompletedAuthOverExpiredContext reproduces
+// https://github.com/juanfont/headscale/issues/3385.
+//
+// Root cause: [Headscale.waitForFollowup] selects on ctx.Done() and the auth
+// verdict channel with equal priority. When the registration has ALREADY
+// completed (verdict buffered) but the request context has ALSO expired, Go's
+// select picks a ready case at random, so roughly half the time it returns
+// "registration timed out" and discards a successful registration.
+//
+// The v0.28.0 hscontrol test suite hit this because the followup context
+// timeout was only 100ms while the setup goroutine (create user + node in
+// SQLite) frequently took longer on slower/constrained builders (ppc64le,
+// Alpine CI). Both channels ended up ready at once and the flake surfaced as
+// TestAuthenticationFlows/followup_registration_success failing with
+// "http error[401]: registration timed out".
+//
+// The fix must give the completed-auth case priority over context
+// cancellation. This test forces both cases ready on every iteration; it must
+// never report a timeout.
+func TestFollowupWaitPrefersCompletedAuthOverExpiredContext(t *testing.T) {
+	app := createTestApp(t)
+
+	machineKey := key.NewMachine().Public()
+	nodeKey := key.NewNode().Public()
+
+	const iterations = 300
+
+	timeouts, authorized := 0, 0
+
+	for i := range iterations {
+		regID, err := types.NewAuthID()
+		require.NoError(t, err)
+
+		authReq := types.NewRegisterAuthRequest(&types.RegistrationData{
+			Hostname: "followup-race-node",
+		})
+		app.state.SetAuthCacheEntry(regID, authReq)
+
+		// Registration completes BEFORE we wait: verdict is buffered.
+		user := app.state.CreateUserForTest(fmt.Sprintf("followup-race-user-%d", i))
+		node := app.state.CreateNodeForTest(user, "followup-race-node")
+		// waitForFollowup fails closed unless the node carries the polling
+		// session's machine key; production sets this via the cached
+		// RegistrationData. CreateNodeForTest picks a random one.
+		node.MachineKey = machineKey
+		authReq.FinishAuth(types.AuthVerdict{Node: node.View()})
+
+		// Context is expired BEFORE we wait: both select cases are ready.
+		ctx, cancel := context.WithCancel(context.Background())
+		cancel()
+
+		req := tailcfg.RegisterRequest{
+			Followup: fmt.Sprintf("http://localhost:8080/register/%s", regID),
+			NodeKey:  nodeKey,
+		}
+
+		resp, err := app.waitForFollowup(ctx, req, machineKey)
+		switch {
+		case err != nil:
+			timeouts++
+		case resp != nil && resp.MachineAuthorized:
+			authorized++
+		}
+	}
+
+	assert.Zero(t, timeouts,
+		"waitForFollowup must never report a timeout when auth has already completed; got %d/%d timeouts",
+		timeouts, iterations)
+	assert.Equal(t, iterations, authorized, "every completed registration must be returned as authorized")
+}
@@ -109,7 +109,10 @@ func (hsdb *HSDatabase) GetAPIKey(prefix string) (*types.APIKey, error) {
 // GetAPIKeyByID returns a [types.APIKey] for a given id.
 func (hsdb *HSDatabase) GetAPIKeyByID(id uint64) (*types.APIKey, error) {
 	key := types.APIKey{}
-	if result := hsdb.DB.Find(&types.APIKey{ID: id}).First(&key); result.Error != nil {
+	// Query on an explicit primary-key clause: a struct condition would drop a
+	// zero-valued ID, making the lookup unconditional and returning the first
+	// row instead of not-found.
+	if result := hsdb.DB.First(&key, "id = ?", id); result.Error != nil {
 		return nil, result.Error
 	}

@@ -0,0 +1,28 @@
+package db
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestGetAPIKeyByIDZeroReturnsError ensures GetAPIKeyByID(0) reports not-found
+// rather than returning the lowest-ID key. GORM drops a zero-valued primary key
+// from a struct condition, which would otherwise make the lookup unconditional.
+func TestGetAPIKeyByIDZeroReturnsError(t *testing.T) {
+	db, err := newSQLiteTestDB()
+	require.NoError(t, err)
+
+	_, key1, err := db.CreateAPIKey(nil)
+	require.NoError(t, err)
+	require.NotNil(t, key1)
+
+	_, key2, err := db.CreateAPIKey(nil)
+	require.NoError(t, err)
+	require.NotNil(t, key2)
+
+	key, err := db.GetAPIKeyByID(0)
+	require.Error(t, err, "GetAPIKeyByID(0) should be not-found, got key=%+v", key)
+	assert.Nil(t, key)
+}
@@ -706,13 +706,20 @@ AND auth_key_id NOT IN (
 				// but this prevents deleting users whose nodes have been
 				// tagged, and the ON DELETE CASCADE FK would destroy the
 				// tagged nodes if the user were deleted.
+				//
+				// A nil tags slice marshals to the JSON literal 'null', so
+				// untagged nodes can carry tags='null'. That spelling must be
+				// excluded alongside '[]' and '' or untagged nodes lose their
+				// user. Nodes already detached by the earlier version of this
+				// migration are repaired by the recovery migration below.
 				// Fixes: https://github.com/juanfont/headscale/issues/3077
+				// Fixes: https://github.com/juanfont/headscale/issues/3323
 				ID: "202602201200-clear-tagged-node-user-id",
 				Migrate: func(tx *gorm.DB) error {
 					err := tx.Exec(`
 UPDATE nodes
 SET user_id = NULL
-WHERE tags IS NOT NULL AND tags != '[]' AND tags != '';
+WHERE tags IS NOT NULL AND tags != '[]' AND tags != '' AND tags != 'null';
 						`).Error
 					if err != nil {
 						return fmt.Errorf("clearing user_id on tagged nodes: %w", err)
@@ -744,6 +751,63 @@ WHERE expiry IS NOT NULL AND expiry < '1900-01-01';
 				},
 				Rollback: func(db *gorm.DB) error { return nil },
 			},
+			{
+				// Recover user_id on untagged nodes detached by the earlier
+				// version of 202602201200-clear-tagged-node-user-id, which
+				// treated tags='null' as tagged and cleared the user. This
+				// repairs databases that already upgraded to 0.29.0; fresh
+				// upgrades are protected by the fixed migration above and find
+				// nothing to repair. Recovery is best-effort: the owner is
+				// re-derived from the node's pre-auth key, so nodes registered
+				// via CLI/OIDC (no pre-auth key) cannot be recovered and must
+				// be reassigned manually.
+				// Fixes: https://github.com/juanfont/headscale/issues/3323
+				ID: "202606181200-recover-null-tags-node-user-id",
+				Migrate: func(tx *gorm.DB) error {
+					err := tx.Exec(`
+UPDATE nodes
+SET user_id = (
+	SELECT pak.user_id FROM pre_auth_keys pak WHERE pak.id = nodes.auth_key_id
+)
+WHERE user_id IS NULL
+	AND auth_key_id IS NOT NULL
+	AND (tags IS NULL OR tags = '' OR tags = '[]' OR tags = 'null');
+						`).Error
+					if err != nil {
+						return fmt.Errorf("recovering user_id on untagged nodes: %w", err)
+					}
+
+					return nil
+				},
+				Rollback: func(db *gorm.DB) error { return nil },
+			},
+			{
+				// Clear stale key expiry on tagged nodes. A tagged node is
+				// owned by its tags and never expires (KB 1068), but a buggy
+				// handleLogout stamped a past expiry on it, leaving it
+				// permanently Expired and unable to re-authenticate. The
+				// buggy writer is fixed, so this only repairs rows written
+				// before the upgrade; a fixed server cannot recreate them.
+				// Match the tagged-node predicate the earlier
+				// clear-tagged-node-user-id migration uses (a nil tags slice
+				// marshals to 'null', so exclude it).
+				// Fixes: https://github.com/juanfont/headscale/issues/3371
+				ID: "202607241200-clear-tagged-node-expiry",
+				Migrate: func(tx *gorm.DB) error {
+					err := tx.Exec(`
+UPDATE nodes
+SET expiry = NULL
+WHERE tags IS NOT NULL AND tags != '[]' AND tags != '' AND tags != 'null'
+	AND expiry IS NOT NULL;
+						`).Error
+					if err != nil {
+						return fmt.Errorf("clearing expiry on tagged nodes: %w", err)
+					}
+
+					return nil
+				},
+				Rollback: func(db *gorm.DB) error { return nil },
+			},
 		},
 	)

@@ -198,6 +198,161 @@ func TestSQLiteMigrationAndDataValidation(t *testing.T) {
 				assert.False(t, node5.IsExpired(), "node5 should not be reported as expired")
 			},
 		},
+		// Test for the clear-tagged-node-user-id migration
+		// (202602201200-clear-tagged-node-user-id). A nil tags slice
+		// marshals to the JSON literal 'null', so untagged nodes can carry
+		// tags='null' in the database. The migration must only clear
+		// user_id on genuinely tagged nodes, not on these untagged ones.
+		// Fixes: https://github.com/juanfont/headscale/issues/3323
+		{
+			dbPath: "testdata/sqlite/null_tags_user_id_migration_test.sql",
+			wantFunc: func(t *testing.T, hsdb *HSDatabase) {
+				t.Helper()
+
+				nodes, err := Read(hsdb.DB, func(rx *gorm.DB) (types.Nodes, error) {
+					return ListNodes(rx)
+				})
+				require.NoError(t, err)
+				require.Len(t, nodes, 4, "should have all 4 nodes")
+
+				byHostname := make(map[string]*types.Node, len(nodes))
+				for _, n := range nodes {
+					byHostname[n.Hostname] = n
+				}
+
+				// Node 1 had tags='null' (untagged) and belonged to user2.
+				// The migration must NOT clear its user_id.
+				node1 := byHostname["node1"]
+				require.NotNil(t, node1, "node1 should exist")
+				assert.False(t, node1.IsTagged(), "node1 with tags='null' should be untagged")
+				require.NotNil(t, node1.UserID, "node1 should keep its user assigned")
+				assert.Equal(t, uint(2), *node1.UserID, "node1 should still belong to user2")
+
+				// Node 2 is genuinely tagged; user_id must be cleared.
+				node2 := byHostname["node2"]
+				require.NotNil(t, node2, "node2 should exist")
+				assert.True(t, node2.IsTagged(), "node2 should be tagged")
+				assert.Nil(t, node2.UserID, "node2 (tagged) should have user_id cleared")
+
+				// Node 3 had tags='[]' (untagged); user_id preserved.
+				node3 := byHostname["node3"]
+				require.NotNil(t, node3, "node3 should exist")
+				assert.False(t, node3.IsTagged(), "node3 with tags='[]' should be untagged")
+				require.NotNil(t, node3.UserID, "node3 should keep its user assigned")
+				assert.Equal(t, uint(1), *node3.UserID, "node3 should still belong to user1")
+
+				// Node 4 had tags='' (untagged); user_id preserved.
+				node4 := byHostname["node4"]
+				require.NotNil(t, node4, "node4 should exist")
+				assert.False(t, node4.IsTagged(), "node4 with tags='' should be untagged")
+				require.NotNil(t, node4.UserID, "node4 should keep its user assigned")
+				assert.Equal(t, uint(1), *node4.UserID, "node4 should still belong to user1")
+			},
+		},
+		// Test for the null-tags user_id recovery migration. Databases that
+		// already upgraded to 0.29.0 had user_id wrongly cleared on untagged
+		// nodes with tags='null'. The recovery migration re-derives user_id
+		// from the node's pre-auth key where one exists.
+		// Fixes: https://github.com/juanfont/headscale/issues/3323
+		{
+			dbPath: "testdata/sqlite/recover_null_tags_user_id_migration_test.sql",
+			wantFunc: func(t *testing.T, hsdb *HSDatabase) {
+				t.Helper()
+
+				nodes, err := Read(hsdb.DB, func(rx *gorm.DB) (types.Nodes, error) {
+					return ListNodes(rx)
+				})
+				require.NoError(t, err)
+				require.Len(t, nodes, 4, "should have all 4 nodes")
+
+				byHostname := make(map[string]*types.Node, len(nodes))
+				for _, n := range nodes {
+					byHostname[n.Hostname] = n
+				}
+
+				// Node 1: authkey-registered, orphaned by the bug. The recovery
+				// migration restores user_id from its pre-auth key (user2).
+				node1 := byHostname["node1"]
+				require.NotNil(t, node1, "node1 should exist")
+				require.NotNil(t, node1.UserID, "node1 user_id should be recovered")
+				assert.Equal(t, uint(2), *node1.UserID, "node1 should be recovered to user2")
+
+				// Node 2: genuinely tagged, correctly cleared. Must stay cleared.
+				node2 := byHostname["node2"]
+				require.NotNil(t, node2, "node2 should exist")
+				assert.True(t, node2.IsTagged(), "node2 should be tagged")
+				assert.Nil(t, node2.UserID, "node2 (tagged) must remain cleared")
+
+				// Node 3: CLI-registered, no pre-auth key. Unrecoverable.
+				node3 := byHostname["node3"]
+				require.NotNil(t, node3, "node3 should exist")
+				assert.Nil(t, node3.UserID, "node3 has no pre-auth key to recover from")
+
+				// Node 4: never orphaned; user_id must be untouched.
+				node4 := byHostname["node4"]
+				require.NotNil(t, node4, "node4 should exist")
+				require.NotNil(t, node4.UserID, "node4 user_id should be untouched")
+				assert.Equal(t, uint(1), *node4.UserID, "node4 should still belong to user1")
+			},
+		},
+		// Test for the clear-tagged-node-expiry migration
+		// (202607241200-clear-tagged-node-expiry). A buggy handleLogout stamped
+		// a key expiry on tagged nodes, which never expire (KB 1068), leaving
+		// them permanently Expired. The migration clears expiry on tagged rows
+		// only, preserving user-owned nodes' expiry.
+		// Fixes: https://github.com/juanfont/headscale/issues/3371
+		{
+			dbPath: "testdata/sqlite/clear_tagged_node_expiry_migration_test.sql",
+			wantFunc: func(t *testing.T, hsdb *HSDatabase) {
+				t.Helper()
+
+				nodes, err := Read(hsdb.DB, func(rx *gorm.DB) (types.Nodes, error) {
+					return ListNodes(rx)
+				})
+				require.NoError(t, err)
+				require.Len(t, nodes, 5, "should have all 5 nodes")
+
+				byHostname := make(map[string]*types.Node, len(nodes))
+				for _, n := range nodes {
+					byHostname[n.Hostname] = n
+				}
+
+				// Node 1: tagged with a stale PAST expiry (the bug). Cleared.
+				node1 := byHostname["node1"]
+				require.NotNil(t, node1, "node1 should exist")
+				assert.True(t, node1.IsTagged(), "node1 should be tagged")
+				assert.Nil(t, node1.Expiry, "node1 (tagged) stale expiry should be cleared")
+				assert.False(t, node1.IsExpired(), "node1 must not be reported expired")
+
+				// Node 2: tagged with a FUTURE expiry. Tagged nodes never expire,
+				// so this is cleared too.
+				node2 := byHostname["node2"]
+				require.NotNil(t, node2, "node2 should exist")
+				assert.True(t, node2.IsTagged(), "node2 should be tagged")
+				assert.Nil(t, node2.Expiry, "node2 (tagged) expiry should be cleared")
+
+				// Node 3: tagged, expiry already NULL. Stays NULL.
+				node3 := byHostname["node3"]
+				require.NotNil(t, node3, "node3 should exist")
+				assert.True(t, node3.IsTagged(), "node3 should be tagged")
+				assert.Nil(t, node3.Expiry, "node3 (tagged) NULL expiry should be preserved")
+
+				// Node 4: untagged (tags='null') with a PAST expiry. PRESERVED —
+				// the migration must not touch user-owned nodes.
+				node4 := byHostname["node4"]
+				require.NotNil(t, node4, "node4 should exist")
+				assert.False(t, node4.IsTagged(), "node4 (tags='null') should be untagged")
+				require.NotNil(t, node4.Expiry, "node4 (user-owned) expiry must be preserved")
+				assert.Equal(t, 2020, node4.Expiry.UTC().Year(), "node4 past expiry preserved")
+
+				// Node 5: untagged (tags='[]') with a FUTURE expiry. PRESERVED.
+				node5 := byHostname["node5"]
+				require.NotNil(t, node5, "node5 should exist")
+				assert.False(t, node5.IsTagged(), "node5 (tags='[]') should be untagged")
+				require.NotNil(t, node5.Expiry, "node5 (user-owned) expiry must be preserved")
+				assert.Equal(t, 2099, node5.Expiry.UTC().Year(), "node5 future expiry preserved")
+			},
+		},
 	}

 	for _, tt := range tests {
@@ -2,6 +2,7 @@ package db

 import (
 	"runtime"
+	"slices"
 	"sync"
 	"sync/atomic"
 	"testing"
@@ -9,6 +10,7 @@ import (

 	"github.com/juanfont/headscale/hscontrol/types"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )

 const (
@@ -89,6 +91,82 @@ func TestEphemeralGarbageCollectorGoRoutineLeak(t *testing.T) {
 	t.Logf("Final number of goroutines: %d", runtime.NumGoroutine())
 }

+// TestEphemeralGarbageCollectorCancelReapsGoroutine verifies that Cancel (and
+// reschedule) reaps the per-node watcher goroutine while the collector is still
+// running, rather than leaking it until Close. The production churn path is an
+// ephemeral node disconnecting (Schedule) then reconnecting (Cancel) before the
+// long expiry timer fires; a stopped timer never fires, so a watcher parked
+// only on <-timer.C would otherwise leak on every cycle.
+func TestEphemeralGarbageCollectorCancelReapsGoroutine(t *testing.T) {
+	gc := NewEphemeralGarbageCollector(func(types.NodeID) {})
+
+	go gc.Start()
+	defer gc.Close()
+
+	baseline := runtime.NumGoroutine()
+
+	const (
+		iterations = 1000
+		nodeID     = types.NodeID(42)
+	)
+
+	for range iterations {
+		gc.Schedule(nodeID, time.Hour) // disconnect: long timer, will not fire
+		gc.Cancel(nodeID)              // reconnect: must reap the watcher
+	}
+
+	assert.EventuallyWithT(t, func(c *assert.CollectT) {
+		assert.LessOrEqual(c, runtime.NumGoroutine(), baseline+10,
+			"per-node goroutines leaked on Cancel/reschedule")
+	}, 2*time.Second, 20*time.Millisecond, "watcher goroutines should be reaped")
+}
+
+// TestEphemeralGarbageCollectorCancelBeatsQueuedDeletion verifies that a node
+// reconnecting (Cancel) after its deletion has already been queued on the
+// internal channel is not deleted. The timer fires and enqueues the deletion;
+// Cancel then runs before Start drains it. Start must drop the now-superseded
+// deletion rather than removing the freshly reconnected node.
+func TestEphemeralGarbageCollectorCancelBeatsQueuedDeletion(t *testing.T) {
+	const targetNode types.NodeID = 42
+
+	var (
+		mu      sync.Mutex
+		deleted []types.NodeID
+	)
+
+	e := NewEphemeralGarbageCollector(func(ni types.NodeID) {
+		mu.Lock()
+		defer mu.Unlock()
+
+		deleted = append(deleted, ni)
+	})
+
+	// Schedule with a tiny expiry but do not drain yet: the watcher fires and
+	// enqueues the deletion onto the buffered channel.
+	e.Schedule(targetNode, time.Millisecond)
+	require.Eventually(t, func() bool {
+		return len(e.deleteCh) == 1
+	}, time.Second, time.Millisecond, "deletion should be queued")
+
+	// Node reconnects before the queue is drained.
+	e.Cancel(targetNode)
+
+	go e.Start()
+	defer e.Close()
+
+	require.Eventually(t, func() bool {
+		return len(e.deleteCh) == 0
+	}, time.Second, time.Millisecond, "Start should drain the queued deletion")
+
+	assert.Never(t, func() bool {
+		mu.Lock()
+		defer mu.Unlock()
+
+		return slices.Contains(deleted, targetNode)
+	}, 200*time.Millisecond, 10*time.Millisecond,
+		"cancelled node must not be deleted")
+}
+
 // TestEphemeralGarbageCollectorReschedule is a test for the rescheduling of nodes in [EphemeralGarbageCollector].
 // It creates a new [EphemeralGarbageCollector], schedules a node for deletion with a longer expiry,
 // and then reschedules it with a shorter expiry, and verifies that the node is deleted only once.
@@ -170,11 +170,36 @@ func (i *IPAllocator) Next() (*netip.Addr, *netip.Addr, error) {

 var ErrCouldNotAllocateIP = errors.New("failed to allocate IP")

-func (i *IPAllocator) nextLocked(prev netip.Addr, prefix *netip.Prefix) (*netip.Addr, error) {
+// allocateNext4 allocates the next IPv4 under i.mu, advancing prev4 so a run of
+// allocations (e.g. BackfillNodeIPs) does not rescan already-issued addresses,
+// and so prev4 is read under the lock rather than in the caller's frame.
+func (i *IPAllocator) allocateNext4() (*netip.Addr, error) {
 	i.mu.Lock()
 	defer i.mu.Unlock()

-	return i.next(prev, prefix)
+	ret, err := i.next(i.prev4, i.prefix4)
+	if err != nil {
+		return nil, err
+	}
+
+	i.prev4 = *ret
+
+	return ret, nil
+}
+
+// allocateNext6 mirrors allocateNext4 for the IPv6 prefix.
+func (i *IPAllocator) allocateNext6() (*netip.Addr, error) {
+	i.mu.Lock()
+	defer i.mu.Unlock()
+
+	ret, err := i.next(i.prev6, i.prefix6)
+	if err != nil {
+		return nil, err
+	}
+
+	i.prev6 = *ret
+
+	return ret, nil
 }

 func (i *IPAllocator) next(prev netip.Addr, prefix *netip.Prefix) (*netip.Addr, error) {
@@ -200,30 +225,40 @@ func (i *IPAllocator) next(prev netip.Addr, prefix *netip.Prefix) (*netip.Addr,
 		return nil, err
 	}

+	// Walk forward from the starting address until a free, non-reserved
+	// address inside the prefix is found. The random strategy only picks the
+	// starting point at random and then scans deterministically: this keeps
+	// the loop finite, so an exhausted prefix returns ErrCouldNotAllocateIP
+	// instead of re-drawing in-prefix addresses forever under i.mu.
+	start := ip
 	for {
-		if !prefix.Contains(ip) {
-			return nil, ErrCouldNotAllocateIP
+		if prefix.Contains(ip) && !set.Contains(ip) && !isTailscaleReservedIP(ip) {
+			i.usedIPs.Add(ip)
+
+			return &ip, nil
 		}

-		// Check if the IP has already been allocated
-		// or if it is a IP reserved by Tailscale.
-		if set.Contains(ip) || isTailscaleReservedIP(ip) {
-			switch i.strategy {
-			case types.IPAllocationStrategySequential:
-				ip = ip.Next()
-			case types.IPAllocationStrategyRandom:
-				ip, err = randomNext(*prefix)
-				if err != nil {
-					return nil, fmt.Errorf("getting random IP: %w", err)
-				}
+		ip = ip.Next()
+
+		switch i.strategy {
+		case types.IPAllocationStrategySequential:
+			// Sequential allocation never wraps: walking past the end of
+			// the prefix means the pool is exhausted.
+			if !prefix.Contains(ip) {
+				return nil, ErrCouldNotAllocateIP
+			}
+		case types.IPAllocationStrategyRandom:
+			// Random allocation wraps within the prefix so every address is
+			// examined exactly once; returning to the start means the prefix
+			// is exhausted.
+			if !prefix.Contains(ip) {
+				ip = prefix.Masked().Addr()
 			}

-			continue
+			if ip == start {
+				return nil, ErrCouldNotAllocateIP
+			}
 		}
-
-		i.usedIPs.Add(ip)
-
-		return &ip, nil
 	}
 }

@@ -241,6 +276,12 @@ func randomNext(pfx netip.Prefix) (netip.Addr, error) {
 	// after.
 	tempMax := big.NewInt(0).Sub(&to, &from)

+	// A single-address prefix (/32 or /128) has from == to, so tempMax is 0 and
+	// rand.Int would panic on a non-positive bound. Return the sole address.
+	if tempMax.Sign() <= 0 {
+		return fromIP, nil
+	}
+
 	out, err := rand.Int(rand.Reader, tempMax)
 	if err != nil {
 		return netip.Addr{}, fmt.Errorf("generating random IP: %w", err)
@@ -248,7 +289,10 @@ func randomNext(pfx netip.Prefix) (netip.Addr, error) {

 	valInRange := big.NewInt(0).Add(&from, out)

-	ip, ok := netip.AddrFromSlice(valInRange.Bytes())
+	// big.Int.Bytes() strips leading zero bytes, so a value with a zero high
+	// byte yields a too-short slice that AddrFromSlice rejects. Pad to the
+	// prefix's address width.
+	ip, ok := netip.AddrFromSlice(valInRange.FillBytes(make([]byte, len(fromIP.AsSlice()))))
 	if !ok {
 		return netip.Addr{}, errGeneratedIPBytesInvalid
 	}
@@ -304,7 +348,7 @@ func (db *HSDatabase) BackfillNodeIPs(i *IPAllocator) ([]string, error) {
 			changed := false
 			// IPv4 prefix is set, but node ip is missing, alloc
 			if i.prefix4 != nil && node.IPv4 == nil {
-				ret4, err := i.nextLocked(i.prev4, i.prefix4)
+				ret4, err := i.allocateNext4()
 				if err != nil {
 					return fmt.Errorf("allocating IPv4 for node(%d): %w", node.ID, err)
 				}
@@ -317,7 +361,7 @@ func (db *HSDatabase) BackfillNodeIPs(i *IPAllocator) ([]string, error) {

 			// IPv6 prefix is set, but node ip is missing, alloc
 			if i.prefix6 != nil && node.IPv6 == nil {
-				ret6, err := i.nextLocked(i.prev6, i.prefix6)
+				ret6, err := i.allocateNext6()
 				if err != nil {
 					return fmt.Errorf("allocating IPv6 for node(%d): %w", node.ID, err)
 				}
@@ -0,0 +1,52 @@
+package db
+
+import (
+	"net/netip"
+	"sync"
+	"testing"
+
+	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/stretchr/testify/require"
+)
+
+// TestAllocatorConcurrentNextAndBackfillNoRace exercises the registration path
+// (Next) concurrently with the backfill allocation path (allocateNext4/6) on
+// the same allocator. Backfill used to read prev4/prev6 in the caller's frame
+// without the lock, racing Next's writes; both must now take i.mu. Run with
+// -race.
+func TestAllocatorConcurrentNextAndBackfillNoRace(t *testing.T) {
+	p4 := netip.MustParsePrefix("100.64.0.0/10")
+	p6 := netip.MustParsePrefix("fd7a:115c:a1e0::/48")
+
+	alloc, err := NewIPAllocator(nil, &p4, &p6, types.IPAllocationStrategySequential)
+	require.NoError(t, err)
+
+	const iterations = 2000
+
+	var wg sync.WaitGroup
+
+	wg.Go(func() {
+		for range iterations {
+			_, _, err := alloc.Next()
+			if err != nil {
+				return
+			}
+		}
+	})
+
+	wg.Go(func() {
+		for range iterations {
+			_, err := alloc.allocateNext4()
+			if err != nil {
+				return
+			}
+
+			_, err = alloc.allocateNext6()
+			if err != nil {
+				return
+			}
+		}
+	})
+
+	wg.Wait()
+}
@@ -0,0 +1,52 @@
+package db
+
+import (
+	"errors"
+	"net/netip"
+	"testing"
+	"time"
+
+	"github.com/juanfont/headscale/hscontrol/types"
+)
+
+// TestIPAllocatorRandomExhaustionReturnsError ensures the random allocation
+// strategy terminates when its prefix is exhausted. randomNext only ever
+// returns in-prefix addresses, so the allocation loop's exhaustion exit must
+// not depend on producing an out-of-prefix candidate; otherwise Next() spins
+// forever under the allocator mutex, wedging all registration and IP release.
+//
+// 100.64.0.0/30 has four addresses: .0 (network) and .3 (broadcast) are
+// reserved, leaving .1 and .2. After two allocations the pool is exhausted and
+// the third Next() must return ErrCouldNotAllocateIP promptly.
+func TestIPAllocatorRandomExhaustionReturnsError(t *testing.T) {
+	prefix4 := netip.MustParsePrefix("100.64.0.0/30")
+
+	alloc, err := NewIPAllocator(nil, &prefix4, nil, types.IPAllocationStrategyRandom)
+	if err != nil {
+		t.Fatalf("NewIPAllocator: %v", err)
+	}
+
+	for i := range 2 {
+		_, _, err := alloc.Next()
+		if err != nil {
+			t.Fatalf("Next() #%d unexpectedly failed: %v", i+1, err)
+		}
+	}
+
+	done := make(chan error, 1)
+
+	go func() {
+		_, _, err := alloc.Next()
+		done <- err
+	}()
+
+	select {
+	case err := <-done:
+		if !errors.Is(err, ErrCouldNotAllocateIP) {
+			t.Fatalf("expected ErrCouldNotAllocateIP on exhausted prefix, got: %v", err)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("Next() on an exhausted random-strategy prefix did not return " +
+			"within 2s; it is spinning forever under the allocator mutex")
+	}
+}
@@ -143,27 +143,6 @@ func GetNodeByID(tx *gorm.DB, id types.NodeID) (*types.Node, error) {
 	return &mach, nil
 }

-func (hsdb *HSDatabase) GetNodeByMachineKey(machineKey key.MachinePublic) (*types.Node, error) {
-	return GetNodeByMachineKey(hsdb.DB, machineKey)
-}
-
-// GetNodeByMachineKey finds a [types.Node] by its [key.MachinePublic] and returns the [types.Node] struct.
-func GetNodeByMachineKey(
-	tx *gorm.DB,
-	machineKey key.MachinePublic,
-) (*types.Node, error) {
-	mach := types.Node{}
-	if result := tx.
-		Preload("AuthKey").
-		Preload("AuthKey.User").
-		Preload("User").
-		First(&mach, "machine_key = ?", machineKey.String()); result.Error != nil {
-		return nil, result.Error
-	}
-
-	return &mach, nil
-}
-
 func (hsdb *HSDatabase) GetNodeByNodeKey(nodeKey key.NodePublic) (*types.Node, error) {
 	return GetNodeByNodeKey(hsdb.DB, nodeKey)
 }
@@ -297,12 +276,16 @@ func RegisterNodeForTest(tx *gorm.DB, node types.Node, ipv4 *netip.Addr, ipv6 *n

 	logEvent.Msg("registering test node")

-	// If the a new node is registered with the same machine key, to the same user,
-	// update the existing node.
-	// If the same node is registered again, but to a new user, then that is considered
-	// a new node.
-	oldNode, _ := GetNodeByMachineKey(tx, node.MachineKey)
-	if oldNode != nil && oldNode.UserID == node.UserID {
+	// Reuse the existing node's identity only when the same machine
+	// re-registers for the same user; a different user is a new node. Match on
+	// (machine_key, user_id) precisely - a machine key can map to several nodes
+	// (one per user), so a machine-key-only lookup would be ambiguous.
+	var oldNode types.Node
+
+	err := tx.
+		Where("machine_key = ? AND user_id = ?", node.MachineKey.String(), node.UserID).
+		First(&oldNode).Error
+	if err == nil {
 		node.ID = oldNode.ID
 		node.GivenName = oldNode.GivenName
 		node.ApprovedRoutes = oldNode.ApprovedRoutes
@@ -393,18 +376,39 @@ type EphemeralGarbageCollector struct {
 	mu sync.Mutex

 	deleteFunc  func(types.NodeID)
-	toBeDeleted map[types.NodeID]*time.Timer
+	toBeDeleted map[types.NodeID]ephemeralTimer
+	// gen is bumped for every scheduled deletion so a queued deletion that
+	// was superseded by a Cancel or reschedule can be recognised and dropped.
+	gen uint64

-	deleteCh chan types.NodeID
+	deleteCh chan pendingDeletion
 	cancelCh chan struct{}
 }

+// ephemeralTimer pairs a node's pending-deletion timer with a done channel
+// used to reap its watcher goroutine on Cancel or reschedule, plus the
+// generation identifying this particular scheduling. Without the done channel
+// a stopped timer never fires and the goroutine leaks until Close.
+type ephemeralTimer struct {
+	timer *time.Timer
+	done  chan struct{}
+	gen   uint64
+}
+
+// pendingDeletion is the generation-stamped deletion a watcher enqueues when
+// its timer fires. Start drops it if the node's current generation no longer
+// matches, i.e. it was cancelled or rescheduled in the meantime.
+type pendingDeletion struct {
+	nodeID types.NodeID
+	gen    uint64
+}
+
 // NewEphemeralGarbageCollector creates a new [EphemeralGarbageCollector], it takes
 // a deleteFunc that will be called when a node is scheduled for deletion.
 func NewEphemeralGarbageCollector(deleteFunc func(types.NodeID)) *EphemeralGarbageCollector {
 	return &EphemeralGarbageCollector{
-		toBeDeleted: make(map[types.NodeID]*time.Timer),
-		deleteCh:    make(chan types.NodeID, 10),
+		toBeDeleted: make(map[types.NodeID]ephemeralTimer),
+		deleteCh:    make(chan pendingDeletion, 10),
 		cancelCh:    make(chan struct{}),
 		deleteFunc:  deleteFunc,
 	}
@@ -416,8 +420,8 @@ func (e *EphemeralGarbageCollector) Close() {
 	defer e.mu.Unlock()

 	// Stop all timers
-	for _, timer := range e.toBeDeleted {
-		timer.Stop()
+	for _, t := range e.toBeDeleted {
+		t.timer.Stop()
 	}

 	// Close the cancel channel to signal all goroutines to exit
@@ -440,13 +444,18 @@ func (e *EphemeralGarbageCollector) Schedule(nodeID types.NodeID, expiry time.Du
 		// Continue with scheduling
 	}

-	// If a timer already exists for this node, stop it first
-	if oldTimer, exists := e.toBeDeleted[nodeID]; exists {
-		oldTimer.Stop()
+	// If a timer already exists for this node, stop it and reap its
+	// watcher goroutine before scheduling a fresh one.
+	if old, exists := e.toBeDeleted[nodeID]; exists {
+		old.timer.Stop()
+		close(old.done)
 	}

+	e.gen++
+	gen := e.gen
 	timer := time.NewTimer(expiry)
-	e.toBeDeleted[nodeID] = timer
+	done := make(chan struct{})
+	e.toBeDeleted[nodeID] = ephemeralTimer{timer: timer, done: done, gen: gen}
 	// Start a goroutine to handle the timer completion
 	go func() {
 		select {
@@ -456,12 +465,18 @@ func (e *EphemeralGarbageCollector) Schedule(nodeID types.NodeID, expiry time.Du
 			// i.e. We don't want to send to deleteCh if the GC is shutting down
 			// So, we try to send to deleteCh, but also watch for cancelCh
 			select {
-			case e.deleteCh <- nodeID:
+			case e.deleteCh <- pendingDeletion{nodeID: nodeID, gen: gen}:
 				// Successfully sent to deleteCh
 			case <-e.cancelCh:
 				// GC is shutting down, don't send to deleteCh
 				return
+			case <-done:
+				// Cancelled or rescheduled before the send landed.
+				return
 			}
+		case <-done:
+			// Cancelled or rescheduled before the timer fired.
+			return
 		case <-e.cancelCh:
 			// If the GC is closed, exit the goroutine
 			return
@@ -474,24 +489,45 @@ func (e *EphemeralGarbageCollector) Cancel(nodeID types.NodeID) {
 	e.mu.Lock()
 	defer e.mu.Unlock()

-	if timer, ok := e.toBeDeleted[nodeID]; ok {
-		timer.Stop()
+	if t, ok := e.toBeDeleted[nodeID]; ok {
+		t.timer.Stop()
+		close(t.done)
 		delete(e.toBeDeleted, nodeID)
 	}
 }

+// IsScheduled reports whether a deletion timer is currently armed for nodeID.
+func (e *EphemeralGarbageCollector) IsScheduled(nodeID types.NodeID) bool {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	_, ok := e.toBeDeleted[nodeID]
+
+	return ok
+}
+
 // Start starts the garbage collector.
 func (e *EphemeralGarbageCollector) Start() {
 	for {
 		select {
 		case <-e.cancelCh:
 			return
-		case nodeID := <-e.deleteCh:
+		case pd := <-e.deleteCh:
 			e.mu.Lock()
-			delete(e.toBeDeleted, nodeID)
+
+			entry, ok := e.toBeDeleted[pd.nodeID]
+			if !ok || entry.gen != pd.gen {
+				// Cancelled or rescheduled after this deletion was queued;
+				// drop it so a reconnected node is not removed.
+				e.mu.Unlock()
+
+				continue
+			}
+
+			delete(e.toBeDeleted, pd.nodeID)
 			e.mu.Unlock()

-			go e.deleteFunc(nodeID)
+			go e.deleteFunc(pd.nodeID)
 		}
 	}
 }
@@ -15,7 +15,10 @@ import (
 )

 var (
-	ErrPreAuthKeyNotFound          = errors.New("auth-key not found")
+	// ErrPreAuthKeyNotFound wraps gorm.ErrRecordNotFound so an unknown or
+	// deleted key is treated as a missing record by callers, which the
+	// registration handler maps to a 401 rather than a raw server error.
+	ErrPreAuthKeyNotFound          = fmt.Errorf("auth-key not found: %w", gorm.ErrRecordNotFound)
 	ErrPreAuthKeyExpired           = errors.New("auth-key expired")
 	ErrSingleUseAuthKeyHasBeenUsed = errors.New("auth-key has already been used")
 	ErrUserMismatch                = errors.New("user mismatch")
@@ -487,3 +487,16 @@ func TestUsePreAuthKeyAtomicCAS(t *testing.T) {
 		"second UsePreAuthKey error must be a PAKError, got: %v", err)
 	assert.Equal(t, "authkey already used", pakErr.Error())
 }
+
+// TestGetPreAuthKeyUnknownMapsToRecordNotFound ensures an unknown (or deleted)
+// pre-auth key resolves to a record-not-found error, which the registration
+// handler maps to a 401 rather than a raw server error.
+func TestGetPreAuthKeyUnknownMapsToRecordNotFound(t *testing.T) {
+	db, err := newSQLiteTestDB()
+	require.NoError(t, err)
+
+	_, err = db.GetPreAuthKey("nonexistent-key")
+	require.Error(t, err)
+	require.ErrorIs(t, err, gorm.ErrRecordNotFound,
+		"unknown pre-auth key must map to record-not-found (handled as 401)")
+}
@@ -0,0 +1,35 @@
+package db
+
+import (
+	"net/netip"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestRandomNextSingleAddressPrefix ensures a single-address prefix (/32 or
+// /128) does not panic. from == to makes the random range zero, and rand.Int
+// panics on a non-positive bound; the sole address must be returned instead.
+func TestRandomNextSingleAddressPrefix(t *testing.T) {
+	for _, p := range []string{"100.64.0.1/32", "fd7a:115c:a1e0::1/128"} {
+		pfx := netip.MustParsePrefix(p)
+		require.NotPanics(t, func() {
+			ip, err := randomNext(pfx)
+			require.NoError(t, err)
+			assert.Equal(t, pfx.Addr(), ip)
+		}, "prefix %s", p)
+	}
+}
+
+// TestRandomNextLeadingZeroBytes ensures prefixes whose addresses have a zero
+// high byte allocate successfully. big.Int.Bytes() strips leading zeros, so the
+// drawn value would be too short for netip.AddrFromSlice without padding.
+func TestRandomNextLeadingZeroBytes(t *testing.T) {
+	pfx := netip.MustParsePrefix("0.0.0.0/16")
+	for range 100 {
+		ip, err := randomNext(pfx)
+		require.NoError(t, err)
+		assert.True(t, pfx.Contains(ip), "ip %s not in %s", ip, pfx)
+	}
+}
@@ -0,0 +1,85 @@
+-- Test SQL dump for the clear-tagged-node-expiry migration
+-- (202607241200-clear-tagged-node-expiry)
+--
+-- A buggy handleLogout stamped a past key expiry on tagged nodes. Tagged
+-- nodes are owned by their tags and never expire (KB 1068), so such a row is
+-- reported as permanently Expired and can never re-authenticate. The migration
+-- clears expiry on tagged rows while leaving user-owned nodes untouched.
+-- Fixes: https://github.com/juanfont/headscale/issues/3371
+
+PRAGMA foreign_keys=OFF;
+BEGIN TRANSACTION;
+
+-- Migrations table: entries applied up to (but not including) the fix. The
+-- intervening expiry migrations (clear-zero-time) also run against this dump;
+-- their predicates (expiry < 1900) do not match the post-2000 dates below, so
+-- they leave these rows for the new migration to handle.
+CREATE TABLE `migrations` (`id` text,PRIMARY KEY (`id`));
+INSERT INTO migrations VALUES('202312101416');
+INSERT INTO migrations VALUES('202312101430');
+INSERT INTO migrations VALUES('202402151347');
+INSERT INTO migrations VALUES('2024041121742');
+INSERT INTO migrations VALUES('202406021630');
+INSERT INTO migrations VALUES('202409271400');
+INSERT INTO migrations VALUES('202407191627');
+INSERT INTO migrations VALUES('202408181235');
+INSERT INTO migrations VALUES('202501221827');
+INSERT INTO migrations VALUES('202501311657');
+INSERT INTO migrations VALUES('202502070949');
+INSERT INTO migrations VALUES('202502131714');
+INSERT INTO migrations VALUES('202502171819');
+INSERT INTO migrations VALUES('202505091439');
+INSERT INTO migrations VALUES('202505141324');
+INSERT INTO migrations VALUES('202507021200');
+INSERT INTO migrations VALUES('202510311551');
+INSERT INTO migrations VALUES('202511101554-drop-old-idx');
+INSERT INTO migrations VALUES('202511011637-preauthkey-bcrypt');
+INSERT INTO migrations VALUES('202511122344-remove-newline-index');
+INSERT INTO migrations VALUES('202511131445-node-forced-tags-to-tags');
+INSERT INTO migrations VALUES('202601121700-migrate-hostinfo-request-tags');
+INSERT INTO migrations VALUES('202602201200-clear-tagged-node-user-id');
+
+-- Users table
+CREATE TABLE `users` (`id` integer PRIMARY KEY AUTOINCREMENT,`created_at` datetime,`updated_at` datetime,`deleted_at` datetime,`name` text,`display_name` text,`email` text,`provider_identifier` text,`provider` text,`profile_pic_url` text);
+INSERT INTO users VALUES(1,'2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL,'user1','User One','user1@example.com',NULL,NULL,NULL);
+
+-- Pre-auth keys table
+CREATE TABLE `pre_auth_keys` (`id` integer PRIMARY KEY AUTOINCREMENT,`key` text,`user_id` integer,`reusable` numeric,`ephemeral` numeric DEFAULT false,`used` numeric DEFAULT false,`tags` text,`created_at` datetime,`expiration` datetime,`prefix` text,`hash` blob,CONSTRAINT `fk_pre_auth_keys_user` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE SET NULL);
+
+-- API keys table
+CREATE TABLE `api_keys` (`id` integer PRIMARY KEY AUTOINCREMENT,`prefix` text,`hash` blob,`created_at` datetime,`expiration` datetime,`last_seen` datetime);
+
+-- Nodes table - current schema (after the tags rename + last_seen/expiry reordering)
+CREATE TABLE IF NOT EXISTS "nodes" (`id` integer PRIMARY KEY AUTOINCREMENT,`machine_key` text,`node_key` text,`disco_key` text,`endpoints` text,`host_info` text,`ipv4` text,`ipv6` text,`hostname` text,`given_name` varchar(63),`user_id` integer,`register_method` text,`tags` text,`auth_key_id` integer,`last_seen` datetime,`expiry` datetime,`approved_routes` text,`created_at` datetime,`updated_at` datetime,`deleted_at` datetime,CONSTRAINT `fk_nodes_user` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE CASCADE,CONSTRAINT `fk_nodes_auth_key` FOREIGN KEY (`auth_key_id`) REFERENCES `pre_auth_keys`(`id`));
+
+-- Node 1: TAGGED, user_id NULL, stale PAST expiry (the #3371 bug). After migration: expiry NULL.
+INSERT INTO nodes VALUES(1,'mkey:a0ab77456320823945ae0331823e3c0d516fae9585bd42698dfa1ac3d7679e01','nodekey:7c84167ab68f494942de14deb83587fd841843de2bac105b6c670048c1605501','discokey:53075b3c6cad3b62a2a29caea61beeb93f66b8c75cb89dac465236a5bbf57701','[]','{}','100.64.0.1','fd7a:115c:a1e0::1','node1','node1',NULL,'authkey','["tag:foo"]',NULL,'2024-01-01 00:00:00+00:00','2020-06-01 00:00:00+00:00','[]','2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL);
+
+-- Node 2: TAGGED, user_id NULL, FUTURE expiry. Tagged nodes never expire, so cleared to NULL too.
+INSERT INTO nodes VALUES(2,'mkey:a0ab77456320823945ae0331823e3c0d516fae9585bd42698dfa1ac3d7679e02','nodekey:7c84167ab68f494942de14deb83587fd841843de2bac105b6c670048c1605502','discokey:53075b3c6cad3b62a2a29caea61beeb93f66b8c75cb89dac465236a5bbf57702','[]','{}','100.64.0.2','fd7a:115c:a1e0::2','node2','node2',NULL,'authkey','["tag:foo"]',NULL,'2024-01-01 00:00:00+00:00','2099-01-01 00:00:00+00:00','[]','2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL);
+
+-- Node 3: TAGGED, user_id NULL, expiry already NULL. After migration: still NULL.
+INSERT INTO nodes VALUES(3,'mkey:a0ab77456320823945ae0331823e3c0d516fae9585bd42698dfa1ac3d7679e03','nodekey:7c84167ab68f494942de14deb83587fd841843de2bac105b6c670048c1605503','discokey:53075b3c6cad3b62a2a29caea61beeb93f66b8c75cb89dac465236a5bbf57703','[]','{}','100.64.0.3','fd7a:115c:a1e0::3','node3','node3',NULL,'authkey','["tag:foo"]',NULL,'2024-01-01 00:00:00+00:00',NULL,'[]','2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL);
+
+-- Node 4: UNTAGGED user-owned (tags='null'), PAST expiry. Must be PRESERVED (guard against
+-- the #3323-class over-match: a nil tags slice marshals to the literal 'null').
+INSERT INTO nodes VALUES(4,'mkey:a0ab77456320823945ae0331823e3c0d516fae9585bd42698dfa1ac3d7679e04','nodekey:7c84167ab68f494942de14deb83587fd841843de2bac105b6c670048c1605504','discokey:53075b3c6cad3b62a2a29caea61beeb93f66b8c75cb89dac465236a5bbf57704','[]','{}','100.64.0.4','fd7a:115c:a1e0::4','node4','node4',1,'cli','null',NULL,'2024-01-01 00:00:00+00:00','2020-06-01 00:00:00+00:00','[]','2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL);
+
+-- Node 5: UNTAGGED user-owned (tags='[]'), FUTURE expiry. Must be PRESERVED.
+INSERT INTO nodes VALUES(5,'mkey:a0ab77456320823945ae0331823e3c0d516fae9585bd42698dfa1ac3d7679e05','nodekey:7c84167ab68f494942de14deb83587fd841843de2bac105b6c670048c1605505','discokey:53075b3c6cad3b62a2a29caea61beeb93f66b8c75cb89dac465236a5bbf57705','[]','{}','100.64.0.5','fd7a:115c:a1e0::5','node5','node5',1,'cli','[]',NULL,'2024-01-01 00:00:00+00:00','2099-01-01 00:00:00+00:00','[]','2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL);
+
+-- Policies table (empty)
+CREATE TABLE `policies` (`id` integer PRIMARY KEY AUTOINCREMENT,`created_at` datetime,`updated_at` datetime,`deleted_at` datetime,`data` text);
+
+DELETE FROM sqlite_sequence;
+INSERT INTO sqlite_sequence VALUES('users',1);
+INSERT INTO sqlite_sequence VALUES('nodes',5);
+CREATE INDEX idx_users_deleted_at ON users(deleted_at);
+CREATE UNIQUE INDEX idx_api_keys_prefix ON api_keys(prefix);
+CREATE INDEX idx_policies_deleted_at ON policies(deleted_at);
+CREATE UNIQUE INDEX idx_provider_identifier ON users(provider_identifier) WHERE provider_identifier IS NOT NULL;
+CREATE UNIQUE INDEX idx_name_provider_identifier ON users(name, provider_identifier);
+CREATE UNIQUE INDEX idx_name_no_provider_identifier ON users(name) WHERE provider_identifier IS NULL;
+CREATE UNIQUE INDEX IF NOT EXISTS idx_pre_auth_keys_prefix ON pre_auth_keys(prefix) WHERE prefix IS NOT NULL AND prefix != '';
+
+COMMIT;
@@ -0,0 +1,85 @@
+-- Test SQL dump for the clear-tagged-node-user-id migration
+-- (202602201200-clear-tagged-node-user-id) against nodes whose tags
+-- column holds the JSON literal 'null'.
+--
+-- A nil Strings slice marshals to the JSON literal `null`, so pre-0.29
+-- databases contain untagged nodes with tags='null'. The migration's
+-- WHERE clause (tags IS NOT NULL AND tags != '[]' AND tags != '') treats
+-- the 4-character string 'null' as "tagged" and wrongly clears user_id,
+-- detaching the node from its owning user on upgrade.
+-- Fixes: https://github.com/juanfont/headscale/issues/3323
+
+PRAGMA foreign_keys=OFF;
+BEGIN TRANSACTION;
+
+-- Migrations table: every entry BEFORE clear-tagged-node-user-id has been
+-- applied. That migration is intentionally absent so it runs against this dump.
+CREATE TABLE `migrations` (`id` text,PRIMARY KEY (`id`));
+INSERT INTO migrations VALUES('202312101416');
+INSERT INTO migrations VALUES('202312101430');
+INSERT INTO migrations VALUES('202402151347');
+INSERT INTO migrations VALUES('2024041121742');
+INSERT INTO migrations VALUES('202406021630');
+INSERT INTO migrations VALUES('202409271400');
+INSERT INTO migrations VALUES('202407191627');
+INSERT INTO migrations VALUES('202408181235');
+INSERT INTO migrations VALUES('202501221827');
+INSERT INTO migrations VALUES('202501311657');
+INSERT INTO migrations VALUES('202502070949');
+INSERT INTO migrations VALUES('202502131714');
+INSERT INTO migrations VALUES('202502171819');
+INSERT INTO migrations VALUES('202505091439');
+INSERT INTO migrations VALUES('202505141324');
+INSERT INTO migrations VALUES('202507021200');
+INSERT INTO migrations VALUES('202510311551');
+INSERT INTO migrations VALUES('202511101554-drop-old-idx');
+INSERT INTO migrations VALUES('202511011637-preauthkey-bcrypt');
+INSERT INTO migrations VALUES('202511122344-remove-newline-index');
+INSERT INTO migrations VALUES('202511131445-node-forced-tags-to-tags');
+INSERT INTO migrations VALUES('202601121700-migrate-hostinfo-request-tags');
+
+-- Users table
+CREATE TABLE `users` (`id` integer PRIMARY KEY AUTOINCREMENT,`created_at` datetime,`updated_at` datetime,`deleted_at` datetime,`name` text,`display_name` text,`email` text,`provider_identifier` text,`provider` text,`profile_pic_url` text);
+INSERT INTO users VALUES(1,'2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL,'user1','User One','user1@example.com',NULL,NULL,NULL);
+INSERT INTO users VALUES(2,'2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL,'user2','User Two','user2@example.com',NULL,NULL,NULL);
+
+-- Pre-auth keys table
+CREATE TABLE `pre_auth_keys` (`id` integer PRIMARY KEY AUTOINCREMENT,`key` text,`user_id` integer,`reusable` numeric,`ephemeral` numeric DEFAULT false,`used` numeric DEFAULT false,`tags` text,`created_at` datetime,`expiration` datetime,`prefix` text,`hash` blob,CONSTRAINT `fk_pre_auth_keys_user` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE SET NULL);
+
+-- API keys table
+CREATE TABLE `api_keys` (`id` integer PRIMARY KEY AUTOINCREMENT,`prefix` text,`hash` blob,`created_at` datetime,`expiration` datetime,`last_seen` datetime);
+
+-- Nodes table - current schema (after the tags rename + last_seen/expiry reordering)
+CREATE TABLE IF NOT EXISTS "nodes" (`id` integer PRIMARY KEY AUTOINCREMENT,`machine_key` text,`node_key` text,`disco_key` text,`endpoints` text,`host_info` text,`ipv4` text,`ipv6` text,`hostname` text,`given_name` varchar(63),`user_id` integer,`register_method` text,`tags` text,`auth_key_id` integer,`last_seen` datetime,`expiry` datetime,`approved_routes` text,`created_at` datetime,`updated_at` datetime,`deleted_at` datetime,CONSTRAINT `fk_nodes_user` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE CASCADE,CONSTRAINT `fk_nodes_auth_key` FOREIGN KEY (`auth_key_id`) REFERENCES `pre_auth_keys`(`id`));
+
+-- Node 1: tags='null' (untagged, nil slice marshalled to JSON null), owned by user2.
+-- After migration: user_id MUST be preserved (this is the bug).
+INSERT INTO nodes VALUES(1,'mkey:a0ab77456320823945ae0331823e3c0d516fae9585bd42698dfa1ac3d7679e01','nodekey:7c84167ab68f494942de14deb83587fd841843de2bac105b6c670048c1605501','discokey:53075b3c6cad3b62a2a29caea61beeb93f66b8c75cb89dac465236a5bbf57701','[]','{}','100.64.0.1','fd7a:115c:a1e0::1','node1','node1',2,'cli','null',NULL,'2024-01-01 00:00:00+00:00',NULL,'[]','2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL);
+
+-- Node 2: genuinely tagged, owned by user1.
+-- After migration: user_id MUST be cleared to NULL (tagged nodes are owned by tags).
+INSERT INTO nodes VALUES(2,'mkey:a0ab77456320823945ae0331823e3c0d516fae9585bd42698dfa1ac3d7679e02','nodekey:7c84167ab68f494942de14deb83587fd841843de2bac105b6c670048c1605502','discokey:53075b3c6cad3b62a2a29caea61beeb93f66b8c75cb89dac465236a5bbf57702','[]','{}','100.64.0.2','fd7a:115c:a1e0::2','node2','node2',1,'cli','["tag:server"]',NULL,'2024-01-01 00:00:00+00:00',NULL,'[]','2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL);
+
+-- Node 3: empty-array tags (untagged), owned by user1.
+-- After migration: user_id MUST be preserved.
+INSERT INTO nodes VALUES(3,'mkey:a0ab77456320823945ae0331823e3c0d516fae9585bd42698dfa1ac3d7679e03','nodekey:7c84167ab68f494942de14deb83587fd841843de2bac105b6c670048c1605503','discokey:53075b3c6cad3b62a2a29caea61beeb93f66b8c75cb89dac465236a5bbf57703','[]','{}','100.64.0.3','fd7a:115c:a1e0::3','node3','node3',1,'cli','[]',NULL,'2024-01-01 00:00:00+00:00',NULL,'[]','2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL);
+
+-- Node 4: empty-string tags (untagged), owned by user1.
+-- After migration: user_id MUST be preserved.
+INSERT INTO nodes VALUES(4,'mkey:a0ab77456320823945ae0331823e3c0d516fae9585bd42698dfa1ac3d7679e04','nodekey:7c84167ab68f494942de14deb83587fd841843de2bac105b6c670048c1605504','discokey:53075b3c6cad3b62a2a29caea61beeb93f66b8c75cb89dac465236a5bbf57704','[]','{}','100.64.0.4','fd7a:115c:a1e0::4','node4','node4',1,'cli','',NULL,'2024-01-01 00:00:00+00:00',NULL,'[]','2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL);
+
+-- Policies table (empty)
+CREATE TABLE `policies` (`id` integer PRIMARY KEY AUTOINCREMENT,`created_at` datetime,`updated_at` datetime,`deleted_at` datetime,`data` text);
+
+DELETE FROM sqlite_sequence;
+INSERT INTO sqlite_sequence VALUES('users',2);
+INSERT INTO sqlite_sequence VALUES('nodes',4);
+CREATE INDEX idx_users_deleted_at ON users(deleted_at);
+CREATE UNIQUE INDEX idx_api_keys_prefix ON api_keys(prefix);
+CREATE INDEX idx_policies_deleted_at ON policies(deleted_at);
+CREATE UNIQUE INDEX idx_provider_identifier ON users(provider_identifier) WHERE provider_identifier IS NOT NULL;
+CREATE UNIQUE INDEX idx_name_provider_identifier ON users(name, provider_identifier);
+CREATE UNIQUE INDEX idx_name_no_provider_identifier ON users(name) WHERE provider_identifier IS NULL;
+CREATE UNIQUE INDEX IF NOT EXISTS idx_pre_auth_keys_prefix ON pre_auth_keys(prefix) WHERE prefix IS NOT NULL AND prefix != '';
+
+COMMIT;
@@ -0,0 +1,87 @@
+-- Test SQL dump for the null-tags user_id RECOVERY migration.
+--
+-- Represents a database that already upgraded to 0.29.0, where the buggy
+-- clear-tagged-node-user-id migration (202602201200) already cleared
+-- user_id on untagged nodes whose tags column held 'null'. The recovery
+-- migration runs against this state and re-derives user_id from the node's
+-- pre-auth key where possible.
+-- Fixes: https://github.com/juanfont/headscale/issues/3323
+
+PRAGMA foreign_keys=OFF;
+BEGIN TRANSACTION;
+
+-- Migrations table: everything through the current last migration has been
+-- applied (this DB already ran the buggy clear-tagged migration). The new
+-- recovery migration is intentionally absent so it runs against this dump.
+CREATE TABLE `migrations` (`id` text,PRIMARY KEY (`id`));
+INSERT INTO migrations VALUES('202312101416');
+INSERT INTO migrations VALUES('202312101430');
+INSERT INTO migrations VALUES('202402151347');
+INSERT INTO migrations VALUES('2024041121742');
+INSERT INTO migrations VALUES('202406021630');
+INSERT INTO migrations VALUES('202409271400');
+INSERT INTO migrations VALUES('202407191627');
+INSERT INTO migrations VALUES('202408181235');
+INSERT INTO migrations VALUES('202501221827');
+INSERT INTO migrations VALUES('202501311657');
+INSERT INTO migrations VALUES('202502070949');
+INSERT INTO migrations VALUES('202502131714');
+INSERT INTO migrations VALUES('202502171819');
+INSERT INTO migrations VALUES('202505091439');
+INSERT INTO migrations VALUES('202505141324');
+INSERT INTO migrations VALUES('202507021200');
+INSERT INTO migrations VALUES('202510311551');
+INSERT INTO migrations VALUES('202511101554-drop-old-idx');
+INSERT INTO migrations VALUES('202511011637-preauthkey-bcrypt');
+INSERT INTO migrations VALUES('202511122344-remove-newline-index');
+INSERT INTO migrations VALUES('202511131445-node-forced-tags-to-tags');
+INSERT INTO migrations VALUES('202601121700-migrate-hostinfo-request-tags');
+INSERT INTO migrations VALUES('202602201200-clear-tagged-node-user-id');
+INSERT INTO migrations VALUES('202605221435-clear-zero-time-node-expiry');
+
+-- Users table
+CREATE TABLE `users` (`id` integer PRIMARY KEY AUTOINCREMENT,`created_at` datetime,`updated_at` datetime,`deleted_at` datetime,`name` text,`display_name` text,`email` text,`provider_identifier` text,`provider` text,`profile_pic_url` text);
+INSERT INTO users VALUES(1,'2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL,'user1','User One','user1@example.com',NULL,NULL,NULL);
+INSERT INTO users VALUES(2,'2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL,'user2','User Two','user2@example.com',NULL,NULL,NULL);
+
+-- Pre-auth keys table. Key 1 belongs to user2, key 2 to user1.
+CREATE TABLE `pre_auth_keys` (`id` integer PRIMARY KEY AUTOINCREMENT,`key` text,`user_id` integer,`reusable` numeric,`ephemeral` numeric DEFAULT false,`used` numeric DEFAULT false,`tags` text,`created_at` datetime,`expiration` datetime,`prefix` text,`hash` blob,CONSTRAINT `fk_pre_auth_keys_user` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE SET NULL);
+INSERT INTO pre_auth_keys VALUES(1,NULL,2,1,false,true,NULL,'2024-01-01 00:00:00+00:00',NULL,'pak1',NULL);
+INSERT INTO pre_auth_keys VALUES(2,NULL,1,1,false,true,NULL,'2024-01-01 00:00:00+00:00',NULL,'pak2',NULL);
+
+-- API keys table
+CREATE TABLE `api_keys` (`id` integer PRIMARY KEY AUTOINCREMENT,`prefix` text,`hash` blob,`created_at` datetime,`expiration` datetime,`last_seen` datetime);
+
+-- Nodes table
+CREATE TABLE IF NOT EXISTS "nodes" (`id` integer PRIMARY KEY AUTOINCREMENT,`machine_key` text,`node_key` text,`disco_key` text,`endpoints` text,`host_info` text,`ipv4` text,`ipv6` text,`hostname` text,`given_name` varchar(63),`user_id` integer,`register_method` text,`tags` text,`auth_key_id` integer,`last_seen` datetime,`expiry` datetime,`approved_routes` text,`created_at` datetime,`updated_at` datetime,`deleted_at` datetime,CONSTRAINT `fk_nodes_user` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE CASCADE,CONSTRAINT `fk_nodes_auth_key` FOREIGN KEY (`auth_key_id`) REFERENCES `pre_auth_keys`(`id`));
+
+-- Node 1: authkey-registered, tags='null', already orphaned (user_id NULL) by
+-- the buggy migration. auth_key_id=1 (user2). Recovery: user_id -> 2.
+INSERT INTO nodes VALUES(1,'mkey:a0ab77456320823945ae0331823e3c0d516fae9585bd42698dfa1ac3d7679e01','nodekey:7c84167ab68f494942de14deb83587fd841843de2bac105b6c670048c1605501','discokey:53075b3c6cad3b62a2a29caea61beeb93f66b8c75cb89dac465236a5bbf57701','[]','{}','100.64.0.1','fd7a:115c:a1e0::1','node1','node1',NULL,'authkey','null',1,'2024-01-01 00:00:00+00:00',NULL,'[]','2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL);
+
+-- Node 2: genuinely tagged, user_id correctly cleared. Must stay NULL.
+INSERT INTO nodes VALUES(2,'mkey:a0ab77456320823945ae0331823e3c0d516fae9585bd42698dfa1ac3d7679e02','nodekey:7c84167ab68f494942de14deb83587fd841843de2bac105b6c670048c1605502','discokey:53075b3c6cad3b62a2a29caea61beeb93f66b8c75cb89dac465236a5bbf57702','[]','{}','100.64.0.2','fd7a:115c:a1e0::2','node2','node2',NULL,'authkey','["tag:server"]',2,'2024-01-01 00:00:00+00:00',NULL,'[]','2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL);
+
+-- Node 3: CLI-registered, tags='null', orphaned, no auth_key_id.
+-- Unrecoverable: must stay NULL.
+INSERT INTO nodes VALUES(3,'mkey:a0ab77456320823945ae0331823e3c0d516fae9585bd42698dfa1ac3d7679e03','nodekey:7c84167ab68f494942de14deb83587fd841843de2bac105b6c670048c1605503','discokey:53075b3c6cad3b62a2a29caea61beeb93f66b8c75cb89dac465236a5bbf57703','[]','{}','100.64.0.3','fd7a:115c:a1e0::3','node3','node3',NULL,'cli','null',NULL,'2024-01-01 00:00:00+00:00',NULL,'[]','2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL);
+
+-- Node 4: authkey-registered, untouched (user_id still set). Must stay user1.
+INSERT INTO nodes VALUES(4,'mkey:a0ab77456320823945ae0331823e3c0d516fae9585bd42698dfa1ac3d7679e04','nodekey:7c84167ab68f494942de14deb83587fd841843de2bac105b6c670048c1605504','discokey:53075b3c6cad3b62a2a29caea61beeb93f66b8c75cb89dac465236a5bbf57704','[]','{}','100.64.0.4','fd7a:115c:a1e0::4','node4','node4',1,'authkey','null',2,'2024-01-01 00:00:00+00:00',NULL,'[]','2024-01-01 00:00:00+00:00','2024-01-01 00:00:00+00:00',NULL);
+
+-- Policies table (empty)
+CREATE TABLE `policies` (`id` integer PRIMARY KEY AUTOINCREMENT,`created_at` datetime,`updated_at` datetime,`deleted_at` datetime,`data` text);
+
+DELETE FROM sqlite_sequence;
+INSERT INTO sqlite_sequence VALUES('users',2);
+INSERT INTO sqlite_sequence VALUES('pre_auth_keys',2);
+INSERT INTO sqlite_sequence VALUES('nodes',4);
+CREATE INDEX idx_users_deleted_at ON users(deleted_at);
+CREATE UNIQUE INDEX idx_api_keys_prefix ON api_keys(prefix);
+CREATE INDEX idx_policies_deleted_at ON policies(deleted_at);
+CREATE UNIQUE INDEX idx_provider_identifier ON users(provider_identifier) WHERE provider_identifier IS NOT NULL;
+CREATE UNIQUE INDEX idx_name_provider_identifier ON users(name, provider_identifier);
+CREATE UNIQUE INDEX idx_name_no_provider_identifier ON users(name) WHERE provider_identifier IS NULL;
+CREATE UNIQUE INDEX IF NOT EXISTS idx_pre_auth_keys_prefix ON pre_auth_keys(prefix) WHERE prefix IS NOT NULL AND prefix != '';
+
+COMMIT;
@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 	"hash/crc64"
 	"io"
-	"maps"
 	"math/rand"
 	"net/http"
 	"net/url"
@@ -85,7 +84,12 @@ func mergeDERPMaps(derpMaps []*tailcfg.DERPMap) *tailcfg.DERPMap {
 	}

 	for _, derpMap := range derpMaps {
-		maps.Copy(result.Regions, derpMap.Regions)
+		// Clone each region: copying the pointer would let a later in-place
+		// shuffle (shuffleRegionNoClone) alias regions shared with the source
+		// map or a previously served map, racing concurrent readers.
+		for id, region := range derpMap.Regions {
+			result.Regions[id] = region.Clone()
+		}
 	}

 	for id, region := range result.Regions {
@@ -0,0 +1,28 @@
+package derp
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"tailscale.com/tailcfg"
+)
+
+// TestMergeDERPMapsClonesRegions ensures merged DERP maps own their regions
+// rather than aliasing the source pointers, so a later in-place node shuffle
+// cannot mutate a shared or previously served map.
+func TestMergeDERPMapsClonesRegions(t *testing.T) {
+	src := &tailcfg.DERPMap{
+		Regions: map[int]*tailcfg.DERPRegion{
+			1: {RegionID: 1, Nodes: []*tailcfg.DERPNode{{Name: "a"}, {Name: "b"}}},
+		},
+	}
+
+	merged := mergeDERPMaps([]*tailcfg.DERPMap{src})
+
+	assert.NotSame(t, src.Regions[1], merged.Regions[1],
+		"merged region must not alias the source region pointer")
+
+	merged.Regions[1].Nodes[0] = &tailcfg.DERPNode{Name: "mutated"}
+	assert.Equal(t, "a", src.Regions[1].Nodes[0].Name,
+		"source region was mutated through a shared pointer")
+}
@@ -158,11 +158,12 @@ func (e *ExtraRecordsMan) updateRecords() {
 	}

 	e.mu.Lock()
-	defer e.mu.Unlock()

 	// If there has not been any change, ignore the update.
 	if oldHash, ok := e.hashes[e.path]; ok {
 		if newHash == oldHash {
+			e.mu.Unlock()
+
 			return
 		}
 	}
@@ -171,10 +172,19 @@ func (e *ExtraRecordsMan) updateRecords() {

 	e.records = set.SetOf(records)
 	e.hashes[e.path] = newHash
+	toSend := e.records.Slice()

 	log.Trace().Caller().Interface("records", e.records).Msgf("extra records updated from path, count old: %d, new: %d", oldCount, e.records.Len())

-	e.updateCh <- e.records.Slice()
+	// Release the lock before the (potentially blocking) send so a slow or
+	// absent consumer cannot stall Records() readers, and abort the send on
+	// shutdown instead of leaking this goroutine on the closed-down channel.
+	e.mu.Unlock()
+
+	select {
+	case e.updateCh <- toSend:
+	case <-e.closeCh:
+	}
 }

 // readExtraRecordsFromPath reads a JSON file of [tailcfg.DNSRecord]
@@ -0,0 +1,45 @@
+package dns
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+// TestUpdateRecordsDoesNotBlockShutdown ensures updateRecords does not park
+// forever on the update channel during shutdown. The send must release the
+// write lock first and abort on closeCh, otherwise the Run goroutine leaks and
+// holds the lock indefinitely when no consumer is draining the channel.
+func TestUpdateRecordsDoesNotBlockShutdown(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "extra.json")
+	require.NoError(t, os.WriteFile(path,
+		[]byte(`[{"name":"a.example.com","type":"A","value":"100.64.0.1"}]`), 0o600))
+
+	er, err := NewExtraRecordsManager(path)
+	require.NoError(t, err)
+
+	defer er.watcher.Close()
+
+	// Change the file so updateRecords passes the unchanged-hash guard and
+	// reaches the send with no consumer draining UpdateCh.
+	require.NoError(t, os.WriteFile(path,
+		[]byte(`[{"name":"b.example.com","type":"A","value":"100.64.0.2"}]`), 0o600))
+
+	done := make(chan struct{})
+
+	go func() {
+		er.updateRecords()
+		close(done)
+	}()
+
+	er.Close()
+
+	select {
+	case <-done:
+	case <-time.After(2 * time.Second):
+		t.Fatal("updateRecords parked on a blocking send and did not return after Close")
+	}
+}
@@ -19,17 +19,6 @@ import (
 )

 const (
-	// NoiseCapabilityVersion is used by Tailscale clients to indicate
-	// their codebase version. Tailscale clients can communicate over TS2021
-	// from CapabilityVersion 28, but we only have good support for it
-	// since https://github.com/tailscale/tailscale/pull/4323 (Noise in any HTTPS port).
-	//
-	// Related to this change, there is https://github.com/tailscale/tailscale/pull/5379,
-	// where CapabilityVersion 39 is introduced to indicate #4323 was merged.
-	//
-	// See also https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go
-	NoiseCapabilityVersion = 39
-
 	reservedResponseHeaderSize = 4
 )

@@ -202,21 +191,28 @@ func (h *Headscale) KeyHandler(
 		return
 	}

-	// TS2021 (Tailscale v2 protocol) requires to have a different key
-	if capVer >= NoiseCapabilityVersion {
-		resp := tailcfg.OverTLSPublicKeyResponse{
-			PublicKey: h.noisePrivateKey.Public(),
-		}
-
-		writer.Header().Set("Content-Type", "application/json")
-
-		err := json.NewEncoder(writer).Encode(resp)
-		if err != nil {
-			log.Error().Err(err).Msg("failed to encode public key response")
-		}
-
+	// Only disclose the Noise public key to clients this server can
+	// actually complete a handshake with. Gating on the same floor the
+	// Noise handshake enforces (capver.MinSupportedCapabilityVersion, see
+	// isSupportedVersion in noise.go) keeps /key consistent with /ts2021:
+	// versions the handshake would reject get a clear rejection here
+	// instead of a key that only serves as a version-boundary oracle.
+	// See https://github.com/juanfont/headscale/issues/3380.
+	if !isSupportedVersion(capVer) {
+		httpError(writer, NewHTTPError(http.StatusBadRequest, "unsupported client version", unsupportedClientError(capVer)))
 		return
 	}
+
+	resp := tailcfg.OverTLSPublicKeyResponse{
+		PublicKey: h.noisePrivateKey.Public(),
+	}
+
+	writer.Header().Set("Content-Type", "application/json")
+
+	err = json.NewEncoder(writer).Encode(resp)
+	if err != nil {
+		log.Error().Err(err).Msg("failed to encode public key response")
+	}
 }

 func (h *Headscale) HealthHandler(
@@ -4,12 +4,15 @@ import (
 	"bytes"
 	"context"
 	"errors"
+	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"strings"
 	"testing"

+	"github.com/juanfont/headscale/hscontrol/capver"
 	"github.com/stretchr/testify/assert"
+	"tailscale.com/types/key"
 )

 var errTestUnexpected = errors.New("unexpected failure")
@@ -47,6 +50,52 @@ func TestHandleVerifyRequest_OversizedBodyRejected(t *testing.T) {
 		"oversized body must surface 413")
 }

+// TestKeyHandler_UnsupportedCapVerDoesNotLeakKey reproduces
+// https://github.com/juanfont/headscale/issues/3380. The /key handler
+// must gate key disclosure on the same floor the Noise handshake
+// enforces (capver.MinSupportedCapabilityVersion). A capability version
+// below that floor can never complete a handshake, so it must be
+// rejected rather than handed the server's Noise public key, which would
+// otherwise serve only as a fingerprint / version-boundary oracle.
+func TestKeyHandler_UnsupportedCapVerDoesNotLeakKey(t *testing.T) {
+	t.Parallel()
+
+	noise := key.NewMachine()
+	h := &Headscale{noisePrivateKey: &noise}
+
+	unsupported := capver.MinSupportedCapabilityVersion - 1
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequestWithContext(
+		context.Background(),
+		http.MethodGet,
+		fmt.Sprintf("/key?v=%d", unsupported),
+		nil,
+	)
+
+	h.KeyHandler(rec, req)
+
+	assert.Equal(t, http.StatusBadRequest, rec.Code,
+		"a client below the supported floor must be rejected")
+	assert.NotContains(t, rec.Body.String(), noise.Public().String(),
+		"must not disclose Noise public key to a client below the supported floor")
+
+	// A supported client still receives the key.
+	recOK := httptest.NewRecorder()
+	reqOK := httptest.NewRequestWithContext(
+		context.Background(),
+		http.MethodGet,
+		fmt.Sprintf("/key?v=%d", capver.MinSupportedCapabilityVersion),
+		nil,
+	)
+
+	h.KeyHandler(recOK, reqOK)
+
+	assert.Equal(t, http.StatusOK, recOK.Code)
+	assert.Contains(t, recOK.Body.String(), noise.Public().String(),
+		"a supported client must receive the Noise public key")
+}
+
 // errorAsHTTPError is a small local helper that unwraps an [HTTPError]
 // from an error chain.
 func errorAsHTTPError(err error) (HTTPError, bool) {
@@ -0,0 +1,47 @@
+package mapper
+
+import (
+	"testing"
+	"time"
+
+	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/juanfont/headscale/hscontrol/types/change"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestProcessBatchedChangesCoalescesWhenInFlight verifies that at most one
+// batched bundle per node is queued at a time. While a node's bundle is in
+// flight, a new tick's changes must stay in pending (coalesced) rather than
+// being queued as a second bundle that a non-FIFO worker could deliver out of
+// order.
+func TestProcessBatchedChangesCoalescesWhenInFlight(t *testing.T) {
+	b := NewBatcher(50*time.Millisecond, 2, nil) // not started: no ticker, no workers
+
+	id := types.NodeID(1)
+	nc := newMultiChannelNodeConn(id, nil)
+	b.nodes.Store(id, nc)
+
+	// A bundle is in flight: the new change must be retained, not queued.
+	nc.inFlight.Store(true)
+	nc.appendPending(change.PolicyChange())
+	b.processBatchedChanges()
+
+	nc.pendingMu.Lock()
+	retained := len(nc.pending)
+	nc.pendingMu.Unlock()
+	assert.Equal(t, 1, retained, "pending must be retained while a bundle is in flight")
+
+	// No bundle in flight: the pending change is queued and the node marked
+	// in-flight.
+	nc.inFlight.Store(false)
+	b.processBatchedChanges()
+
+	nc.pendingMu.Lock()
+	drained := len(nc.pending)
+	nc.pendingMu.Unlock()
+	assert.Equal(t, 0, drained, "pending must be drained once queued")
+	assert.True(t, nc.inFlight.Load(), "queued bundle must mark the node in-flight")
+
+	require.NotNil(t, b)
+}
@@ -280,18 +280,36 @@ func (b *Batcher) AddNode(
 		created: now,
 		stop:    stop,
 	}
+	// Block broadcast sends to this connection until its initial map
+	// is delivered below, so a delta cannot become the stream's first
+	// frame — clients reject streams whose first frame lacks the self
+	// node.
+	newEntry.pendingInitial.Store(true)
 	// Initialize last used timestamp
 	newEntry.lastUsed.Store(now.Unix())

-	// Get or create multiChannelNodeConn - this reuses existing offline nodes for rapid reconnection
-	nodeConn, loaded := b.nodes.LoadOrStore(id, newMultiChannelNodeConn(id, b.mapper))
+	// Get or create the multiChannelNodeConn and register this connection in a
+	// single Compute so the new connection is visible atomically. Doing the
+	// LoadOrStore and addConnection as separate steps let cleanupOfflineNodes
+	// (which deletes via Compute when hasActiveConnections() is false) observe a
+	// reused offline conn with zero connections mid-reconnect and delete it,
+	// orphaning the live connection.
+	var nodeConn *multiChannelNodeConn

-	if !loaded {
-		b.totalNodes.Add(1)
-	}
+	b.nodes.Compute(
+		id,
+		func(existing *multiChannelNodeConn, loaded bool) (*multiChannelNodeConn, xsync.ComputeOp) {
+			if !loaded || existing == nil {
+				existing = newMultiChannelNodeConn(id, b.mapper)
+				b.totalNodes.Add(1)
+			}

-	// Add connection to the list (lock-free)
-	nodeConn.addConnection(newEntry)
+			existing.addConnection(newEntry)
+			nodeConn = existing
+
+			return existing, xsync.UpdateOp
+		},
+	)

 	// Use the worker pool for controlled concurrency instead of direct generation
 	initialMap, err := b.MapResponseFromChange(id, change.FullSelf(id))
@@ -310,7 +328,17 @@ func (b *Batcher) AddNode(
 	// and we want to avoid the race condition where the receiver isn't ready yet
 	select {
 	case c <- initialMap:
-		// Success
+		// Record sent peers only after confirmed delivery, mirroring the async
+		// path, and under workMu so a concurrent async bundle for this node
+		// cannot interleave its own lastSentPeers update.
+		nodeConn.workMu.Lock()
+		nodeConn.updateSentPeers(initialMap)
+		nodeConn.workMu.Unlock()
+
+		// Open the connection for broadcast sends now that the initial
+		// map is the stream's first frame; send() requeued any changes
+		// that arrived in the meantime.
+		newEntry.pendingInitial.Store(false)
 	case <-time.After(5 * time.Second): //nolint:mnd
 		nlog.Error().Err(ErrInitialMapSendTimeout).Msg("initial map send timeout")
 		nlog.Debug().Caller().Dur("timeout.duration", 5*time.Second). //nolint:mnd
@@ -483,9 +511,11 @@ func (b *Batcher) worker(workerID int) {
 							Uint64(zf.NodeID, w.nodeID.Uint64()).
 							Str(zf.Reason, w.changes[0].Reason).
 							Msg("failed to generate map response for synchronous work")
-					} else if result.mapResponse != nil {
-						nc.updateSentPeers(result.mapResponse)
 					}
+					// Peer tracking is recorded by the caller (AddNode) only
+					// after the initial map is actually delivered; recording it
+					// here, before delivery, would leave phantom lastSentPeers
+					// if the send times out.

 					nc.workMu.Unlock()
 				} else {
@@ -512,9 +542,24 @@ func (b *Batcher) worker(workerID int) {
 			// finish — preventing out-of-order delivery and races
 			// on lastSentPeers (Clear+Store vs Range).
 			if nc, exists := b.nodes.Load(w.nodeID); exists && nc != nil {
+				// Changes that found only connections still awaiting
+				// their initial map are retried next tick: the
+				// in-flight initial map may have been generated from
+				// a snapshot older than the change, so dropping them
+				// would lose updates. Collected and prepended as a
+				// group to keep their order ahead of newer pending
+				// changes — order matters for stateful patches like
+				// online/offline.
+				var retry []change.Change
+
 				nc.workMu.Lock()
 				for _, ch := range w.changes {
 					err := nc.change(ch)
+					if errors.Is(err, errNoReadyConnections) {
+						retry = append(retry, ch)
+						continue
+					}
+
 					if err != nil {
 						b.workErrors.Add(1)
 						wlog.Error().Err(err).
@@ -524,6 +569,13 @@ func (b *Batcher) worker(workerID int) {
 					}
 				}
 				nc.workMu.Unlock()
+
+				if len(retry) > 0 {
+					nc.prependPending(retry...)
+				}
+
+				// Bundle delivered; allow the next tick's bundle to queue.
+				nc.inFlight.Store(false)
 			}
 		case <-b.done:
 			wlog.Debug().Msg("batcher shutting down, exiting worker")
@@ -625,14 +677,24 @@ func (b *Batcher) processBatchedChanges() {
 			return true
 		}

+		// Only one batched bundle per node may be in flight at a time. If the
+		// previous tick's bundle is still queued or processing, leave this
+		// tick's changes in pending; they are picked up once it completes. This
+		// keeps delivery ordered even when the worker pool is saturated.
+		if nc.inFlight.Load() {
+			return true
+		}
+
 		pending := nc.drainPending()
 		if len(pending) == 0 {
 			return true
 		}

+		// One policy recompute rebuilds the whole netmap; drop same-tick repeats.
+		pending = change.DedupePolicyChanges(pending)
+
 		// Queue a single work item containing all pending changes.
-		// One item per node ensures a single worker processes them
-		// sequentially, preventing out-of-order delivery.
+		nc.inFlight.Store(true)
 		b.queueWork(work{changes: pending, nodeID: nodeID, resultCh: nil})

 		return true
@@ -1104,6 +1104,72 @@ func TestBatcherWorkQueueBatching(t *testing.T) {
 	}
 }

+// TestBatcherCoalescesPolicyRecomputesPerTick proves that many identical
+// broadcast policy changes arriving in a single batcher tick collapse to one
+// runtime peer recompute per node. Without coalescing, each PolicyChange drives
+// a separate full netmap rebuild for every connected node (the reconnect-storm
+// fan-out); with it, a node sees at most one recompute per tick.
+func TestBatcherCoalescesPolicyRecomputesPerTick(t *testing.T) {
+	for _, bf := range allBatcherFunctions {
+		t.Run(bf.name, func(t *testing.T) {
+			const (
+				nodesPerUser         = 4
+				policyChangesPerTick = 8
+			)
+
+			testData, cleanup := setupBatcherWithTestData(t, bf.fn, 1, nodesPerUser, 100)
+			defer cleanup()
+
+			batcher := testData.Batcher
+			for i := range testData.Nodes {
+				n := &testData.Nodes[i]
+				require.NoError(t, batcher.AddNode(n.n.ID, n.ch, tailcfg.CapabilityVersion(100), nil))
+			}
+
+			// Many identical broadcast policy changes, then a DERP-map change as
+			// a sentinel. All land in one tick; the sentinel rides the same work
+			// item after the recompute(s), so its arrival marks the end of this
+			// tick's policy responses for a node.
+			for range policyChangesPerTick {
+				batcher.AddWork(change.PolicyChange())
+			}
+
+			batcher.AddWork(change.DERPMap())
+
+			for i := range testData.Nodes {
+				id := testData.Nodes[i].n.ID
+				ch := testData.Nodes[i].ch
+
+				policyResponses := 0
+				deadline := time.After(2 * time.Second)
+
+			drain:
+				for {
+					select {
+					case resp := <-ch:
+						switch {
+						case resp.DERPMap != nil && len(resp.Peers) == 0:
+							// Sentinel: every policy recompute for this tick has
+							// already been delivered to this node.
+							break drain
+						case len(resp.PacketFilters) > 0 && len(resp.Peers) == 0:
+							// A runtime peer recompute (policyChangeResponse):
+							// packet filters and incremental peers, no full list.
+							policyResponses++
+						}
+					case <-deadline:
+						t.Fatalf("node %d never received the DERP sentinel", id)
+					}
+				}
+
+				assert.LessOrEqualf(t, policyResponses, 1,
+					"node %d received %d policy recomputes in one tick; identical recomputes must coalesce to one",
+					id, policyResponses)
+			}
+		})
+	}
+}
+
 // TestBatcherWorkerChannelSafety tests that worker goroutines handle closed
 // channels safely without panicking when processing work items.
 //
@@ -9,6 +9,8 @@ import (
 	"github.com/juanfont/headscale/hscontrol/policy"
 	policyv2 "github.com/juanfont/headscale/hscontrol/policy/v2"
 	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/juanfont/headscale/hscontrol/util/zlog/zf"
+	"github.com/rs/zerolog/log"
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/views"
 	"tailscale.com/util/multierr"
@@ -144,7 +146,15 @@ func (b *MapResponseBuilder) WithSSHPolicy() *MapResponseBuilder {

 	sshPolicy, err := b.mapper.state.SSHPolicy(node)
 	if err != nil {
-		b.addError(err)
+		// SSH policy is optional for a node to function. Rather than fail the
+		// whole map (leaving the node unable to connect), log and continue
+		// without it; the node still receives a usable netmap.
+		log.Warn().Caller().
+			Err(err).
+			Uint64(zf.NodeID, node.ID().Uint64()).
+			Str(zf.NodeHostname, node.Hostname()).
+			Msg("building map response: skipping SSH policy for node; node will receive a map without SSH rules")
+
 		return b
 	}

@@ -279,7 +289,19 @@ func (b *MapResponseBuilder) buildTailPeers(peers views.Slice[types.NodeView]) (
 			return b.mapper.state.RoutesForPeer(node, peer, matchers)
 		}, b.mapper.cfg, allCapMaps[peer.ID()])
 		if err != nil {
-			return nil, err
+			// One peer with invalid data (e.g. an empty or over-long
+			// GivenName that fails GetFQDN) must not blank out the map for
+			// every node that can see it. Drop the offending peer, log it
+			// with the identity an operator needs to fix it, and keep
+			// building from the remaining valid peers.
+			log.Warn().Caller().
+				Err(err).
+				Uint64(zf.NodeID, peer.ID().Uint64()).
+				Str(zf.NodeHostname, peer.Hostname()).
+				Uint64("map.viewer.node.id", b.nodeID.Uint64()).
+				Msgf("dropping peer %d from map response: invalid node data; fix with `headscale nodes rename %d <name>`", peer.ID(), peer.ID())
+
+			continue
 		}

 		// [tailcfg.Node.CapMap] on a peer carries the small set of
@@ -0,0 +1,60 @@
+package mapper
+
+import (
+	"sync"
+	"testing"
+
+	"github.com/juanfont/headscale/hscontrol/types"
+	"tailscale.com/tailcfg"
+)
+
+// TestExtraRecordsConcurrentUpdateNoRace exercises the extra-records watcher
+// write path (Config.SetExtraRecords) concurrently with per-client DNS config
+// builds (generateDNSConfig -> Config.CloneTailcfgDNSConfig). Both must go
+// through the shared lock so the run is race-free under -race.
+func TestExtraRecordsConcurrentUpdateNoRace(t *testing.T) {
+	uid := uint(1)
+	cfg := &types.Config{
+		TailcfgDNSConfig: &tailcfg.DNSConfig{
+			ExtraRecords: []tailcfg.DNSRecord{
+				{Name: "initial.example.com", Type: "A", Value: "100.64.0.1"},
+			},
+		},
+	}
+
+	node := (&types.Node{
+		Hostname: "race-node",
+		UserID:   &uid,
+		User:     &types.User{Name: "racer"},
+	}).View()
+
+	const iterations = 2000
+
+	var wg sync.WaitGroup
+
+	// Writer: the extra-records update path.
+	wg.Go(func() {
+		for i := range iterations {
+			recs := []tailcfg.DNSRecord{{Name: "a.example.com", Type: "A", Value: "100.64.0.2"}}
+			if i%2 == 0 {
+				recs = append(recs, tailcfg.DNSRecord{Name: "b.example.com", Type: "A", Value: "100.64.0.3"})
+			}
+
+			cfg.SetExtraRecords(recs)
+		}
+	})
+
+	// Readers: the per-client map build path.
+	const readers = 8
+	for range readers {
+		wg.Go(func() {
+			for range iterations {
+				if d := generateDNSConfig(cfg, node, nil); d != nil {
+					_ = len(d.ExtraRecords)
+				}
+			}
+		})
+	}
+
+	wg.Wait()
+}
@@ -0,0 +1,132 @@
+package mapper
+
+import (
+	"errors"
+	"testing"
+	"time"
+
+	"github.com/juanfont/headscale/hscontrol/types/change"
+	"tailscale.com/tailcfg"
+)
+
+// TestUnreadyConnectionDefersBroadcastsUntilInitialMap pins the ordering fix
+// for the "initial MapResponse lacked Node" client failure: a connection
+// registered by [Batcher.AddNode] but still waiting for its initial map must
+// not receive broadcast deltas — a delta as the stream's first frame makes the
+// Tailscale client tear down the poll. The change is requeued, not dropped,
+// because the in-flight initial map may have been generated from a snapshot
+// older than the change.
+func TestUnreadyConnectionDefersBroadcastsUntilInitialMap(t *testing.T) {
+	testData, cleanup := setupBatcherWithTestData(t, NewBatcherAndMapper, 1, 2, normalBufferSize)
+	defer cleanup()
+
+	batcher := testData.Batcher.Batcher
+	peerNode := &testData.Nodes[0]
+	targetNode := &testData.Nodes[1]
+
+	// Register the target's connection by hand in the state AddNode leaves it
+	// in between registering the channel and delivering the initial map.
+	nc := newMultiChannelNodeConn(targetNode.n.ID, batcher.mapper)
+	entry := &connectionEntry{
+		id:      "test-unready",
+		c:       targetNode.ch,
+		version: tailcfg.CapabilityVersion(100),
+		created: time.Now(),
+	}
+	entry.pendingInitial.Store(true)
+	nc.addConnection(entry)
+	batcher.nodes.Store(targetNode.n.ID, nc)
+
+	// A broadcast lands while the initial map is still in flight: nothing may
+	// reach the channel, and the caller must be told to retry
+	// (the worker prepends such changes back onto pending).
+	retryChange := change.NodeAdded(peerNode.n.ID)
+
+	err := nc.change(retryChange)
+	if !errors.Is(err, errNoReadyConnections) {
+		t.Fatalf("change on unready connection: want errNoReadyConnections, got %v", err)
+	}
+
+	select {
+	case resp := <-targetNode.ch:
+		t.Fatalf("unready connection received a frame before its initial map: %+v", resp)
+	default:
+	}
+
+	// Once the initial map is delivered, the retried change goes out.
+	entry.pendingInitial.Store(false)
+
+	err = nc.change(retryChange)
+	if err != nil {
+		t.Fatalf("change on ready connection: %v", err)
+	}
+
+	select {
+	case resp := <-targetNode.ch:
+		if len(resp.PeersChanged) == 0 {
+			t.Fatalf("expected PeersChanged delta after readiness, got %+v", resp)
+		}
+	default:
+		t.Fatal("ready connection did not receive the retried change")
+	}
+}
+
+// TestSyncInitialMapNoPhantomPeersOnTimeout ensures the synchronous initial-map
+// path does not record peers as sent until the map is actually delivered. When
+// the AddNode channel send times out, the client received nothing, so
+// lastSentPeers must stay empty; otherwise future computePeerDiff calculations
+// miss peer additions or removals after reconnect.
+func TestSyncInitialMapNoPhantomPeersOnTimeout(t *testing.T) {
+	testData, cleanup := setupBatcherWithTestData(t, NewBatcherAndMapper, 1, 2, normalBufferSize)
+	defer cleanup()
+
+	batcher := testData.Batcher.Batcher
+	state := testData.State
+
+	peerNode := &testData.Nodes[0]
+	targetNode := &testData.Nodes[1]
+
+	state.Connect(peerNode.n.ID)
+
+	err := batcher.AddNode(peerNode.n.ID, peerNode.ch, tailcfg.CapabilityVersion(100), nil)
+	if err != nil {
+		t.Fatalf("adding peer node: %v", err)
+	}
+
+	go func() {
+		for range peerNode.ch {
+		}
+	}()
+
+	state.Connect(targetNode.n.ID)
+
+	// Unbuffered channel that nobody reads: AddNode blocks on the initial-map
+	// send and times out.
+	unreadCh := make(chan *tailcfg.MapResponse)
+
+	err = batcher.AddNode(targetNode.n.ID, unreadCh, tailcfg.CapabilityVersion(100), nil)
+	if err == nil {
+		t.Fatal("expected initial-map send timeout error, got nil")
+	}
+
+	nc, exists := batcher.nodes.Load(targetNode.n.ID)
+	if !exists || nc == nil {
+		t.Fatalf("expected node %d to be retained in b.nodes", targetNode.n.ID)
+	}
+
+	if nc.hasActiveConnections() {
+		t.Fatalf("expected node %d to have no active connections after timeout", targetNode.n.ID)
+	}
+
+	var phantom []tailcfg.NodeID
+
+	nc.lastSentPeers.Range(func(id tailcfg.NodeID, _ struct{}) bool {
+		phantom = append(phantom, id)
+		return true
+	})
+
+	if len(phantom) != 0 {
+		t.Errorf("lastSentPeers must be empty after a failed initial-map delivery, got %d: %v",
+			len(phantom), phantom)
+	}
+}
@@ -0,0 +1,189 @@
+//go:build !race
+
+// This is a timing-sensitive performance regression test; the race detector's
+// ~10x slowdown makes its wall-clock assertion meaningless, so it is excluded
+// from -race builds. The concurrency correctness of the policy lock change it
+// guards is covered under -race by TestPolicyManagerConcurrentReads in
+// hscontrol/policy/v2.
+
+package mapper
+
+import (
+	"net/netip"
+	"runtime"
+	"slices"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/juanfont/headscale/hscontrol/db"
+	"github.com/juanfont/headscale/hscontrol/derp"
+	"github.com/juanfont/headscale/hscontrol/state"
+	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"tailscale.com/tailcfg"
+)
+
+// setupStormBatcher builds a real state+batcher with production-default
+// NodeStore batching so the reconnect-storm contention is realistic. It mirrors
+// setupBatcherWithTestData but lets the test control BatcherWorkers and the
+// policy.
+func setupStormBatcher(tb testing.TB, nodeCount, workers int, policy string) (*TestData, func()) {
+	tb.Helper()
+
+	tmpDir := tb.TempDir()
+	prefixV4 := netip.MustParsePrefix("100.64.0.0/10")
+	prefixV6 := netip.MustParsePrefix("fd7a:115c:a1e0::/48")
+
+	cfg := &types.Config{
+		Database: types.DatabaseConfig{
+			Type:   types.DatabaseSqlite,
+			Sqlite: types.SqliteConfig{Path: tmpDir + "/headscale_test.db"},
+		},
+		PrefixV4:     &prefixV4,
+		PrefixV6:     &prefixV6,
+		IPAllocation: types.IPAllocationStrategySequential,
+		BaseDomain:   "headscale.test",
+		Policy:       types.PolicyConfig{Mode: types.PolicyModeDB},
+		DERP: types.DERPConfig{
+			ServerEnabled: false,
+			DERPMap: &tailcfg.DERPMap{
+				Regions: map[int]*tailcfg.DERPRegion{999: {RegionID: 999}},
+			},
+		},
+		Tuning: types.Tuning{
+			BatchChangeDelay: 10 * time.Millisecond,
+			BatcherWorkers:   workers,
+			// Production defaults: coalesce writes so the storm is not
+			// exaggerated by an unrealistically small NodeStore batch.
+			NodeStoreBatchSize:    100,
+			NodeStoreBatchTimeout: 500 * time.Millisecond,
+		},
+	}
+
+	database, err := db.NewHeadscaleDatabase(cfg)
+	require.NoError(tb, err)
+
+	users := database.CreateUsersForTest(1, "testuser")
+	dbNodes := database.CreateRegisteredNodesForTest(users[0], nodeCount, "node")
+
+	allNodes := make([]node, 0, nodeCount)
+	for i := range dbNodes {
+		allNodes = append(allNodes, node{
+			n:  dbNodes[i],
+			ch: make(chan *tailcfg.MapResponse, normalBufferSize),
+		})
+	}
+
+	st, err := state.NewState(cfg)
+	require.NoError(tb, err)
+
+	derpMap, err := derp.GetDERPMap(cfg.DERP)
+	require.NoError(tb, err)
+	st.SetDERPMap(derpMap)
+
+	_, err = st.SetPolicy([]byte(policy))
+	require.NoError(tb, err)
+
+	batcher := wrapBatcherForTest(NewBatcherAndMapper(cfg, st), st)
+	batcher.Start()
+
+	td := &TestData{
+		Database: database,
+		Users:    users,
+		Nodes:    allNodes,
+		State:    st,
+		Config:   cfg,
+		Batcher:  batcher,
+	}
+
+	return td, func() {
+		batcher.Close()
+		st.Close()
+		database.Close()
+	}
+}
+
+// TestInitialMapNotStarvedByReconnectStorm reproduces juanfont/headscale#3346.
+//
+// When every node redials at once (e.g. after a server upgrade restart), each
+// connection writes the NodeStore (UpdateNodeFromMapRequest + Connect) and the
+// batcher generates its initial map. All of that reads the policy through the
+// PolicyManager. Before the fix the PolicyManager guarded every read with a
+// single exclusive mutex, so the NodeStore writer's O(n^2) BuildPeerMap and
+// every node's FilterForNode serialised against each other. On a per-node
+// filter policy (autogroup:self, via, relay grants) each hold is expensive, so
+// under the storm time-to-initial-map grew without bound.
+//
+// On the production server in #3346 this drove the batcher's per-node
+// total.duration from ~4s to ~76s; tailscale clients aborted the map POST
+// first and reported
+//
+//	PollNetMap: Post ".../machine/map": unexpected EOF
+//
+// then redialled, feeding the storm so it never converged. An allow-all policy
+// does NOT reproduce this — BuildPeerMap is cheap there; the per-node filter
+// path is what makes it expensive, matching a real deployment's ACLs.
+//
+// The fix makes PolicyManager reads take a shared RLock so map generation runs
+// concurrently. AddNode blocks until the initial map is generated and handed to
+// the node channel, so its wall-clock duration is the time-to-initial-map the
+// client experiences. Without the fix this test's slowest node takes ~10s+ at
+// this scale (lock-bound, and more workers do not help); with it, generation
+// parallelises across workers and stays well within a client's patience.
+func TestInitialMapNotStarvedByReconnectStorm(t *testing.T) {
+	if testing.Short() {
+		t.Skip("timing-sensitive storm regression; skipped in -short")
+	}
+
+	const (
+		nodeCount = 300
+
+		// A per-node-filter policy: forces BuildPeerMap and FilterForNode onto
+		// the slow path that recompiles filter rules per node, the same shape
+		// as a real ACL using autogroup:self / via / relay grants.
+		perNodeFilterPolicy = `{"acls":[{"action":"accept","src":["autogroup:member"],"dst":["autogroup:self:*"]}]}`
+
+		// Deliberately roomy so it passes on CI's few-core runners, where the
+		// single-writer BuildPeerMap sets the floor (~10s) whatever the reads
+		// do. It still trips on a hang or a return to the ~76s serialised
+		// behaviour; the fine-grained concurrency is verified separately by
+		// TestPolicyManagerConcurrentReads under -race.
+		maxAcceptableLatency = 30 * time.Second
+	)
+
+	// Use the real available parallelism, as production does.
+	workers := runtime.NumCPU()
+
+	td, cleanup := setupStormBatcher(t, nodeCount, workers, perNodeFilterPolicy)
+	defer cleanup()
+
+	latencies := make([]time.Duration, nodeCount)
+
+	var wg sync.WaitGroup
+
+	for i := range td.Nodes {
+		wg.Go(func() {
+			n := &td.Nodes[i]
+
+			start := time.Now()
+			err := td.Batcher.AddNode(n.n.ID, n.ch, tailcfg.CapabilityVersion(100), nil)
+			latencies[i] = time.Since(start)
+
+			assert.NoError(t, err) //nolint:testifylint // assert (not require) is correct off the test goroutine
+		})
+	}
+
+	wg.Wait()
+
+	slices.Sort(latencies)
+	p50 := latencies[len(latencies)/2]
+	p95 := latencies[len(latencies)*95/100]
+	maxLatency := latencies[len(latencies)-1]
+	t.Logf("initial-map latency over %d nodes (workers=%d): p50=%s p95=%s max=%s",
+		nodeCount, workers, p50, p95, maxLatency)
+
+	require.Less(t, maxLatency, maxAcceptableLatency,
+		"slowest initial map took %s: policy reads are serialising instead of running concurrently (issue #3346)", maxLatency)
+}
@@ -13,6 +13,7 @@ import (
 	"strings"
 	"time"

+	"github.com/juanfont/headscale/hscontrol/policy"
 	"github.com/juanfont/headscale/hscontrol/state"
 	"github.com/juanfont/headscale/hscontrol/types"
 	"github.com/juanfont/headscale/hscontrol/types/change"
@@ -135,12 +136,11 @@ func generateDNSConfig(
 	node types.NodeView,
 	capMap tailcfg.NodeCapMap,
 ) *tailcfg.DNSConfig {
-	if cfg.TailcfgDNSConfig == nil {
+	dnsConfig := cfg.CloneTailcfgDNSConfig()
+	if dnsConfig == nil {
 		return nil
 	}

-	dnsConfig := cfg.TailcfgDNSConfig.Clone()
-
 	profile := nextDNSProfileFromCapMap(capMap)
 	if profile != "" {
 		applyNextDNSProfile(dnsConfig.Resolvers, profile)
@@ -256,7 +256,13 @@ func addNextDNSMetadata(resolvers []*dnstype.Resolver, node types.NodeView) {

 		q := u.Query()
 		q.Set("device_name", node.Hostname())
-		q.Set("device_model", node.Hostinfo().OS())
+
+		// Guard Hostinfo().Valid() before dereferencing OS(): a node loaded
+		// from a legacy NULL host_info row has a nil Hostinfo, and OS() would
+		// panic. Mirrors the .Valid() guard in RequestTags/TailNode.
+		if node.Hostinfo().Valid() {
+			q.Set("device_model", node.Hostinfo().OS())
+		}

 		if ips := node.IPs(); len(ips) > 0 {
 			q.Set("device_ip", ips[0].String())
@@ -420,7 +426,7 @@ func (m *mapper) buildFromChange(
 	} else {
 		if len(resp.PeersChanged) > 0 {
 			peers := m.state.ListPeers(nodeID, resp.PeersChanged...)
-			builder.WithUserProfiles(peers)
+			builder.WithUserProfiles(m.filterVisibleNodes(nodeID, peers))
 			builder.WithPeerChanges(peers)
 		}

@@ -429,8 +435,9 @@ func (m *mapper) buildFromChange(
 		}
 	}

-	if len(resp.PeerPatches) > 0 {
-		builder.WithPeerChangedPatch(resp.PeerPatches)
+	patches := m.filterVisiblePeerPatches(nodeID, resp.PeerPatches)
+	if len(patches) > 0 {
+		builder.WithPeerChangedPatch(patches)
 	}

 	if resp.PingRequest != nil {
@@ -440,6 +447,100 @@ func (m *mapper) buildFromChange(
 	return builder.Build()
 }

+// visiblePeerIDs returns the set of peer node IDs the recipient may see under
+// the current policy. It is the single visibility decision shared by the
+// incremental peer-change and user-profile paths, computed from the same live
+// per-node matchers and [policy.ReduceNodes] filter that
+// [MapResponseBuilder.buildTailPeers] applies to full peer objects, so the
+// paths cannot drift. The snapshot peer map ([NodeStore.ListPeers]) is used
+// only as the candidate set, matching buildTailPeers; the live policy decides
+// visibility because the snapshot is not rebuilt on policy changes.
+//
+// ok is false when the node or its matchers cannot be resolved; callers must
+// then fail closed (emit nothing) rather than risk leaking forbidden peers.
+func (m *mapper) visiblePeerIDs(nodeID types.NodeID) (map[tailcfg.NodeID]struct{}, bool) {
+	node, ok := m.state.GetNodeByID(nodeID)
+	if !ok {
+		return nil, false
+	}
+
+	matchers, err := m.state.MatchersForNode(node)
+	if err != nil {
+		return nil, false
+	}
+
+	peers := m.state.ListPeers(nodeID)
+
+	// No matchers means no policy restrictions, so every peer is visible —
+	// the same default buildTailPeers applies.
+	if len(matchers) > 0 {
+		peers = policy.ReduceNodes(node, peers, matchers)
+	}
+
+	// Key by tailcfg.NodeID so the peer-patch path can look up by patch.NodeID
+	// directly, avoiding an unchecked int64->uint64 conversion.
+	visible := make(map[tailcfg.NodeID]struct{}, peers.Len())
+	for _, peer := range peers.All() {
+		visible[peer.ID().NodeID()] = struct{}{}
+	}
+
+	return visible, true
+}
+
+// filterVisiblePeerPatches drops peer-change patches whose target peer the
+// recipient cannot see under the ACL policy. Without it, online/offline,
+// endpoint, and key-expiry patches disclose the existence, presence, and
+// addresses of peers the recipient's policy forbids it from accessing.
+func (m *mapper) filterVisiblePeerPatches(
+	nodeID types.NodeID,
+	patches []*tailcfg.PeerChange,
+) []*tailcfg.PeerChange {
+	if len(patches) == 0 {
+		return patches
+	}
+
+	visible, ok := m.visiblePeerIDs(nodeID)
+	if !ok {
+		// Fail closed: if visibility cannot be resolved, send no patches.
+		return nil
+	}
+
+	var filtered []*tailcfg.PeerChange
+
+	for _, patch := range patches {
+		if _, vis := visible[patch.NodeID]; vis {
+			filtered = append(filtered, patch)
+		}
+	}
+
+	return filtered
+}
+
+// filterVisibleNodes restricts a peer slice to the nodes the recipient can see
+// under the ACL policy. It guards UserProfiles on the incremental PeersChanged
+// path, which receives an unfiltered node slice and would otherwise leak the
+// identities of users whose nodes the recipient cannot access.
+func (m *mapper) filterVisibleNodes(
+	nodeID types.NodeID,
+	peers views.Slice[types.NodeView],
+) views.Slice[types.NodeView] {
+	visible, ok := m.visiblePeerIDs(nodeID)
+	if !ok {
+		// Fail closed: emit no peer user profiles rather than risk a leak.
+		return views.SliceOf([]types.NodeView{})
+	}
+
+	var filtered []types.NodeView
+
+	for _, peer := range peers.All() {
+		if _, vis := visible[peer.ID().NodeID()]; vis {
+			filtered = append(filtered, peer)
+		}
+	}
+
+	return views.SliceOf(filtered)
+}
+
 func writeDebugMapResponse(
 	resp *tailcfg.MapResponse,
 	t debugType,
@@ -3,11 +3,17 @@ package mapper
 import (
 	"fmt"
 	"net/netip"
+	"strings"
 	"testing"

 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
+	"github.com/juanfont/headscale/hscontrol/db"
+	"github.com/juanfont/headscale/hscontrol/state"
 	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/juanfont/headscale/hscontrol/types/change"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/dnstype"
 )
@@ -193,3 +199,452 @@ func TestNextDNSCapMapRendering(t *testing.T) {
 		}
 	})
 }
+
+// TestBuildFromChangeFiltersPeerPatchesByVisibility proves that incremental
+// peer-change patches (online/offline, endpoint, key-expiry) are restricted to
+// the recipient's ACL-visible peer set, the same way buildTailPeers filters
+// full peer objects via policy.ReduceNodes. Without it, a node receives the
+// existence, presence, and addresses of peers its policy forbids accessing.
+func TestBuildFromChangeFiltersPeerPatchesByVisibility(t *testing.T) {
+	tmp := t.TempDir()
+
+	p4 := netip.MustParsePrefix("100.64.0.0/10")
+	p6 := netip.MustParsePrefix("fd7a:115c:a1e0::/48")
+
+	cfg := &types.Config{
+		Database: types.DatabaseConfig{
+			Type:   types.DatabaseSqlite,
+			Sqlite: types.SqliteConfig{Path: tmp + "/h.db"},
+		},
+		PrefixV4:     &p4,
+		PrefixV6:     &p6,
+		IPAllocation: types.IPAllocationStrategySequential,
+		BaseDomain:   "headscale.test",
+		Policy:       types.PolicyConfig{Mode: types.PolicyModeDB},
+		DERP: types.DERPConfig{
+			DERPMap: &tailcfg.DERPMap{
+				Regions: map[int]*tailcfg.DERPRegion{999: {RegionID: 999}},
+			},
+		},
+		Tuning: types.Tuning{
+			NodeStoreBatchSize:    state.TestBatchSize,
+			NodeStoreBatchTimeout: state.TestBatchTimeout,
+		},
+	}
+
+	database, err := db.NewHeadscaleDatabase(cfg)
+	require.NoError(t, err)
+
+	user1 := database.CreateUserForTest("u1")
+	user2 := database.CreateUserForTest("u2")
+	n1 := database.CreateRegisteredNodeForTest(user1, "n1")
+	n1b := database.CreateRegisteredNodeForTest(user1, "n1b")
+	n2 := database.CreateRegisteredNodeForTest(user2, "n2")
+	require.NoError(t, database.Close())
+
+	s, err := state.NewState(cfg)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = s.Close() })
+
+	// Each user may reach only its own devices, so n1 cannot access n2.
+	policy := `{"acls":[
+		{"action":"accept","src":["u1@"],"dst":["u1@:*"]},
+		{"action":"accept","src":["u2@"],"dst":["u2@:*"]}
+	]}`
+	_, err = s.SetPolicy([]byte(policy))
+	require.NoError(t, err)
+
+	m := &mapper{state: s, cfg: cfg}
+
+	// n2 (user2) comes online; n1 (user1) must NOT receive its patch.
+	leakChange := change.NodeOnline(n2.ID)
+	resp, err := m.buildFromChange(n1.ID, tailcfg.CurrentCapabilityVersion, &leakChange)
+	require.NoError(t, err)
+	require.NotNil(t, resp)
+
+	for _, p := range resp.PeersChangedPatch {
+		assert.NotEqual(t, n2.ID.NodeID(), p.NodeID,
+			"n1 must not receive an online patch for n2, which its policy forbids accessing")
+	}
+
+	// Control: n1b (same user) coming online IS visible to n1.
+	okChange := change.NodeOnline(n1b.ID)
+	resp2, err := m.buildFromChange(n1.ID, tailcfg.CurrentCapabilityVersion, &okChange)
+	require.NoError(t, err)
+	require.NotNil(t, resp2)
+
+	var gotVisible bool
+
+	for _, p := range resp2.PeersChangedPatch {
+		if p.NodeID == n1b.ID.NodeID() {
+			gotVisible = true
+		}
+	}
+
+	assert.True(t, gotVisible,
+		"n1 must receive the online patch for visible same-user peer n1b")
+}
+
+// TestBuildFromChangeFiltersUserProfilesByVisibility proves the incremental
+// PeersChanged path restricts UserProfiles to the recipient's ACL-visible
+// peers, like the full-map path (whose ListPeers returns the
+// BuildPeerMap-filtered set). Without it, a changed node broadcast to all
+// nodes leaks its owner's identity (login name, display name, avatar) to
+// recipients whose policy forbids accessing that node.
+func TestBuildFromChangeFiltersUserProfilesByVisibility(t *testing.T) {
+	tmp := t.TempDir()
+
+	p4 := netip.MustParsePrefix("100.64.0.0/10")
+	p6 := netip.MustParsePrefix("fd7a:115c:a1e0::/48")
+
+	cfg := &types.Config{
+		Database: types.DatabaseConfig{
+			Type:   types.DatabaseSqlite,
+			Sqlite: types.SqliteConfig{Path: tmp + "/h.db"},
+		},
+		PrefixV4:     &p4,
+		PrefixV6:     &p6,
+		IPAllocation: types.IPAllocationStrategySequential,
+		BaseDomain:   "headscale.test",
+		Policy:       types.PolicyConfig{Mode: types.PolicyModeDB},
+		DERP: types.DERPConfig{
+			DERPMap: &tailcfg.DERPMap{
+				Regions: map[int]*tailcfg.DERPRegion{999: {RegionID: 999}},
+			},
+		},
+		Tuning: types.Tuning{
+			NodeStoreBatchSize:    state.TestBatchSize,
+			NodeStoreBatchTimeout: state.TestBatchTimeout,
+		},
+	}
+
+	database, err := db.NewHeadscaleDatabase(cfg)
+	require.NoError(t, err)
+
+	user1 := database.CreateUserForTest("u1")
+	user2 := database.CreateUserForTest("u2")
+	n1 := database.CreateRegisteredNodeForTest(user1, "n1")
+	n2 := database.CreateRegisteredNodeForTest(user2, "n2")
+	require.NoError(t, database.Close())
+
+	s, err := state.NewState(cfg)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = s.Close() })
+
+	// Each user may reach only its own devices, so n1 cannot access n2.
+	policy := `{"acls":[
+		{"action":"accept","src":["u1@"],"dst":["u1@:*"]},
+		{"action":"accept","src":["u2@"],"dst":["u2@:*"]}
+	]}`
+	_, err = s.SetPolicy([]byte(policy))
+	require.NoError(t, err)
+
+	m := &mapper{state: s, cfg: cfg}
+
+	// n2 (user2) is added and broadcast. n1 (user1) cannot access it, so n1
+	// must NOT receive user2's profile.
+	c := change.NodeAdded(n2.ID)
+	resp, err := m.buildFromChange(n1.ID, tailcfg.CurrentCapabilityVersion, &c)
+	require.NoError(t, err)
+	require.NotNil(t, resp)
+
+	for _, up := range resp.UserProfiles {
+		assert.NotEqual(t, user2.TailscaleUserProfile().ID, up.ID,
+			"n1 must not receive user2's profile; n2 is not ACL-visible to n1")
+	}
+}
+
+// TestBuildFromChangeVisibilityMatchesFullMap is the consolidation guard for
+// PR #3304: the incremental change paths (peer patches via NodeOnline, changed
+// peers via NodeAdded) must expose exactly the same ACL-visible peer set as the
+// full-map path under every policy shape, and a cross-user UserProfile must not
+// leak. If a future refactor lets one path drift from another, this fails.
+//
+// It pins two behaviours the scattered per-path filters get wrong today and the
+// consolidation onto the snapshot peer map must fix: deny-all (empty matchers)
+// must hide every peer on the incremental path rather than fall open to "no
+// matchers => all visible", and per-node policies (autogroup:self) must agree
+// across paths.
+func TestBuildFromChangeVisibilityMatchesFullMap(t *testing.T) {
+	tmp := t.TempDir()
+	p4 := netip.MustParsePrefix("100.64.0.0/10")
+	p6 := netip.MustParsePrefix("fd7a:115c:a1e0::/48")
+	cfg := &types.Config{
+		Database: types.DatabaseConfig{
+			Type:   types.DatabaseSqlite,
+			Sqlite: types.SqliteConfig{Path: tmp + "/h.db"},
+		},
+		PrefixV4:     &p4,
+		PrefixV6:     &p6,
+		IPAllocation: types.IPAllocationStrategySequential,
+		BaseDomain:   "headscale.test",
+		Policy:       types.PolicyConfig{Mode: types.PolicyModeDB},
+		DERP: types.DERPConfig{
+			DERPMap: &tailcfg.DERPMap{
+				Regions: map[int]*tailcfg.DERPRegion{999: {RegionID: 999}},
+			},
+		},
+		Tuning: types.Tuning{
+			NodeStoreBatchSize:    state.TestBatchSize,
+			NodeStoreBatchTimeout: state.TestBatchTimeout,
+		},
+	}
+
+	database, err := db.NewHeadscaleDatabase(cfg)
+	require.NoError(t, err)
+
+	user1 := database.CreateUserForTest("u1")
+	user2 := database.CreateUserForTest("u2")
+	n1 := database.CreateRegisteredNodeForTest(user1, "n1")
+	n1b := database.CreateRegisteredNodeForTest(user1, "n1b")
+	n2 := database.CreateRegisteredNodeForTest(user2, "n2")
+	require.NoError(t, database.Close())
+
+	s, err := state.NewState(cfg)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = s.Close() })
+
+	m := &mapper{state: s, cfg: cfg}
+	capVer := tailcfg.CurrentCapabilityVersion
+
+	// fullVisible returns the peer IDs n1 sees in the full map.
+	fullVisible := func(t *testing.T) map[tailcfg.NodeID]bool {
+		t.Helper()
+
+		resp, err := m.fullMapResponse(n1.ID, capVer)
+		require.NoError(t, err)
+
+		got := map[tailcfg.NodeID]bool{}
+		for _, p := range resp.Peers {
+			got[p.ID] = true
+		}
+
+		return got
+	}
+	// patchReaches reports whether a NodeOnline patch for id is delivered to n1.
+	patchReaches := func(t *testing.T, id types.NodeID) bool {
+		t.Helper()
+
+		c := change.NodeOnline(id)
+		resp, err := m.buildFromChange(n1.ID, capVer, &c)
+		require.NoError(t, err)
+
+		if resp == nil {
+			return false
+		}
+
+		for _, p := range resp.PeersChangedPatch {
+			if p.NodeID == id.NodeID() {
+				return true
+			}
+		}
+
+		return false
+	}
+	// changedReaches reports whether a NodeAdded changed-peer for id reaches n1.
+	changedReaches := func(t *testing.T, id types.NodeID) bool {
+		t.Helper()
+
+		c := change.NodeAdded(id)
+		resp, err := m.buildFromChange(n1.ID, capVer, &c)
+		require.NoError(t, err)
+
+		if resp == nil {
+			return false
+		}
+
+		for _, p := range resp.PeersChanged {
+			if p.ID == id.NodeID() {
+				return true
+			}
+		}
+
+		return false
+	}
+	// profileReaches reports whether want's profile is delivered to n1 when n
+	// is added. Use a cross-user node so the result is not masked by n1's own
+	// always-present user profile.
+	profileReaches := func(t *testing.T, n *types.Node, want tailcfg.UserID) bool {
+		t.Helper()
+
+		c := change.NodeAdded(n.ID)
+		resp, err := m.buildFromChange(n1.ID, capVer, &c)
+		require.NoError(t, err)
+
+		if resp == nil {
+			return false
+		}
+
+		for _, up := range resp.UserProfiles {
+			if up.ID == want {
+				return true
+			}
+		}
+
+		return false
+	}
+
+	// wantFull pins the actual peer-visibility semantics so the invariant below
+	// cannot pass vacuously (e.g. if every path broke to zero identically).
+	// Note deny_all: an empty ACL set compiles to zero matchers, which headscale
+	// treats as "no visibility restriction" — all peers are visible on every
+	// path (the packet filter denies traffic separately). user_isolation and
+	// autogroup_self are the discriminating cases that prove filtering works.
+	tests := []struct {
+		name     string
+		policy   string
+		wantFull int
+	}{
+		{"allow_all", `{"acls":[{"action":"accept","src":["*"],"dst":["*:*"]}]}`, 2},
+		{
+			"user_isolation",
+			`{"acls":[
+				{"action":"accept","src":["u1@"],"dst":["u1@:*"]},
+				{"action":"accept","src":["u2@"],"dst":["u2@:*"]}
+			]}`,
+			1,
+		},
+		{"deny_all", `{"acls":[]}`, 2},
+		{
+			"autogroup_self",
+			`{"acls":[{"action":"accept","src":["autogroup:member"],"dst":["autogroup:self:*"]}]}`,
+			1,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := s.SetPolicy([]byte(tt.policy))
+			require.NoError(t, err)
+
+			full := fullVisible(t)
+			require.Lenf(t, full, tt.wantFull,
+				"%s: unexpected full-map visible peer count", tt.name)
+
+			for _, peer := range []*types.Node{n1b, n2} {
+				want := full[peer.ID.NodeID()]
+				assert.Equalf(t, want, patchReaches(t, peer.ID),
+					"%s: NodeOnline patch for %s must reach n1 iff full-map shows it",
+					tt.name, peer.Hostname)
+				assert.Equalf(t, want, changedReaches(t, peer.ID),
+					"%s: NodeAdded changed-peer for %s must reach n1 iff full-map shows it",
+					tt.name, peer.Hostname)
+			}
+			// Cross-user profile (user2) must appear iff n2 is visible to n1.
+			assert.Equalf(t, full[n2.ID.NodeID()], profileReaches(t, n2, user2.TailscaleUserProfile().ID),
+				"%s: user2 profile must be sent iff n2 is visible to n1", tt.name)
+		})
+	}
+}
+
+// TestFullMapResponseSurvivesPeerWithInvalidName proves a single node with an
+// FQDN-invalid GivenName must not break map generation for its peers.
+//
+// A node whose stored GivenName is empty (ErrNodeHasNoGivenName) or yields an
+// FQDN longer than MaxHostnameLength (ErrHostnameTooLong) makes GetFQDN, and
+// therefore TailNode, return an error. buildTailPeers used to abort the entire
+// peer list on the first such error, so MapResponseBuilder.Build() failed for
+// every node that could see the bad peer; on the initial-connection path that
+// surfaced as "PollNetMap: ... unexpected EOF" and the "Unable to connect to
+// the Tailscale coordination server" health warning. A legacy DB row loads
+// verbatim (NewNodeStore reads db.ListNodes() without re-sanitising names), so
+// the bad peer persists across restart. The build for an unaffected viewer
+// must succeed: the bad peer is dropped, valid peers and self survive.
+func TestFullMapResponseSurvivesPeerWithInvalidName(t *testing.T) {
+	for _, tt := range []struct {
+		name    string
+		badName string
+	}{
+		{"empty given name", ""},
+		{"over-long fqdn", strings.Repeat("a", types.MaxHostnameLength+1)},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			tmp := t.TempDir()
+			p4 := netip.MustParsePrefix("100.64.0.0/10")
+			p6 := netip.MustParsePrefix("fd7a:115c:a1e0::/48")
+			cfg := &types.Config{
+				Database: types.DatabaseConfig{
+					Type:   types.DatabaseSqlite,
+					Sqlite: types.SqliteConfig{Path: tmp + "/h.db"},
+				},
+				PrefixV4:     &p4,
+				PrefixV6:     &p6,
+				IPAllocation: types.IPAllocationStrategySequential,
+				BaseDomain:   "headscale.test",
+				Policy:       types.PolicyConfig{Mode: types.PolicyModeDB},
+				DERP: types.DERPConfig{
+					DERPMap: &tailcfg.DERPMap{
+						Regions: map[int]*tailcfg.DERPRegion{999: {RegionID: 999}},
+					},
+				},
+				Tuning: types.Tuning{
+					NodeStoreBatchSize:    state.TestBatchSize,
+					NodeStoreBatchTimeout: state.TestBatchTimeout,
+				},
+			}
+
+			database, err := db.NewHeadscaleDatabase(cfg)
+			require.NoError(t, err)
+
+			user := database.CreateUserForTest("u1")
+			n1 := database.CreateRegisteredNodeForTest(user, "n1")     // viewer, valid
+			bad := database.CreateRegisteredNodeForTest(user, "bad")   // peer, name corrupted below
+			good := database.CreateRegisteredNodeForTest(user, "good") // peer, valid control
+
+			// Simulate a legacy/corrupt row that v29 loads verbatim.
+			require.NoError(t, database.DB.
+				Model(&types.Node{}).
+				Where("id = ?", bad.ID).
+				Update("given_name", tt.badName).Error)
+			require.NoError(t, database.Close())
+
+			s, err := state.NewState(cfg)
+			require.NoError(t, err)
+			t.Cleanup(func() { _ = s.Close() })
+
+			// Allow-all so n1 sees both peers; the bad one must still be dropped.
+			_, err = s.SetPolicy([]byte(`{"acls":[{"action":"accept","src":["*"],"dst":["*:*"]}]}`))
+			require.NoError(t, err)
+
+			m := &mapper{state: s, cfg: cfg}
+			capVer := tailcfg.CurrentCapabilityVersion
+
+			resp, err := m.fullMapResponse(n1.ID, capVer)
+			require.NoError(t, err, "n1's map must build despite a peer with an invalid name")
+			require.NotNil(t, resp)
+			require.NotNil(t, resp.Node, "n1 must receive its own self node")
+
+			peers := map[tailcfg.NodeID]bool{}
+			for _, p := range resp.Peers {
+				peers[p.ID] = true
+			}
+
+			assert.False(t, peers[bad.ID.NodeID()], "the peer with an invalid name must be dropped")
+			assert.True(t, peers[good.ID.NodeID()], "valid peers must remain in the map")
+		})
+	}
+}
+
+// TestGenerateDNSConfigNilHostinfoNoPanic proves generateDNSConfig does not
+// panic when a node's Hostinfo is nil (e.g. a legacy DB row with a NULL
+// host_info column). addNextDNSMetadata dereferenced node.Hostinfo().OS()
+// without the .Valid() guard its siblings (RequestTags, TailNode) apply, so
+// building such a node's map crashed the server whenever a NextDNS resolver
+// was configured.
+func TestGenerateDNSConfigNilHostinfoNoPanic(t *testing.T) {
+	node := (&types.Node{
+		Hostname: "legacy-node",
+		IPv4:     iap("100.64.0.1"),
+		// Hostinfo intentionally nil, as a legacy NULL host_info row loads.
+	}).View()
+
+	cfg := &types.Config{
+		TailcfgDNSConfig: &tailcfg.DNSConfig{
+			Resolvers: []*dnstype.Resolver{{Addr: "https://dns.nextdns.io/abc"}},
+		},
+	}
+
+	require.NotPanics(t, func() {
+		generateDNSConfig(cfg, node, nil)
+	}, "generateDNSConfig must not panic when a node has nil Hostinfo")
+}
@@ -23,6 +23,16 @@ import (
 // after this error because the data was never delivered to any client.
 var errNoActiveConnections = errors.New("no active connections")

+// errNoReadyConnections is returned by [multiChannelNodeConn.send] when the
+// node's only connections are still waiting for their initial map
+// ([Batcher.AddNode] has registered them but not yet delivered the first full
+// response). Sending a delta now would make it the stream's first frame, which
+// Tailscale clients reject ("initial MapResponse lacked Node") — tearing down
+// the poll. Unlike [errNoActiveConnections], the change must be retried: the
+// in-flight initial map may have been generated from a snapshot older than
+// the change, so dropping it would lose the update.
+var errNoReadyConnections = errors.New("no connections ready for updates")
+
 // connectionEntry represents a single connection to a node.
 type connectionEntry struct {
 	id       string // unique connection ID
@@ -32,6 +42,13 @@ type connectionEntry struct {
 	stop     func()
 	lastUsed atomic.Int64 // Unix timestamp of last successful send
 	closed   atomic.Bool  // Indicates if this connection has been closed
+
+	// pendingInitial is set by [Batcher.AddNode] while this
+	// connection's initial map is still in flight, and cleared once it
+	// is delivered. Broadcast sends skip such connections so a delta
+	// can never become the stream's first frame ahead of the initial
+	// map. The zero value means the connection is ready.
+	pendingInitial atomic.Bool
 }

 // multiChannelNodeConn manages multiple concurrent connections for a single node.
@@ -56,6 +73,13 @@ type multiChannelNodeConn struct {
 	// Range in [multiChannelNodeConn.computePeerDiff]).
 	workMu sync.Mutex

+	// inFlight is true while a batched work bundle for this node is queued or
+	// being processed. processBatchedChanges refuses to queue a second bundle
+	// while one is in flight (the new changes wait in pending), so a saturated
+	// worker pool cannot deliver tick N+1 before tick N: a non-FIFO workMu
+	// cannot reorder bundles that never coexist.
+	inFlight atomic.Bool
+
 	closeOnce   sync.Once
 	updateCount atomic.Int64

@@ -218,6 +242,17 @@ func (mc *multiChannelNodeConn) appendPending(changes ...change.Change) {
 	mc.pendingMu.Unlock()
 }

+// prependPending puts changes at the head of the pending list, ahead of
+// anything queued since. Used to retry changes that could not be
+// delivered yet (initial map in flight): they were emitted before the
+// currently pending ones, and order matters for stateful patches like
+// online/offline.
+func (mc *multiChannelNodeConn) prependPending(changes ...change.Change) {
+	mc.pendingMu.Lock()
+	mc.pending = append(changes, mc.pending...)
+	mc.pendingMu.Unlock()
+}
+
 // drainPending atomically removes and returns all pending changes.
 // Returns nil if there are no pending changes.
 func (mc *multiChannelNodeConn) drainPending() []change.Change {
@@ -253,11 +288,27 @@ func (mc *multiChannelNodeConn) send(data *tailcfg.MapResponse) error {
 		return errNoActiveConnections
 	}

-	// Copy the slice so we can release the read lock before sending.
-	snapshot := make([]*connectionEntry, len(mc.connections))
-	copy(snapshot, mc.connections)
+	// Copy only connections whose initial map has been delivered.
+	// A connection still awaiting its initial map receives one
+	// (generated from the current snapshot) from [Batcher.AddNode];
+	// pushing this update at it now would deliver a delta as the
+	// stream's first frame.
+	snapshot := make([]*connectionEntry, 0, len(mc.connections))
+
+	for _, conn := range mc.connections {
+		if !conn.pendingInitial.Load() {
+			snapshot = append(snapshot, conn)
+		}
+	}
 	mc.mutex.RUnlock()

+	if len(snapshot) == 0 {
+		mc.log.Trace().
+			Msg("send: connections present but none ready, requeue")
+
+		return errNoReadyConnections
+	}
+
 	mc.log.Trace().
 		Int("total_connections", len(snapshot)).
 		Msg("send: broadcasting")
@@ -0,0 +1,59 @@
+package mapper
+
+import (
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"tailscale.com/tailcfg"
+)
+
+// TestAddNodeReconnectNotOrphanedByCleanup ensures a node reconnecting via
+// AddNode is not deleted from b.nodes by a concurrent cleanupOfflineNodes pass.
+// AddNode must register the connection atomically with the get-or-create, so
+// the offline-cleanup Compute either sees the active connection (and cancels)
+// or runs first and AddNode recreates the entry — never leaving a live
+// connection orphaned outside b.nodes.
+func TestAddNodeReconnectNotOrphanedByCleanup(t *testing.T) {
+	testData, cleanup := setupBatcherWithTestData(t, NewBatcherAndMapper, 1, 1, normalBufferSize)
+	defer cleanup()
+
+	b := testData.Batcher.Batcher
+	node := &testData.Nodes[0]
+
+	testData.State.Connect(node.n.ID)
+
+	go func() {
+		for range node.ch {
+		}
+	}()
+
+	require.NoError(t, b.AddNode(node.n.ID, node.ch, tailcfg.CapabilityVersion(100), nil))
+
+	// Model a long-offline conn awaiting cleanup or a rapid reconnect.
+	nc, ok := b.nodes.Load(node.n.ID)
+	require.True(t, ok)
+
+	nc.removeConnectionByChannel(node.ch)
+
+	past := time.Now().Add(-(offlineNodeCleanupThreshold + time.Minute))
+	nc.disconnectedAt.Store(&past)
+	require.False(t, nc.hasActiveConnections())
+
+	var wg sync.WaitGroup
+
+	wg.Go(func() {
+		_ = b.AddNode(node.n.ID, node.ch, tailcfg.CapabilityVersion(100), nil)
+	})
+
+	wg.Go(func() {
+		b.cleanupOfflineNodes()
+	})
+
+	wg.Wait()
+
+	assert.True(t, b.IsConnected(node.n.ID),
+		"reconnecting node was orphaned: live connection absent from b.nodes")
+}
@@ -84,7 +84,6 @@ type noiseServer struct {
 	http2Server    *http2.Server
 	conn           *controlbase.Conn
 	machineKey     key.MachinePublic
-	nodeKey        key.NodePublic

 	// [tailcfg.EarlyNoise]-related stuff
 	challenge       key.ChallengePrivate
@@ -611,6 +610,19 @@ func (ns *noiseServer) sshActionFollowUp(

 	auth, ok := ns.headscale.state.GetAuthCacheEntry(authID)
 	if !ok {
+		// The session is gone (expired, evicted, or lost on a control-plane
+		// restart). A bare error dead-ends the client: it keeps polling this
+		// now-defunct auth_id until the SSH connection times out. Re-delegate
+		// so a still-required check can complete instead.
+		if checkFound {
+			reqLog.Info().Caller().
+				Msg("SSH check auth session missing; re-delegating")
+
+			return ns.sshActionHoldAndDelegate(
+				reqLog, action, srcNodeID, dstNodeID,
+			)
+		}
+
 		return nil, NewHTTPError(
 			http.StatusBadRequest,
 			"Invalid auth_id",
@@ -716,8 +728,6 @@ func (ns *noiseServer) PollNetMapHandler(
 		return
 	}

-	ns.nodeKey = nv.NodeKey()
-
 	sess := ns.headscale.newMapSession(req.Context(), mapRequest, writer, nv.AsStruct())
 	sess.log.Trace().Caller().Msg("a node sending a MapRequest with Noise protocol")

@@ -753,8 +763,6 @@ func (ns *noiseServer) RegistrationHandler(
 			return &regReq, regErr(err)
 		}

-		ns.nodeKey = regReq.NodeKey
-
 		resp, err = ns.headscale.handleRegister(req.Context(), regReq, ns.conn.Peer())
 		if err != nil {
 			if httpErr, ok := errors.AsType[HTTPError](err); ok {
@@ -8,6 +8,7 @@ import (
 	"io"
 	"net/http"
 	"net/http/httptest"
+	"net/url"
 	"strconv"
 	"testing"

@@ -396,3 +397,143 @@ func TestOverrideRemoteAddr(t *testing.T) {

 	assert.Equal(t, clientAddr, observed)
 }
+
+// TestSSHActionHoldAndDelegate_PersistsAuthSession guards the happy path: the
+// initial SSH-check poll returns a HoldAndDelegate URL carrying an auth_id, and
+// that auth session must remain in the cache for the follow-up poll to find.
+func TestSSHActionHoldAndDelegate_PersistsAuthSession(t *testing.T) {
+	t.Parallel()
+
+	app := createTestApp(t)
+	user := app.state.CreateUserForTest("ssh-persist-user")
+	src := putTestNodeInStore(t, app, user, "src-node")
+	dst := putTestNodeInStore(t, app, user, "dst-node")
+
+	ns := &noiseServer{headscale: app, machineKey: dst.MachineKey}
+
+	rec := httptest.NewRecorder()
+	ns.SSHActionHandler(rec, newSSHActionRequest(t, src.ID, dst.ID))
+	require.Equal(t, http.StatusOK, rec.Code, "initial poll body=%s", rec.Body.String())
+
+	var action tailcfg.SSHAction
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &action))
+	require.NotEmpty(t, action.HoldAndDelegate, "expected HoldAndDelegate, got %+v", action)
+
+	u, err := url.Parse(action.HoldAndDelegate)
+	require.NoError(t, err)
+
+	authIDStr := u.Query().Get("auth_id")
+	require.NotEmpty(t, authIDStr, "HoldAndDelegate URL missing auth_id: %s", action.HoldAndDelegate)
+
+	authID, err := types.AuthIDFromString(authIDStr)
+	require.NoError(t, err)
+
+	_, ok := app.state.GetAuthCacheEntry(authID)
+	require.True(t, ok, "auth session %s must persist after HoldAndDelegate", authID)
+}
+
+// TestSSHActionHandler_RejectsMissingSessionWithoutCheck verifies that without
+// an SSH check covering the pair, a follow-up poll for an unknown auth_id is a
+// genuinely bogus request and is rejected. The re-delegation behaviour for a
+// missing session (issue #3305, exercised end to end with a real client in the
+// servertest package) applies only when the pair is still subject to a check.
+func TestSSHActionHandler_RejectsMissingSessionWithoutCheck(t *testing.T) {
+	t.Parallel()
+
+	app := createTestApp(t)
+	user := app.state.CreateUserForTest("ssh-nocheck-user")
+	src := putTestNodeInStore(t, app, user, "src-node")
+	dst := putTestNodeInStore(t, app, user, "dst-node")
+
+	// No SSH-check policy is set, so the pair is not subject to a check.
+	_, checkFound := app.state.SSHCheckParams(src.ID, dst.ID)
+	require.False(t, checkFound, "test setup: pair must not be subject to a check")
+
+	ns := &noiseServer{headscale: app, machineKey: dst.MachineKey}
+
+	missing := types.MustAuthID()
+
+	rec := httptest.NewRecorder()
+	ns.SSHActionHandler(rec, newSSHActionFollowUpRequest(t, src.ID, dst.ID, missing))
+	require.Equal(t, http.StatusBadRequest, rec.Code,
+		"a bogus auth_id with no active check must be rejected, body=%s", rec.Body.String())
+}
+
+// TestTS2021Route_AcceptsGETAndPOST reproduces a regression where the
+// browser/WASM control client could not connect. Tailscale's JS/WASM control
+// client opens /ts2021 as a WebSocket, which is an HTTP GET upgrade; the native
+// Go client uses an HTTP POST upgrade. The gorilla->chi router migration
+// registered /ts2021 for POST only, so the GET WebSocket handshake was rejected
+// with 405 Method Not Allowed by the router before it could reach
+// NoiseUpgradeHandler. Both methods must route to the handler.
+//
+// NoiseUpgradeHandler dispatches on the Upgrade header, not the HTTP method, so
+// once the route is reachable the handler handles both upgrade styles. The
+// httptest recorder is not an http.Hijacker, so the upgrade itself fails past
+// the router (501 for the WebSocket path, 400 for the native path) — the point
+// is only that neither is 405, i.e. the router no longer rejects GET early.
+func TestTS2021Route_AcceptsGETAndPOST(t *testing.T) {
+	t.Parallel()
+
+	handler := createTestApp(t).HTTPHandler()
+
+	tests := []struct {
+		name    string
+		method  string
+		headers map[string]string
+	}{
+		{
+			name:   "websocket_get_from_wasm_client",
+			method: http.MethodGet,
+			headers: map[string]string{
+				"Connection":             "Upgrade",
+				"Upgrade":                "websocket",
+				"Sec-WebSocket-Version":  "13",
+				"Sec-WebSocket-Key":      "dGhlIHNhbXBsZSBub25jZQ==",
+				"Sec-WebSocket-Protocol": "tailscale-control-protocol",
+			},
+		},
+		{
+			name:   "native_post_upgrade",
+			method: http.MethodPost,
+			headers: map[string]string{
+				"Connection":            "upgrade",
+				"Upgrade":               "tailscale-control-protocol",
+				"X-Tailscale-Handshake": "AAAA",
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			req := httptest.NewRequestWithContext(context.Background(), tt.method,
+				"/ts2021?X-Tailscale-Handshake=AAAA", nil)
+			for k, v := range tt.headers {
+				req.Header.Set(k, v)
+			}
+
+			rec := httptest.NewRecorder()
+			handler.ServeHTTP(rec, req)
+
+			assert.NotEqual(t, http.StatusMethodNotAllowed, rec.Code,
+				"%s /ts2021 must reach NoiseUpgradeHandler, not be rejected by the router with 405",
+				tt.method)
+		})
+	}
+}
+
+// newSSHActionFollowUpRequest is like newSSHActionRequest but carries the
+// auth_id query parameter that marks a follow-up poll.
+func newSSHActionFollowUpRequest(t *testing.T, src, dst types.NodeID, authID types.AuthID) *http.Request {
+	t.Helper()
+
+	req := newSSHActionRequest(t, src, dst)
+
+	q := req.URL.Query()
+	q.Set("auth_id", authID.String())
+	req.URL.RawQuery = q.Encode()
+
+	return req
+}
@@ -919,12 +919,14 @@ func renderAuthSuccessTemplate(
 	return bytes.NewBufferString(templates.AuthSuccess(result).Render())
 }

-// getCookieName generates a unique cookie name based on a cookie value.
-// Callers must ensure value has at least [cookieNamePrefixLen] bytes;
-// [extractCodeAndStateParamFromRequest] enforces this for the state
-// parameter, and [setCSRFCookie] always supplies a 64-byte random value.
+// getCookieName generates a unique cookie name based on a cookie value. It
+// uses at most [cookieNamePrefixLen] bytes of value, and fewer if value is
+// shorter, so a short value (e.g. a malformed nonce from a misbehaving IdP)
+// yields a non-matching name rather than panicking with slice-out-of-range.
 func getCookieName(baseName, value string) string {
-	return fmt.Sprintf("%s_%s", baseName, value[:cookieNamePrefixLen])
+	n := min(len(value), cookieNamePrefixLen)
+
+	return fmt.Sprintf("%s_%s", baseName, value[:n])
 }

 func setCSRFCookie(w http.ResponseWriter, r *http.Request, name string) (string, error) {
@@ -933,7 +935,7 @@ func setCSRFCookie(w http.ResponseWriter, r *http.Request, name string) (string,
 		return val, err
 	}

-	//nolint:gosec // G124: Secure set conditionally via r.TLS; HttpOnly + SameSite already set
+	//nolint:gosec // G124: Secure set conditionally via r.TLS; HttpOnly + SameSite set below
 	c := &http.Cookie{
 		Path:     "/oidc/callback",
 		Name:     getCookieName(name, val),
@@ -941,6 +943,12 @@ func setCSRFCookie(w http.ResponseWriter, r *http.Request, name string) (string,
 		MaxAge:   int(time.Hour.Seconds()),
 		Secure:   r.TLS != nil,
 		HttpOnly: true,
+		// Lax, not Strict: the OIDC callback is a cross-site top-level GET
+		// redirect from the IdP that must still carry this cookie. Strict
+		// would drop it and break login. Setting it explicitly also stops
+		// pre-Lax-default browsers from sending it on other cross-site
+		// requests.
+		SameSite: http.SameSiteLaxMode,
 	}
 	http.SetCookie(w, c)

@@ -0,0 +1,20 @@
+package hscontrol
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestGetCookieNameShortValue ensures a value shorter than the prefix length
+// (e.g. a malformed nonce from a misbehaving IdP) does not panic with
+// slice-out-of-range; it uses the available bytes instead.
+func TestGetCookieNameShortValue(t *testing.T) {
+	require.NotPanics(t, func() {
+		assert.Equal(t, "nonce_ab", getCookieName("nonce", "ab"))
+	})
+
+	assert.Equal(t, "nonce_abcdef", getCookieName("nonce", "abcdef"))
+	assert.Equal(t, "nonce_abcdef", getCookieName("nonce", "abcdefghij"))
+}
@@ -1,9 +1,13 @@
 package hscontrol

 import (
+	"net/http"
+	"net/http/httptest"
 	"testing"

 	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )

 func TestDoOIDCAuthorization(t *testing.T) {
@@ -171,3 +175,22 @@ func TestDoOIDCAuthorization(t *testing.T) {
 		})
 	}
 }
+
+// TestSetCSRFCookieSameSite verifies the OIDC state/nonce CSRF cookies carry an
+// explicit SameSite=Lax attribute. Lax (not Strict) is required because the
+// OIDC callback is a cross-site top-level GET navigation from the IdP that must
+// still carry the cookie — Strict would drop it and break login. The cookie
+// previously set no SameSite (despite a comment claiming it did), leaving
+// browsers that do not default to Lax sending it on cross-site requests.
+func TestSetCSRFCookieSameSite(t *testing.T) {
+	w := httptest.NewRecorder()
+	r := httptest.NewRequestWithContext(t.Context(), http.MethodGet, "/auth/abcdef0123456789", nil)
+
+	_, err := setCSRFCookie(w, r, "state")
+	require.NoError(t, err)
+
+	cookies := w.Result().Cookies()
+	require.Len(t, cookies, 1)
+	assert.Equal(t, http.SameSiteLaxMode, cookies[0].SameSite,
+		"OIDC CSRF cookie must explicitly set SameSite=Lax")
+}
@@ -7,8 +7,8 @@ import (
 	"net/http"
 	textTemplate "text/template"

+	"github.com/go-chi/chi/v5"
 	"github.com/gofrs/uuid/v5"
-	"github.com/gorilla/mux"
 	"github.com/juanfont/headscale/hscontrol/templates"
 )

@@ -36,10 +36,8 @@ func (h *Headscale) ApplePlatformConfig(
 	writer http.ResponseWriter,
 	req *http.Request,
 ) {
-	vars := mux.Vars(req)
-
-	platform, ok := vars["platform"]
-	if !ok {
+	platform := chi.URLParam(req, "platform")
+	if platform == "" {
 		httpError(writer, NewHTTPError(http.StatusBadRequest, "no platform specified", nil))
 		return
 	}
@@ -0,0 +1,110 @@
+package hscontrol
+
+import (
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestApplePlatformConfig_ServesProfilesViaChiRouter is the regression
+// guard for issue juanfont/headscale#3296.
+//
+// The Apple profile download endpoints (`/apple/macos-app-store`,
+// `/apple/macos-standalone`, `/apple/ios`) are registered on the chi
+// router (see hscontrol/app.go: `r.Get("/apple/{platform}", ...)`).
+// Before the fix, `ApplePlatformConfig` extracted the `{platform}` URL
+// parameter via `mux.Vars(req)` from gorilla/mux; because the request
+// never passed through a gorilla router, the lookup always missed and
+// every download returned HTTP 400 `no platform specified`.
+//
+// This test mounts the route on a chi router exactly as production
+// does so the assertion exercises the real router + handler wiring,
+// not a hand-crafted chi context. It fails if the handler ever again
+// reads URL parameters via an API the production router does not
+// populate.
+func TestApplePlatformConfig_ServesProfilesViaChiRouter(t *testing.T) {
+	t.Parallel()
+
+	h := &Headscale{
+		cfg: &types.Config{
+			ServerURL: "https://headscale.example.com",
+		},
+	}
+
+	// Mirror the production mount in hscontrol/app.go so this test
+	// covers the actual router + handler wiring, not a hand-crafted
+	// chi context.
+	r := chi.NewRouter()
+	r.Get("/apple/{platform}", h.ApplePlatformConfig)
+
+	srv := httptest.NewServer(r)
+	t.Cleanup(srv.Close)
+
+	platforms := []string{"macos-app-store", "macos-standalone", "ios"}
+	for _, platform := range platforms {
+		t.Run(platform, func(t *testing.T) {
+			t.Parallel()
+
+			//nolint:noctx // test fixture
+			resp, err := http.Get(srv.URL + "/apple/" + platform)
+			require.NoError(t, err)
+			t.Cleanup(func() { resp.Body.Close() })
+
+			bodyBytes, _ := io.ReadAll(resp.Body)
+			body := string(bodyBytes)
+
+			assert.Equal(t, http.StatusOK, resp.StatusCode,
+				"expected 200 for /apple/%s, got %d: %s",
+				platform, resp.StatusCode, body)
+			assert.Equal(t,
+				"application/x-apple-aspen-config; charset=utf-8",
+				resp.Header.Get("Content-Type"),
+				"profile must be served as an Apple aspen config")
+			assert.Contains(t, body,
+				"https://headscale.example.com",
+				"rendered profile must embed the configured ServerURL")
+		})
+	}
+}
+
+// TestApplePlatformConfig_RejectsUnknownPlatform locks the contract for
+// the `default:` branch of `ApplePlatformConfig`: an otherwise-valid
+// request whose `{platform}` segment is none of the three known values
+// must return HTTP 400 with the documented message. This catches both
+// silent fallthrough (e.g. a future template registered under a new
+// name without adding a case) and accidental message drift.
+func TestApplePlatformConfig_RejectsUnknownPlatform(t *testing.T) {
+	t.Parallel()
+
+	h := &Headscale{
+		cfg: &types.Config{
+			ServerURL: "https://headscale.example.com",
+		},
+	}
+
+	r := chi.NewRouter()
+	r.Get("/apple/{platform}", h.ApplePlatformConfig)
+
+	srv := httptest.NewServer(r)
+	t.Cleanup(srv.Close)
+
+	//nolint:noctx // test fixture
+	resp, err := http.Get(srv.URL + "/apple/windows-phone")
+	require.NoError(t, err)
+	t.Cleanup(func() { resp.Body.Close() })
+
+	bodyBytes, _ := io.ReadAll(resp.Body)
+	body := string(bodyBytes)
+
+	assert.Equal(t, http.StatusBadRequest, resp.StatusCode,
+		"unknown platform must be rejected with 400")
+	assert.Contains(t, body,
+		"platform must be ios, macos-app-store or macos-standalone",
+		"error body must list the supported platforms")
+}
@@ -49,7 +49,7 @@ func MatchesFromFilterRules(rules []tailcfg.FilterRule) []Match {
 // and [tailcfg.FilterRule.CapGrant][].Dsts: cap-grant-only rules (e.g.
 // tailscale.com/cap/relay) carry their destinations in CapGrant.Dsts and
 // would otherwise contribute nothing to peer-visibility derivation in
-// [policy.BuildPeerMap] / [policy.ReduceNodes], hiding the cap target
+// [policy.ReduceNodes], hiding the cap target
 // from the source unless a companion IP-level rule also exists.
 func MatchFromFilterRule(rule tailcfg.FilterRule) Match {
 	srcs := new(netipx.IPSetBuilder)
@@ -30,12 +30,26 @@ type PolicyManager interface {
 	// NodeCanHaveTag reports whether the given node can have the given tag.
 	NodeCanHaveTag(node types.NodeView, tag string) bool

+	// UserCanHaveTag reports whether the given user owns the given tag, i.e.
+	// is listed (directly or via a group) in the tag's tagOwners. This is the
+	// user half of NodeCanHaveTag, used to authorise re-auth tag changes
+	// against the authenticating user rather than the node's stale ownership.
+	UserCanHaveTag(user types.UserView, tag string) bool
+
 	// TagExists reports whether the given tag is defined in the policy.
 	TagExists(tag string) bool

 	// NodeCanApproveRoute reports whether the given node can approve the given route.
 	NodeCanApproveRoute(node types.NodeView, route netip.Prefix) bool

+	// NodeNeedsPeerRecompute reports whether peers must recompute their
+	// netmap when the node's online state changes. True for subnet
+	// routers, relay targets (tailscale.com/cap/relay), and via targets;
+	// false for ordinary nodes, which only need a lightweight online or
+	// offline peer patch. [State.Connect] and [State.Disconnect] use it to
+	// avoid a tailnet-wide recompute on every ordinary reconnect.
+	NodeNeedsPeerRecompute(node types.NodeView) bool
+
 	// ViaRoutesForPeer computes via grant effects for a viewer-peer pair.
 	// It returns which routes should be included (peer is via-designated for viewer)
 	// and excluded (steered to a different peer). When no via grants apply,
@@ -50,35 +50,6 @@ func ReduceRoutes(
 	return result
 }

-// BuildPeerMap builds a map of all peers that can be accessed by each node.
-//
-// Compared to [ReduceNodes], which builds the list per node, we end up with
-// doing the full work for every node (O(n^2)), while this will reduce the
-// list as we see relationships while building the map, making it O(n^2/2)
-// in the end, but with less work per node.
-func BuildPeerMap(
-	nodes views.Slice[types.NodeView],
-	matchers []matcher.Match,
-) map[types.NodeID][]types.NodeView {
-	ret := make(map[types.NodeID][]types.NodeView, nodes.Len())
-
-	// Build the map of all peers according to the matchers.
-	for i := range nodes.Len() {
-		for j := i + 1; j < nodes.Len(); j++ {
-			if nodes.At(i).ID() == nodes.At(j).ID() {
-				continue
-			}
-
-			if nodes.At(i).CanAccess(matchers, nodes.At(j)) || nodes.At(j).CanAccess(matchers, nodes.At(i)) {
-				ret[nodes.At(i).ID()] = append(ret[nodes.At(i).ID()], nodes.At(j))
-				ret[nodes.At(j).ID()] = append(ret[nodes.At(j).ID()], nodes.At(i))
-			}
-		}
-	}
-
-	return ret
-}
-
 // ApproveRoutesWithPolicy checks if the node can approve the announced routes
 // and returns the new list of approved routes. The [PolicyManager] is consulted
 // via [PolicyManager.NodeCanApproveRoute].
@@ -0,0 +1,50 @@
+package v2
+
+import (
+	"net/netip"
+	"testing"
+
+	"github.com/juanfont/headscale/hscontrol/policy/matcher"
+	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/stretchr/testify/assert"
+	"tailscale.com/tailcfg"
+)
+
+// TestCanAccessWithRoutesMatchesCanAccess guards the peer-map optimization:
+// CanAccessWithRoutes, fed the same route data CanAccess computes internally,
+// must produce identical results. BuildPeerMap relies on this to precompute
+// each node's routes once instead of per pair.
+func TestCanAccessWithRoutesMatchesCanAccess(t *testing.T) {
+	user := types.User{Name: "u"}
+
+	subnetRouter := node("subnet", "100.64.0.1", "fd7a:115c:a1e0::1", user)
+	subnetRouter.Hostinfo = &tailcfg.Hostinfo{RoutableIPs: []netip.Prefix{netip.MustParsePrefix("10.0.0.0/24")}}
+	subnetRouter.ApprovedRoutes = []netip.Prefix{netip.MustParsePrefix("10.0.0.0/24")}
+
+	exitNode := node("exit", "100.64.0.2", "fd7a:115c:a1e0::2", user)
+	exitNode.Hostinfo = &tailcfg.Hostinfo{RoutableIPs: []netip.Prefix{netip.MustParsePrefix("0.0.0.0/0")}}
+	exitNode.ApprovedRoutes = []netip.Prefix{netip.MustParsePrefix("0.0.0.0/0")}
+
+	plain := node("plain", "100.64.0.3", "fd7a:115c:a1e0::3", user)
+
+	matchers := matcher.MatchesFromFilterRules([]tailcfg.FilterRule{
+		{
+			SrcIPs:   []string{"*"},
+			DstPorts: []tailcfg.NetPortRange{{IP: "*", Ports: tailcfg.PortRangeAny}},
+		},
+	})
+
+	views := []types.NodeView{subnetRouter.View(), exitNode.View(), plain.View()}
+
+	for _, a := range views {
+		for _, b := range views {
+			if a.ID() == b.ID() {
+				continue
+			}
+
+			want := a.CanAccess(matchers, b)
+			got := a.CanAccessWithRoutes(matchers, b, a.SubnetRoutes(), b.SubnetRoutes(), b.IsExitNode())
+			assert.Equalf(t, want, got, "%s -> %s", a.Hostname(), b.Hostname())
+		}
+	}
+}
@@ -594,6 +594,58 @@ func hasPerNodeGrants(grants []compiledGrant) bool {
 	return false
 }

+// collectRelayTargetIPs returns the set of IPs that are destinations of a
+// tailscale.com/cap/relay grant. A node whose IP is in this set is a relay
+// target: when it goes offline, peers holding a PeerRelay allocation through
+// it must recompute their netmap to drop the now-dead allocation. The relay
+// cap is carried on each grant's [tailcfg.CapGrant] with Dsts set to the
+// resolved relay destinations (see [Policy.compileOtherDests]); the reversed
+// companion rule carries [tailcfg.PeerCapabilityRelayTarget] instead and is
+// intentionally skipped.
+func collectRelayTargetIPs(grants []compiledGrant) (*netipx.IPSet, error) {
+	var b netipx.IPSetBuilder
+
+	for i := range grants {
+		for _, rule := range grants[i].rules {
+			for _, cg := range rule.CapGrant {
+				if _, ok := cg.CapMap[tailcfg.PeerCapabilityRelay]; !ok {
+					continue
+				}
+
+				for _, dst := range cg.Dsts {
+					b.AddPrefix(dst)
+				}
+			}
+		}
+	}
+
+	return b.IPSet()
+}
+
+// collectViaTargetTags returns the set of tags used as via targets across all
+// grants. A node carrying any of these tags is a via target: peers steering
+// traffic through it must recompute when it goes offline. Returns nil when no
+// via grants exist.
+func collectViaTargetTags(grants []compiledGrant) map[Tag]struct{} {
+	var tags map[Tag]struct{}
+
+	for i := range grants {
+		if grants[i].via == nil {
+			continue
+		}
+
+		for _, t := range grants[i].via.viaTags {
+			if tags == nil {
+				tags = make(map[Tag]struct{})
+			}
+
+			tags[t] = struct{}{}
+		}
+	}
+
+	return tags
+}
+
 // globalFilterRules extracts global filter rules from [compiledGrant]s.
 // Via grants produce no global rules (they are per-node only); regular
 // grants contribute their full pre-compiled ruleset; self grants
@@ -0,0 +1,137 @@
+package v2
+
+import (
+	"net/netip"
+	"testing"
+
+	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/stretchr/testify/require"
+	"gorm.io/gorm"
+	"tailscale.com/tailcfg"
+)
+
+// TestNodeNeedsPeerRecompute pins which node roles force peers to recompute
+// their netmap when the node's online state changes. An ordinary node only
+// needs the lightweight online/offline peer patch; subnet routers, relay
+// targets, and via targets change what peers compute and therefore need a
+// full recompute. The predicate is keyed on the flipping node, so an ordinary
+// node in a tailnet that uses relay or via elsewhere must still be classified
+// as not needing a recompute.
+func TestNodeNeedsPeerRecompute(t *testing.T) {
+	users := types.Users{
+		{Model: gorm.Model{ID: 1}, Name: "user1", Email: "user1@headscale.net"},
+	}
+
+	const allowAll = `{"acls":[{"action":"accept","src":["*"],"dst":["*:*"]}]}`
+
+	relayPol := `{
+		"tagOwners": {"tag:relay": ["user1@"]},
+		"grants": [
+			{"src": ["*"], "dst": ["tag:relay"], "app": {"tailscale.com/cap/relay": [{}]}}
+		]
+	}`
+
+	viaPol := `{
+		"tagOwners": {"tag:via": ["user1@"]},
+		"grants": [
+			{"src": ["*"], "dst": ["10.0.0.0/24"], "ip": ["*"], "via": ["tag:via"]}
+		]
+	}`
+
+	taildrivePol := `{
+		"tagOwners": {"tag:drive": ["user1@"]},
+		"grants": [
+			{"src": ["*"], "dst": ["tag:drive"], "app": {"tailscale.com/cap/drive": [{}]}}
+		]
+	}`
+
+	ordinary := node("ordinary", "100.64.0.1", "fd7a:115c:a1e0::1", users[0])
+	ordinary.ID = 1
+
+	subnetRouter := node("subnet", "100.64.0.2", "fd7a:115c:a1e0::2", users[0])
+	subnetRouter.ID = 2
+	subnetRouter.Hostinfo = &tailcfg.Hostinfo{
+		RoutableIPs: []netip.Prefix{netip.MustParsePrefix("10.0.0.0/24")},
+	}
+	subnetRouter.ApprovedRoutes = []netip.Prefix{netip.MustParsePrefix("10.0.0.0/24")}
+
+	relayTarget := node("relay", "100.64.0.3", "fd7a:115c:a1e0::3", users[0])
+	relayTarget.ID = 3
+	relayTarget.Tags = []string{"tag:relay"}
+
+	viaTarget := node("via", "100.64.0.4", "fd7a:115c:a1e0::4", users[0])
+	viaTarget.ID = 4
+	viaTarget.Tags = []string{"tag:via"}
+
+	driveTarget := node("drive", "100.64.0.5", "fd7a:115c:a1e0::5", users[0])
+	driveTarget.ID = 5
+	driveTarget.Tags = []string{"tag:drive"}
+
+	tests := []struct {
+		name    string
+		pol     string
+		nodes   types.Nodes
+		subject *types.Node
+		want    bool
+	}{
+		{
+			name:    "ordinary node under allow-all does not need recompute",
+			pol:     allowAll,
+			nodes:   types.Nodes{ordinary},
+			subject: ordinary,
+			want:    false,
+		},
+		{
+			name:    "subnet router needs recompute",
+			pol:     allowAll,
+			nodes:   types.Nodes{subnetRouter},
+			subject: subnetRouter,
+			want:    true,
+		},
+		{
+			name:    "relay target needs recompute",
+			pol:     relayPol,
+			nodes:   types.Nodes{relayTarget, ordinary},
+			subject: relayTarget,
+			want:    true,
+		},
+		{
+			name:    "ordinary node in a relay-using tailnet does not need recompute",
+			pol:     relayPol,
+			nodes:   types.Nodes{relayTarget, ordinary},
+			subject: ordinary,
+			want:    false,
+		},
+		{
+			name:    "via target needs recompute",
+			pol:     viaPol,
+			nodes:   types.Nodes{viaTarget, ordinary},
+			subject: viaTarget,
+			want:    true,
+		},
+		{
+			name:    "ordinary node in a via-using tailnet does not need recompute",
+			pol:     viaPol,
+			nodes:   types.Nodes{viaTarget, ordinary},
+			subject: ordinary,
+			want:    false,
+		},
+		{
+			name:    "taildrive target does not need recompute",
+			pol:     taildrivePol,
+			nodes:   types.Nodes{driveTarget, ordinary},
+			subject: driveTarget,
+			want:    false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			pm, err := NewPolicyManager([]byte(tt.pol), users, tt.nodes.ViewSlice())
+			require.NoError(t, err)
+
+			got := pm.NodeNeedsPeerRecompute(tt.subject.View())
+			require.Equal(t, tt.want, got)
+		})
+	}
+}
@@ -15,6 +15,7 @@ import (
 	"github.com/juanfont/headscale/hscontrol/policy/matcher"
 	"github.com/juanfont/headscale/hscontrol/policy/policyutil"
 	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/puzpuzpuz/xsync/v4"
 	"github.com/rs/zerolog/log"
 	"go4.org/netipx"
 	"tailscale.com/net/tsaddr"
@@ -28,7 +29,10 @@ import (
 var ErrInvalidTagOwner = errors.New("tag owner is not an Alias")

 type PolicyManager struct {
-	mu    sync.Mutex
+	// RWMutex, not Mutex, so concurrent map generation does not serialise on
+	// reads. The per-node caches are xsync.Maps so a read can fill them without
+	// taking the write lock.
+	mu    sync.RWMutex
 	pol   *Policy
 	users []types.User
 	nodes views.Slice[types.NodeView]
@@ -45,8 +49,17 @@ type PolicyManager struct {
 	autoApproveMapHash deephash.Sum
 	autoApproveMap     map[netip.Prefix]*netipx.IPSet

+	// relayTargetIPs holds the IPs of nodes that are destinations of a
+	// tailscale.com/cap/relay grant; viaTargetTags holds the tags used as
+	// via targets. A node matching either, or that is a subnet router,
+	// forces peers to recompute their netmap when its online state changes
+	// (see [PolicyManager.NodeNeedsPeerRecompute]). Recomputed from the
+	// compiled grants on every policy/user/node change.
+	relayTargetIPs *netipx.IPSet
+	viaTargetTags  map[Tag]struct{}
+
 	// Lazy map of SSH policies
-	sshPolicyMap map[types.NodeID]*tailcfg.SSHPolicy
+	sshPolicyMap *xsync.Map[types.NodeID, *tailcfg.SSHPolicy]

 	// compiledGrants are the grants with sources pre-resolved.
 	// The single source of truth for filter compilation. Both
@@ -55,12 +68,12 @@ type PolicyManager struct {
 	userNodeIdx    userNodeIndex

 	// Lazy map of per-node filter rules (reduced, for packet filters)
-	filterRulesMap map[types.NodeID][]tailcfg.FilterRule
+	filterRulesMap *xsync.Map[types.NodeID, []tailcfg.FilterRule]

 	// Lazy map of per-node matchers derived from UNREDUCED filter
 	// rules. Only populated on the slow path when needsPerNodeFilter
 	// is true; the fast path returns pm.matchers directly.
-	matchersForNodeMap map[types.NodeID][]matcher.Match
+	matchersForNodeMap *xsync.Map[types.NodeID, []matcher.Match]

 	// needsPerNodeFilter is true when any compiled grant requires
 	// per-node work (autogroup:self or via grants).
@@ -188,9 +201,9 @@ func NewPolicyManager(b []byte, users []types.User, nodes views.Slice[types.Node
 		pol:                policy,
 		users:              users,
 		nodes:              nodes,
-		sshPolicyMap:       make(map[types.NodeID]*tailcfg.SSHPolicy, nodes.Len()),
-		filterRulesMap:     make(map[types.NodeID][]tailcfg.FilterRule, nodes.Len()),
-		matchersForNodeMap: make(map[types.NodeID][]matcher.Match, nodes.Len()),
+		sshPolicyMap:       xsync.NewMap[types.NodeID, *tailcfg.SSHPolicy](),
+		filterRulesMap:     xsync.NewMap[types.NodeID, []tailcfg.FilterRule](),
+		matchersForNodeMap: xsync.NewMap[types.NodeID, []matcher.Match](),
 	}

 	_, err = pm.updateLocked()
@@ -223,6 +236,14 @@ func (pm *PolicyManager) updateLocked() (bool, error) {
 	pm.compiledGrants = pm.pol.compileGrants(pm.users, pm.nodes)
 	pm.userNodeIdx = buildUserNodeIndex(pm.nodes)
 	pm.needsPerNodeFilter = hasPerNodeGrants(pm.compiledGrants)
+	pm.viaTargetTags = collectViaTargetTags(pm.compiledGrants)
+
+	relayTargetIPs, err := collectRelayTargetIPs(pm.compiledGrants)
+	if err != nil {
+		return false, fmt.Errorf("collecting relay target IPs: %w", err)
+	}
+
+	pm.relayTargetIPs = relayTargetIPs

 	var filter []tailcfg.FilterRule
 	if pm.pol == nil || (pm.pol.ACLs == nil && pm.pol.Grants == nil) {
@@ -337,9 +358,9 @@ func (pm *PolicyManager) updateLocked() (bool, error) {
 		// TODO(kradalby): This could potentially be optimized by only clearing the
 		// policies for nodes that have changed. Particularly if the only difference is
 		// that nodes has been added or removed.
-		clear(pm.sshPolicyMap)
-		clear(pm.filterRulesMap)
-		clear(pm.matchersForNodeMap)
+		pm.sshPolicyMap.Clear()
+		pm.filterRulesMap.Clear()
+		pm.matchersForNodeMap.Clear()
 	}

 	// If nothing changed, no need to update nodes
@@ -360,16 +381,55 @@ func (pm *PolicyManager) updateLocked() (bool, error) {
 	return true, nil
 }

+// NodeNeedsPeerRecompute reports whether peers must recompute their netmap
+// when node's online state changes. A plain node only needs the lightweight
+// online/offline peer patch; these roles change what peers compute when the
+// node goes up or down, so they require a full recompute:
+//   - subnet router: primary-route failover changes peers' AllowedIPs
+//   - relay target (tailscale.com/cap/relay): peers must drop a stale
+//     PeerRelay allocation
+//   - via target: peers steer traffic through this node
+//
+// The check is keyed on the node itself, so an ordinary node in a tailnet
+// that uses relay or via for other nodes is correctly classified as not
+// needing a recompute.
+func (pm *PolicyManager) NodeNeedsPeerRecompute(node types.NodeView) bool {
+	if !node.Valid() {
+		return false
+	}
+
+	// Subnet-router status is intrinsic to the node, so it needs no policy
+	// state and is checked without the lock.
+	if node.IsSubnetRouter() {
+		return true
+	}
+
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()
+
+	if pm.relayTargetIPs != nil && node.InIPSet(pm.relayTargetIPs) {
+		return true
+	}
+
+	for tag := range pm.viaTargetTags {
+		if node.HasTag(string(tag)) {
+			return true
+		}
+	}
+
+	return false
+}
+
 // SSHPolicy returns the [tailcfg.SSHPolicy] for node, compiling and
 // caching on first access. Rules use SessionDuration = 0 (no
 // auto-approval) and emit check URLs of the form
 // /machine/ssh/action/{src}/to/{dst}?local_user={local_user} per the
 // SaaS wire format. Cache is invalidated on policy reload.
 func (pm *PolicyManager) SSHPolicy(baseURL string, node types.NodeView) (*tailcfg.SSHPolicy, error) {
-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()

-	if sshPol, ok := pm.sshPolicyMap[node.ID()]; ok {
+	if sshPol, ok := pm.sshPolicyMap.Load(node.ID()); ok {
 		return sshPol, nil
 	}

@@ -378,7 +438,7 @@ func (pm *PolicyManager) SSHPolicy(baseURL string, node types.NodeView) (*tailcf
 		return nil, fmt.Errorf("compiling SSH policy: %w", err)
 	}

-	pm.sshPolicyMap[node.ID()] = sshPol
+	pm.sshPolicyMap.Store(node.ID(), sshPol)

 	return sshPol, nil
 }
@@ -394,8 +454,8 @@ func (pm *PolicyManager) SSHPolicy(baseURL string, node types.NodeView) (*tailcf
 func (pm *PolicyManager) SSHCheckParams(
 	srcNodeID, dstNodeID types.NodeID,
 ) (time.Duration, bool) {
-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()

 	if pm.pol == nil || len(pm.pol.SSHs) == 0 {
 		return 0, false
@@ -442,7 +502,14 @@ func (pm *PolicyManager) SSHCheckParams(
 		// Check if dst node matches any destination.
 		for _, dst := range rule.Destinations {
 			if ag, isAG := dst.(*AutoGroup); isAG && ag.Is(AutoGroupSelf) {
+				// User().Valid() guards the User().ID() dereference: the
+				// NodeStore can hold a non-tagged node with UserID set but
+				// the User association unhydrated (nil), and IsTagged()
+				// alone does not cover that. Mirrors filter.go's
+				// autogroup:self guard. Without it, a tailnet client on the
+				// Noise SSH-check path crashes the server (nil deref).
 				if !srcNode.IsTagged() && !dstNode.IsTagged() &&
+					srcNode.User().Valid() && dstNode.User().Valid() &&
 					srcNode.User().ID() == dstNode.User().ID() {
 					return checkPeriodFromRule(rule), true
 				}
@@ -521,8 +588,8 @@ func (pm *PolicyManager) Filter() ([]tailcfg.FilterRule, []matcher.Match) {
 		return nil, nil
 	}

-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()

 	return pm.filter, pm.matchers
 }
@@ -541,8 +608,20 @@ func (pm *PolicyManager) BuildPeerMap(nodes views.Slice[types.NodeView]) map[typ
 		return nil
 	}

-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()
+
+	// Precompute each node's subnet routes and exit-node status once; the
+	// O(n^2) pair scans below would otherwise recompute them for every pair.
+	type nodeRoutes struct {
+		subnet []netip.Prefix
+		isExit bool
+	}
+
+	routeInfo := make(map[types.NodeID]nodeRoutes, nodes.Len())
+	for _, n := range nodes.All() {
+		routeInfo[n.ID()] = nodeRoutes{subnet: n.SubnetRoutes(), isExit: n.IsExitNode()}
+	}

 	// If we have a global filter, use it for all nodes (normal case).
 	// Via grants require the per-node path because the global filter
@@ -557,7 +636,9 @@ func (pm *PolicyManager) BuildPeerMap(nodes views.Slice[types.NodeView]) map[typ
 					continue
 				}

-				if nodes.At(i).CanAccess(pm.matchers, nodes.At(j)) || nodes.At(j).CanAccess(pm.matchers, nodes.At(i)) {
+				ri, rj := routeInfo[nodes.At(i).ID()], routeInfo[nodes.At(j).ID()]
+				if nodes.At(i).CanAccessWithRoutes(pm.matchers, nodes.At(j), ri.subnet, rj.subnet, rj.isExit) ||
+					nodes.At(j).CanAccessWithRoutes(pm.matchers, nodes.At(i), rj.subnet, ri.subnet, ri.isExit) {
 					ret[nodes.At(i).ID()] = append(ret[nodes.At(i).ID()], nodes.At(j))
 					ret[nodes.At(j).ID()] = append(ret[nodes.At(j).ID()], nodes.At(i))
 				}
@@ -589,10 +670,12 @@ func (pm *PolicyManager) BuildPeerMap(nodes views.Slice[types.NodeView]) map[typ
 	for i := range nodes.Len() {
 		nodeI := nodes.At(i)
 		matchersI, hasFilterI := nodeMatchers[nodeI.ID()]
+		riI := routeInfo[nodeI.ID()]

 		for j := i + 1; j < nodes.Len(); j++ {
 			nodeJ := nodes.At(j)
 			matchersJ, hasFilterJ := nodeMatchers[nodeJ.ID()]
+			riJ := routeInfo[nodeJ.ID()]

 			// Check all access directions for symmetric peer visibility.
 			// For via grants, filter rules exist on the via-designated node
@@ -603,10 +686,10 @@ func (pm *PolicyManager) BuildPeerMap(nodes views.Slice[types.NodeView]) map[typ
 			//      using nodeI's matchers? (reverse direction: the matchers
 			//      on the via node accept traffic FROM the source)
 			// Same for matchersJ in both directions.
-			canIAccessJ := hasFilterI && nodeI.CanAccess(matchersI, nodeJ)
-			canJAccessI := hasFilterJ && nodeJ.CanAccess(matchersJ, nodeI)
-			canJReachI := hasFilterI && nodeJ.CanAccess(matchersI, nodeI)
-			canIReachJ := hasFilterJ && nodeI.CanAccess(matchersJ, nodeJ)
+			canIAccessJ := hasFilterI && nodeI.CanAccessWithRoutes(matchersI, nodeJ, riI.subnet, riJ.subnet, riJ.isExit)
+			canJAccessI := hasFilterJ && nodeJ.CanAccessWithRoutes(matchersJ, nodeI, riJ.subnet, riI.subnet, riI.isExit)
+			canJReachI := hasFilterI && nodeJ.CanAccessWithRoutes(matchersI, nodeI, riJ.subnet, riI.subnet, riI.isExit)
+			canIReachJ := hasFilterJ && nodeI.CanAccessWithRoutes(matchersJ, nodeJ, riI.subnet, riJ.subnet, riJ.isExit)

 			if canIAccessJ || canJAccessI || canJReachI || canIReachJ {
 				ret[nodeI.ID()] = append(ret[nodeI.ID()], nodeJ)
@@ -647,7 +730,7 @@ func (pm *PolicyManager) filterForNodeLocked(
 		return nil
 	}

-	if rules, ok := pm.filterRulesMap[node.ID()]; ok {
+	if rules, ok := pm.filterRulesMap.Load(node.ID()); ok {
 		return rules
 	}

@@ -659,7 +742,7 @@ func (pm *PolicyManager) filterForNodeLocked(
 	}

 	reduced := policyutil.ReduceFilterRules(node, unreduced)
-	pm.filterRulesMap[node.ID()] = reduced
+	pm.filterRulesMap.Store(node.ID(), reduced)

 	return reduced
 }
@@ -676,8 +759,8 @@ func (pm *PolicyManager) FilterForNode(node types.NodeView) ([]tailcfg.FilterRul
 		return nil, nil
 	}

-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()

 	return pm.filterForNodeLocked(node), nil
 }
@@ -697,8 +780,8 @@ func (pm *PolicyManager) MatchersForNode(node types.NodeView) ([]matcher.Match,
 		return nil, nil
 	}

-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()

 	// For global policies, return the shared global matchers.
 	// Via grants require per-node matchers because the global matchers
@@ -707,7 +790,7 @@ func (pm *PolicyManager) MatchersForNode(node types.NodeView) ([]matcher.Match,
 		return pm.matchers, nil
 	}

-	if cached, ok := pm.matchersForNodeMap[node.ID()]; ok {
+	if cached, ok := pm.matchersForNodeMap.Load(node.ID()); ok {
 		return cached, nil
 	}

@@ -715,7 +798,7 @@ func (pm *PolicyManager) MatchersForNode(node types.NodeView) ([]matcher.Match,
 	// the stored compiled grants for this specific node.
 	unreduced := pm.filterRulesForNodeLocked(node)
 	matchers := matcher.MatchesFromFilterRules(unreduced)
-	pm.matchersForNodeMap[node.ID()] = matchers
+	pm.matchersForNodeMap.Store(node.ID(), matchers)

 	return matchers, nil
 }
@@ -734,7 +817,7 @@ func (pm *PolicyManager) SetUsers(users []types.User) (bool, error) {
 	// Clear SSH policy map when users change to force SSH policy recomputation
 	// This ensures that if SSH policy compilation previously failed due to missing users,
 	// it will be retried with the new user list
-	clear(pm.sshPolicyMap)
+	pm.sshPolicyMap.Clear()

 	changed, err := pm.updateLocked()
 	if err != nil {
@@ -787,9 +870,9 @@ func (pm *PolicyManager) SetNodes(nodes views.Slice[types.NodeView]) (bool, erro

 		if !needsUpdate {
 			// This ensures fresh filter rules are generated for all nodes
-			clear(pm.sshPolicyMap)
-			clear(pm.filterRulesMap)
-			clear(pm.matchersForNodeMap)
+			pm.sshPolicyMap.Clear()
+			pm.filterRulesMap.Clear()
+			pm.matchersForNodeMap.Clear()
 		}
 		// Always return true when nodes changed, even if filter hash didn't change
 		// (can happen with autogroup:self or when nodes are added but don't affect rules)
@@ -838,12 +921,18 @@ func (pm *PolicyManager) nodesHavePolicyAffectingChanges(newNodes views.Slice[ty
 // set any existing tag on any node by calling [state.State.SetNodeTags] directly,
 // which bypasses this authorization check.
 func (pm *PolicyManager) NodeCanHaveTag(node types.NodeView, tag string) bool {
-	if pm == nil || pm.pol == nil {
+	if pm == nil {
 		return false
 	}

-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()
+
+	// pm.pol is written by SetPolicy under pm.mu; reading it before the
+	// lock races with concurrent policy reloads.
+	if pm.pol == nil {
+		return false
+	}

 	// Check if tag exists in policy
 	owners, exists := pm.pol.TagOwners[Tag(tag)]
@@ -875,6 +964,37 @@ func (pm *PolicyManager) NodeCanHaveTag(node types.NodeView, tag string) bool {
 	return false
 }

+// UserCanHaveTag reports whether the given user is one of the tag's owners
+// (directly or via a group). It is the user half of [PolicyManager.NodeCanHaveTag]:
+// re-authentication authorises requested tags against the authenticating user,
+// because a tag-owned node carries no user and its IP is not in any owner set,
+// so only the user presenting the credential can prove ownership.
+func (pm *PolicyManager) UserCanHaveTag(user types.UserView, tag string) bool {
+	if pm == nil || !user.Valid() {
+		return false
+	}
+
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()
+
+	if pm.pol == nil {
+		return false
+	}
+
+	owners, exists := pm.pol.TagOwners[Tag(tag)]
+	if !exists {
+		return false
+	}
+
+	for _, owner := range owners {
+		if pm.userMatchesOwner(user, owner) {
+			return true
+		}
+	}
+
+	return false
+}
+
 // userMatchesOwner checks if a user matches a tag owner entry.
 // This is used as a fallback when the node's IP is not in the [PolicyManager.tagOwnerMap].
 func (pm *PolicyManager) userMatchesOwner(user types.UserView, owner Owner) bool {
@@ -921,12 +1041,18 @@ func (pm *PolicyManager) userMatchesOwner(user types.UserView, owner Owner) bool

 // TagExists reports whether the given tag is defined in the policy.
 func (pm *PolicyManager) TagExists(tag string) bool {
-	if pm == nil || pm.pol == nil {
+	if pm == nil {
 		return false
 	}

-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()
+
+	// pm.pol is written by SetPolicy under pm.mu; reading it before the
+	// lock races with concurrent policy reloads.
+	if pm.pol == nil {
+		return false
+	}

 	_, exists := pm.pol.TagOwners[Tag(tag)]

@@ -938,8 +1064,8 @@ func (pm *PolicyManager) NodeCanApproveRoute(node types.NodeView, route netip.Pr
 		return false
 	}

-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()

 	// If the route to-be-approved is an exit route, then we need to check
 	// if the node is in allowed to approve it. This is treated differently
@@ -997,12 +1123,18 @@ func (pm *PolicyManager) NodeCanApproveRoute(node types.NodeView, route netip.Pr
 func (pm *PolicyManager) ViaRoutesForPeer(viewer, peer types.NodeView) types.ViaRouteResult {
 	var result types.ViaRouteResult

-	if pm == nil || pm.pol == nil {
+	if pm == nil {
 		return result
 	}

-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()
+
+	// pm.pol is written by SetPolicy under pm.mu; reading it before the
+	// lock races with concurrent policy reloads.
+	if pm.pol == nil {
+		return result
+	}

 	// Self-steering doesn't apply.
 	if viewer.ID() == peer.ID() {
@@ -1212,6 +1344,11 @@ func (pm *PolicyManager) DebugString() string {
 		return "PolicyManager is not setup"
 	}

+	// pm.pol, filter, matchers, and the derived maps are all written
+	// under pm.mu by SetPolicy/SetUsers/SetNodes.
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()
+
 	var sb strings.Builder

 	fmt.Fprintf(&sb, "PolicyManager (v%d):\n\n", pm.Version())
@@ -1373,7 +1510,7 @@ func (pm *PolicyManager) invalidateAutogroupSelfCache(oldNodes, newNodes views.S
 	// Clear cache entries for affected users only.
 	// For autogroup:self, we need to clear all nodes belonging to affected users
 	// because autogroup:self rules depend on the entire user's device set.
-	for nodeID := range pm.filterRulesMap {
+	pm.filterRulesMap.Range(func(nodeID types.NodeID, _ []tailcfg.FilterRule) bool {
 		// Find the user for this cached node
 		var nodeUserID types.UserID

@@ -1416,20 +1553,22 @@ func (pm *PolicyManager) invalidateAutogroupSelfCache(oldNodes, newNodes views.S
 		// If we found the user and they're affected, clear this cache entry
 		if found {
 			if _, affected := affectedUsers[nodeUserID]; affected {
-				delete(pm.filterRulesMap, nodeID)
-				delete(pm.matchersForNodeMap, nodeID)
+				pm.filterRulesMap.Delete(nodeID)
+				pm.matchersForNodeMap.Delete(nodeID)
 			}
 		} else {
 			// Node not found in either old or new list, clear it
-			delete(pm.filterRulesMap, nodeID)
-			delete(pm.matchersForNodeMap, nodeID)
+			pm.filterRulesMap.Delete(nodeID)
+			pm.matchersForNodeMap.Delete(nodeID)
 		}
-	}
+
+		return true
+	})

 	if len(affectedUsers) > 0 {
 		log.Debug().
 			Int("affected_users", len(affectedUsers)).
-			Int("remaining_cache_entries", len(pm.filterRulesMap)).
+			Int("remaining_cache_entries", pm.filterRulesMap.Size()).
 			Msg("Selectively cleared autogroup:self cache for affected users")
 	}
 }
@@ -1470,23 +1609,27 @@ func (pm *PolicyManager) invalidateGlobalPolicyCache(newNodes views.Slice[types.
 		}

 		if newNode.HasNetworkChanges(oldNode) {
-			delete(pm.filterRulesMap, nodeID)
-			delete(pm.matchersForNodeMap, nodeID)
+			pm.filterRulesMap.Delete(nodeID)
+			pm.matchersForNodeMap.Delete(nodeID)
 		}
 	}

 	// Remove deleted nodes from cache
-	for nodeID := range pm.filterRulesMap {
+	pm.filterRulesMap.Range(func(nodeID types.NodeID, _ []tailcfg.FilterRule) bool {
 		if _, exists := newNodeMap[nodeID]; !exists {
-			delete(pm.filterRulesMap, nodeID)
+			pm.filterRulesMap.Delete(nodeID)
 		}
-	}

-	for nodeID := range pm.matchersForNodeMap {
+		return true
+	})
+
+	pm.matchersForNodeMap.Range(func(nodeID types.NodeID, _ []matcher.Match) bool {
 		if _, exists := newNodeMap[nodeID]; !exists {
-			delete(pm.matchersForNodeMap, nodeID)
+			pm.matchersForNodeMap.Delete(nodeID)
 		}
-	}
+
+		return true
+	})
 }

 // flattenTags resolves nested tag-owner references. Cycles
@@ -1668,8 +1811,8 @@ func (pm *PolicyManager) NodeCapMap(id types.NodeID) tailcfg.NodeCapMap {
 		return nil
 	}

-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()

 	src := pm.nodeAttrsMap[id]
 	if len(src) == 0 {
@@ -1692,8 +1835,8 @@ func (pm *PolicyManager) NodeCapMaps() map[types.NodeID]tailcfg.NodeCapMap {
 		return nil
 	}

-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()

 	out := make(map[types.NodeID]tailcfg.NodeCapMap, len(pm.nodeAttrsMap))
 	maps.Copy(out, pm.nodeAttrsMap)
@@ -0,0 +1,103 @@
+package v2
+
+import (
+	"fmt"
+	"sync"
+	"testing"
+
+	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"gorm.io/gorm"
+)
+
+// TestPolicyManagerConcurrentReads is the correctness guard for the #3346 fix:
+// PolicyManager read methods take a shared RLock and populate their per-node
+// caches (filterRulesMap, matchersForNodeMap) concurrently. This test hammers
+// those reads from many goroutines while a writer mutates the node set, so the
+// race detector catches any unsafe access to the shared caches or policy state.
+//
+// It uses an autogroup:self policy so reads take the per-node filter slow path
+// — the same path that made #3346's reconnect storm expensive — which is where
+// the lazy caches are written.
+func TestPolicyManagerConcurrentReads(t *testing.T) {
+	users := types.Users{
+		{Model: gorm.Model{ID: 1}, Name: "user1", Email: "user1@headscale.net"},
+		{Model: gorm.Model{ID: 2}, Name: "user2", Email: "user2@headscale.net"},
+		{Model: gorm.Model{ID: 3}, Name: "user3", Email: "user3@headscale.net"},
+	}
+
+	policy := `{
+		"acls": [
+			{
+				"action": "accept",
+				"src": ["autogroup:member"],
+				"dst": ["autogroup:self:*"]
+			}
+		]
+	}`
+
+	const nodeCount = 60
+
+	nodes := make(types.Nodes, 0, nodeCount)
+	for i := range nodeCount {
+		n := node(
+			fmt.Sprintf("node%d", i),
+			fmt.Sprintf("100.64.0.%d", i+1),
+			fmt.Sprintf("fd7a:115c:a1e0::%d", i+1),
+			users[i%len(users)],
+		)
+		n.ID = types.NodeID(i + 1) //nolint:gosec // safe in test
+		nodes = append(nodes, n)
+	}
+
+	pm, err := NewPolicyManager([]byte(policy), users, nodes.ViewSlice())
+	require.NoError(t, err)
+
+	const (
+		readers        = 16
+		iterations     = 60
+		mutatorReloads = 30
+	)
+
+	var wg sync.WaitGroup
+
+	// Concurrent readers exercise every converted RLock read path, including
+	// the two lazily populated per-node caches. Assertions inside the
+	// goroutines use assert (not require) so a failure does not call
+	// t.FailNow from a non-test goroutine.
+	for r := range readers {
+		wg.Go(func() {
+			for i := range iterations {
+				nv := nodes[(r+i)%len(nodes)].View()
+
+				rules, err := pm.FilterForNode(nv)
+				assert.NoError(t, err) //nolint:testifylint // assert (not require) is correct off the test goroutine
+				assert.NotNil(t, rules)
+
+				_, err = pm.MatchersForNode(nv)
+				assert.NoError(t, err) //nolint:testifylint // assert (not require) is correct off the test goroutine
+
+				pm.Filter()
+				pm.NodeCapMap(nv.ID())
+
+				// BuildPeerMap is the O(n^2) writer-side read; exercise it
+				// under RLock too, but not every iteration.
+				if i%8 == 0 {
+					assert.NotNil(t, pm.BuildPeerMap(nodes.ViewSlice()))
+				}
+			}
+		})
+	}
+
+	// A writer repeatedly re-sets the node set, invalidating and racing the
+	// caches the readers are populating.
+	wg.Go(func() {
+		for range mutatorReloads {
+			_, err := pm.SetNodes(nodes.ViewSlice())
+			assert.NoError(t, err) //nolint:testifylint // assert (not require) is correct off the test goroutine
+		}
+	})
+
+	wg.Wait()
+}
@@ -8,6 +8,7 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"github.com/juanfont/headscale/hscontrol/policy/matcher"
 	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/puzpuzpuz/xsync/v4"
 	"github.com/stretchr/testify/require"
 	"gorm.io/gorm"
 	"tailscale.com/net/tsaddr"
@@ -122,7 +123,7 @@ func TestInvalidateAutogroupSelfCache(t *testing.T) {
 		require.NoError(t, err)
 	}

-	require.Len(t, pm.filterRulesMap, len(initialNodes))
+	require.Equal(t, len(initialNodes), pm.filterRulesMap.Size())

 	tests := []struct {
 		name            string
@@ -207,19 +208,20 @@ func TestInvalidateAutogroupSelfCache(t *testing.T) {
 				}
 			}

-			pm.filterRulesMap = make(map[types.NodeID][]tailcfg.FilterRule)
+			pm.filterRulesMap.Clear()
+
 			for _, n := range initialNodes {
 				_, err := pm.FilterForNode(n.View())
 				require.NoError(t, err)
 			}

-			initialCacheSize := len(pm.filterRulesMap)
+			initialCacheSize := pm.filterRulesMap.Size()
 			require.Equal(t, len(initialNodes), initialCacheSize)

 			pm.invalidateAutogroupSelfCache(initialNodes.ViewSlice(), tt.newNodes.ViewSlice())

 			// Verify the expected number of cache entries were cleared
-			finalCacheSize := len(pm.filterRulesMap)
+			finalCacheSize := pm.filterRulesMap.Size()
 			clearedEntries := initialCacheSize - finalCacheSize
 			require.Equal(t, tt.expectedCleared, clearedEntries, tt.description)
 		})
@@ -292,6 +294,68 @@ func TestSetNodesAutogroupSelfUnhydratedUser(t *testing.T) {
 	require.NoError(t, err)
 }

+// TestSSHCheckParamsUnhydratedUserNoPanic proves that SSHCheckParams does
+// not panic when a non-tagged node reaches the policy manager with its
+// UserID set but its User association unhydrated (User pointer nil) — the
+// same NodeStore shape that crashed /machine/map in commit 171fd7a3. The
+// autogroup:self SSH branch dereferences node.User().ID() guarded only by
+// !IsTagged(), not by User().Valid(); SSHCheckParams is reached from the
+// Noise SSH-check path (noise.go), so a tailnet client triggers the panic
+// and crashes the server (DoS) whenever an SSH check rule with an
+// autogroup:self destination is active.
+func TestSSHCheckParamsUnhydratedUserNoPanic(t *testing.T) {
+	users := types.Users{
+		{Model: gorm.Model{ID: 1}, Name: "user1", Email: "user1@headscale.net"},
+	}
+
+	policy := `{
+		"ssh": [
+			{
+				"action": "check",
+				"src":    ["user1@headscale.net"],
+				"dst":    ["autogroup:self"],
+				"users":  ["root"]
+			}
+		]
+	}`
+
+	initialNodes := types.Nodes{
+		node("user1-src", "100.64.0.1", "fd7a:115c:a1e0::1", users[0]),
+		node("user1-dst", "100.64.0.2", "fd7a:115c:a1e0::2", users[0]),
+	}
+	for i, n := range initialNodes {
+		n.ID = types.NodeID(i + 1) //nolint:gosec // safe conversion in test
+	}
+
+	pm, err := NewPolicyManager([]byte(policy), users, initialNodes.ViewSlice())
+	require.NoError(t, err)
+
+	// Simulate a node restarting tailscaled: the destination node is pushed
+	// back into the policy manager with no hydrated User association (UserID
+	// set, User pointer nil), the exact shape that crashed beta.1.
+	unhydratedDst := &types.Node{
+		ID:       2,
+		Hostname: "user1-dst",
+		IPv4:     ap("100.64.0.2"),
+		IPv6:     ap("fd7a:115c:a1e0::2"),
+		UserID:   new(users[0].ID),
+		User:     nil,
+	}
+	require.False(t, unhydratedDst.IsTagged(), "dst node must be user-owned for autogroup:self")
+
+	updatedNodes := types.Nodes{
+		node("user1-src", "100.64.0.1", "fd7a:115c:a1e0::1", users[0]),
+		unhydratedDst,
+	}
+	updatedNodes[0].ID = 1
+	_, err = pm.SetNodes(updatedNodes.ViewSlice())
+	require.NoError(t, err)
+
+	require.NotPanics(t, func() {
+		pm.SSHCheckParams(types.NodeID(1), types.NodeID(2))
+	}, "SSHCheckParams must not panic when a non-tagged node has an unhydrated User")
+}
+
 // TestInvalidateGlobalPolicyCache tests the cache invalidation logic for global policies.
 func TestInvalidateGlobalPolicyCache(t *testing.T) {
 	mustIPPtr := func(s string) *netip.Addr {
@@ -436,15 +500,19 @@ func TestInvalidateGlobalPolicyCache(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			pm := &PolicyManager{
-				nodes:          tt.oldNodes.ViewSlice(),
-				filterRulesMap: tt.initialCache,
+				nodes:              tt.oldNodes.ViewSlice(),
+				filterRulesMap:     xsync.NewMap[types.NodeID, []tailcfg.FilterRule](),
+				matchersForNodeMap: xsync.NewMap[types.NodeID, []matcher.Match](),
+			}
+			for id, rules := range tt.initialCache {
+				pm.filterRulesMap.Store(id, rules)
 			}

 			pm.invalidateGlobalPolicyCache(tt.newNodes.ViewSlice())

 			// Verify cache state
 			for nodeID, shouldExist := range tt.expectedCacheAfter {
-				_, exists := pm.filterRulesMap[nodeID]
+				_, exists := pm.filterRulesMap.Load(nodeID)
 				require.Equal(t, shouldExist, exists, "node %d cache existence mismatch", nodeID)
 			}
 		})
@@ -128,8 +128,8 @@ func (pm *PolicyManager) RunSSHTests() error {
 		return nil
 	}

-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()

 	cache := make(map[types.NodeID]*tailcfg.SSHPolicy)
 	results := runSSHPolicyTests(pm.pol, pm.users, pm.nodes, cache)
@@ -204,8 +204,8 @@ func (pm *PolicyManager) RunTests() error {
 		return nil
 	}

-	pm.mu.Lock()
-	defer pm.mu.Unlock()
+	pm.mu.RLock()
+	defer pm.mu.RUnlock()

 	results := runPolicyTests(pm.pol, pm.filter, pm.users, pm.nodes)
 	if results.AllPassed {
@@ -96,12 +96,6 @@ func (m *mapSession) stopFromBatcher() {
 	}
 }

-func (m *mapSession) beforeServeLongPoll() {
-	if m.node.IsEphemeral() {
-		m.h.ephemeralGC.Cancel(m.node.ID)
-	}
-}
-
 // afterServeLongPoll is called when a long-polling session ends and the node
 // is disconnected.
 func (m *mapSession) afterServeLongPoll() {
@@ -144,14 +138,12 @@ func (m *mapSession) serve() {
 //
 //nolint:gocyclo
 func (m *mapSession) serveLongPoll() {
-	m.beforeServeLongPoll()
-
 	m.log.Trace().Caller().Msg("long poll session started")

 	// connectGen is set by [state.State.Connect] below and captured by the deferred cleanup closure.
-	// It allows [state.State.Disconnect] to reject stale calls from old sessions — if a newer session
-	// has called [state.State.Connect] (incrementing the generation), the old session's [state.State.Disconnect]
-	// sees a mismatched generation and becomes a no-op.
+	// Each Connect acquires one live session in state; the cleanup must release
+	// it with exactly one [state.State.Disconnect] call, in every exit path, or
+	// the node's session count leaks and it stays online forever.
 	var connectGen uint64

 	// Clean up the session when the client disconnects
@@ -160,49 +152,55 @@ func (m *mapSession) serveLongPoll() {

 		stillConnected := m.h.mapBatcher.RemoveNode(m.node.ID, m.ch)

-		// If another session already exists for this node (reconnect
-		// happened before this cleanup ran), skip the grace period
-		// entirely — the node is not actually disconnecting.
-		if stillConnected {
+		// This session never reached [state.State.Connect]; there is no
+		// session to release.
+		if connectGen == 0 {
 			return
 		}

 		// When a node disconnects, it might rapidly reconnect (e.g. mobile clients, network weather).
 		// Instead of immediately marking the node as offline, we wait a few seconds to see if it reconnects.
-		// If it does reconnect, the existing [mapSession] will be replaced and the node remains online.
-		// If it doesn't reconnect within the timeout, we mark it as offline.
+		// If it reconnects during the wait, the new session's Connect raises the
+		// session count, so the release below keeps the node online.
 		//
 		// This avoids flapping nodes in the UI and unnecessary churn in the network.
 		// This is not my favourite solution, but it kind of works in our eventually consistent world.
-		ticker := time.NewTicker(time.Second)
-		defer ticker.Stop()
+		//
+		// When another session already replaced this one (stillConnected), skip
+		// the wait — but never the release itself. A cancelled map request whose
+		// handler ran late is exactly such a session: if it kept its session
+		// acquired on this path, the surviving session's release could never
+		// take the node offline (the relogin flake).
+		if !stillConnected {
+			// Wait up to 10 seconds for the node to reconnect.
+			// 10 seconds was arbitrary chosen as a reasonable time to reconnect.
+			ticker := time.NewTicker(time.Second)
+			defer ticker.Stop()

-		disconnected := true
-		// Wait up to 10 seconds for the node to reconnect.
-		// 10 seconds was arbitrary chosen as a reasonable time to reconnect.
-		for range 10 {
-			if m.h.mapBatcher.IsConnected(m.node.ID) {
-				disconnected = false
-				break
+			for range 10 {
+				if m.h.mapBatcher.IsConnected(m.node.ID) {
+					break
+				}
+
+				<-ticker.C
 			}
-
-			<-ticker.C
 		}

-		if disconnected {
-			// Pass the generation from our [state.State.Connect] call. If a newer session has
-			// connected since (bumping the generation), [state.State.Disconnect] will detect
-			// the mismatch and skip the state update, preventing the race where
-			// an old grace period goroutine overwrites a newer session's online status.
-			disconnectChanges, err := m.h.state.Disconnect(m.node.ID, connectGen)
-			if err != nil {
-				m.log.Error().Caller().Err(err).Msg("failed to disconnect node")
-			}
-
-			m.h.Change(disconnectChanges...)
-			m.afterServeLongPoll()
-			m.log.Info().Caller().Str(zf.Chan, fmt.Sprintf("%p", m.ch)).Msg("node has disconnected")
+		// Release this session. The node goes offline exactly when the last
+		// live session is released, so releases from replaced or stale
+		// sessions are harmless regardless of the order they run in.
+		disconnectChanges, err := m.h.state.Disconnect(m.node.ID, connectGen)
+		if err != nil {
+			m.log.Error().Caller().Err(err).Msg("failed to disconnect node")
 		}
+
+		if len(disconnectChanges) == 0 {
+			return
+		}
+
+		m.h.Change(disconnectChanges...)
+		m.afterServeLongPoll()
+		m.log.Info().Caller().Str(zf.Chan, fmt.Sprintf("%p", m.ch)).Msg("node has disconnected")
 	}()

 	// Set up the client stream
@@ -224,6 +222,11 @@ func (m *mapSession) serveLongPoll() {
 	mapReqChange, err := m.h.state.UpdateNodeFromMapRequest(m.node.ID, m.req)
 	if err != nil {
 		m.log.Error().Caller().Err(err).Msg("failed to update node from initial MapRequest")
+		// Write an explicit error rather than returning silently: a bare
+		// return leaves net/http to send an empty 200, which the client
+		// reads as "unexpected EOF" and retries forever (issue #3346).
+		httpError(m.w, err)
+
 		return
 	}

@@ -237,6 +240,13 @@ func (m *mapSession) serveLongPoll() {

 	connectChanges, connectGen = m.h.state.Connect(m.node.ID)

+	// Cancel ephemeral GC only after Connect succeeds. Cancelling at the start
+	// of serveLongPoll left departed nodes without a deletion timer when a
+	// reconnect attempt failed before Connect (issue #3382).
+	if m.node.IsEphemeral() {
+		m.h.ephemeralGC.Cancel(m.node.ID)
+	}
+
 	m.log.Info().Caller().Str(zf.Chan, fmt.Sprintf("%p", m.ch)).Msg("node has connected")

 	// TODO(kradalby): Redo the comments here
@@ -246,6 +256,11 @@ func (m *mapSession) serveLongPoll() {
 	// time between the node connecting and the batcher being ready.
 	if err := m.h.mapBatcher.AddNode(m.node.ID, m.ch, m.capVer, m.stopFromBatcher); err != nil { //nolint:noinlineerr
 		m.log.Error().Caller().Err(err).Msg("failed to add node to batcher")
+		// Write an explicit error rather than returning silently: a bare
+		// return leaves net/http to send an empty 200, which the client
+		// reads as "unexpected EOF" and retries forever (issue #3346).
+		httpError(m.w, err)
+
 		return
 	}

@@ -7,12 +7,15 @@ import (
 	"testing"
 	"time"

+	"github.com/juanfont/headscale/hscontrol/db"
 	"github.com/juanfont/headscale/hscontrol/mapper"
 	"github.com/juanfont/headscale/hscontrol/state"
+	"github.com/juanfont/headscale/hscontrol/types"
 	"github.com/juanfont/headscale/hscontrol/types/change"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"tailscale.com/tailcfg"
+	"tailscale.com/types/key"
 )

 type delayedSuccessResponseWriter struct {
@@ -89,6 +92,192 @@ func (w *delayedSuccessResponseWriter) WriteCount() int {
 	return w.writeCount
 }

+// recordingResponseWriter records the status code and whether anything was
+// written, so a test can tell an explicit error response apart from a handler
+// that returned without writing (which net/http turns into an empty 200 the
+// client reads as "unexpected EOF").
+type recordingResponseWriter struct {
+	mu     sync.Mutex
+	header http.Header
+	status int
+	writes int
+}
+
+func (w *recordingResponseWriter) Header() http.Header {
+	if w.header == nil {
+		w.header = make(http.Header)
+	}
+
+	return w.header
+}
+
+func (w *recordingResponseWriter) WriteHeader(code int) {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	if w.status == 0 {
+		w.status = code
+	}
+}
+
+func (w *recordingResponseWriter) Write(data []byte) (int, error) {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	if w.status == 0 {
+		w.status = http.StatusOK
+	}
+
+	w.writes++
+
+	return len(data), nil
+}
+
+func (w *recordingResponseWriter) Flush() {}
+
+func (w *recordingResponseWriter) statusCode() int {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	return w.status
+}
+
+// TestServeLongPollWritesErrorWhenInitialMapFails proves that when the initial
+// map cannot be generated (here: the node's own GivenName is invalid, so
+// WithSelfNode fails and AddNode errors), serveLongPoll writes an explicit HTTP
+// error instead of returning with no body. Returning empty leaves net/http to
+// send an empty 200, which the Tailscale client reports as
+// "PollNetMap: ... unexpected EOF" and retries forever (issue #3346).
+func TestServeLongPollWritesErrorWhenInitialMapFails(t *testing.T) {
+	app := createTestApp(t)
+	user := app.state.CreateUserForTest("self-bad-name-user")
+	createdNode := app.state.CreateRegisteredNodeForTest(user, "self-bad-name-node")
+
+	// Corrupt the node's stored name to empty so GetFQDN fails for itself,
+	// then reload state so the bad row enters the NodeStore verbatim.
+	app.mapBatcher.Close()
+	require.NoError(t, app.state.Close())
+
+	database, err := db.NewHeadscaleDatabase(app.cfg)
+	require.NoError(t, err)
+	require.NoError(t, database.DB.
+		Model(&types.Node{}).
+		Where("id = ?", createdNode.ID).
+		Update("given_name", "").Error)
+	require.NoError(t, database.Close())
+
+	app.state, err = state.NewState(app.cfg)
+	require.NoError(t, err)
+
+	app.mapBatcher = mapper.NewBatcherAndMapper(app.cfg, app.state)
+	app.mapBatcher.Start()
+
+	t.Cleanup(func() {
+		app.mapBatcher.Close()
+		require.NoError(t, app.state.Close())
+	})
+
+	nodeView, ok := app.state.GetNodeByID(createdNode.ID)
+	require.True(t, ok)
+
+	node := nodeView.AsStruct()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	writer := &recordingResponseWriter{}
+	session := app.newMapSession(ctx, tailcfg.MapRequest{
+		Stream:  true,
+		Version: tailcfg.CapabilityVersion(100),
+	}, writer, node)
+
+	serveDone := make(chan struct{})
+
+	go func() {
+		session.serveLongPoll()
+		close(serveDone)
+	}()
+
+	t.Cleanup(func() {
+		// Break the post-disconnect reconnect wait so the goroutine exits.
+		dummyCh := make(chan *tailcfg.MapResponse, 1)
+		_ = app.mapBatcher.AddNode(node.ID, dummyCh, tailcfg.CapabilityVersion(100), nil)
+
+		cancel()
+
+		select {
+		case <-serveDone:
+		case <-time.After(2 * time.Second):
+		}
+
+		_ = app.mapBatcher.RemoveNode(node.ID, dummyCh)
+	})
+
+	assert.Eventually(t, func() bool {
+		return writer.statusCode() >= http.StatusInternalServerError
+	}, 2*time.Second, 10*time.Millisecond,
+		"serveLongPoll must write an HTTP error response when the initial map cannot be built, not an empty 200")
+}
+
+// TestFailedReconnectDoesNotCancelEphemeralGC proves that a
+// long-poll reconnect attempt which fails before [state.State.Connect] must
+// not cancel a previously armed ephemeral GC timer. Cancelling at the start of
+// [mapSession.serveLongPoll] left departed ephemeral nodes stuck offline with
+// no deletion scheduled (https://github.com/juanfont/headscale/issues/3382).
+func TestFailedReconnectDoesNotCancelEphemeralGC(t *testing.T) {
+	t.Parallel()
+
+	app := createTestApp(t)
+	app.StartEphemeralGCForTest(t)
+
+	user := app.state.CreateUserForTest("eph-gc-cancel-user")
+	pak, err := app.state.CreatePreAuthKey(user.TypedID(), false, true, nil, nil)
+	require.NoError(t, err)
+
+	machineKey := key.NewMachine()
+	nodeKey := key.NewNode()
+
+	_, err = app.handleRegister(context.Background(), tailcfg.RegisterRequest{
+		Auth: &tailcfg.RegisterResponseAuth{
+			AuthKey: pak.Key,
+		},
+		NodeKey: nodeKey.Public(),
+		Hostinfo: &tailcfg.Hostinfo{
+			Hostname: "eph-gc-cancel-node",
+		},
+		Expiry: time.Now().Add(24 * time.Hour),
+	}, machineKey.Public())
+	require.NoError(t, err)
+
+	nodeView, ok := app.state.GetNodeByNodeKey(nodeKey.Public())
+	require.True(t, ok)
+	require.True(t, nodeView.IsEphemeral(), "node must be ephemeral so Cancel would arm on long-poll")
+
+	node := nodeView.AsStruct()
+
+	// Arm a long-lived deletion timer — the state after a normal disconnect
+	// has called afterServeLongPoll. A long expiry avoids racing the
+	// fail-before-Connect path below.
+	app.ephemeralGC.Schedule(node.ID, time.Hour)
+	require.True(t, app.ephemeralGC.IsScheduled(node.ID), "test sanity: GC timer must be armed")
+
+	// Drop the node from the NodeStore so UpdateNodeFromMapRequest fails before
+	// Connect, while the session still carries an ephemeral AuthKey (so the
+	// old Cancel-on-entry path would clear the timer).
+	app.state.DeleteNodeFromStoreForTest(node.ID)
+
+	writer := &recordingResponseWriter{}
+	session := app.newMapSession(context.Background(), tailcfg.MapRequest{
+		Stream:  true,
+		Version: tailcfg.CapabilityVersion(100),
+	}, writer, node)
+
+	session.serveLongPoll()
+
+	assert.GreaterOrEqual(t, writer.statusCode(), http.StatusInternalServerError,
+		"failed reconnect must write an HTTP error before Connect")
+	assert.True(t, app.ephemeralGC.IsScheduled(node.ID),
+		"failed reconnect must not cancel the ephemeral GC timer (issue #3382)")
+}
+
 // TestGitHubIssue3129_TransientlyBlockedWriteDoesNotLeaveLiveStaleSession
 // tests the scenario reported in
 // https://github.com/juanfont/headscale/issues/3129.
@@ -299,6 +299,108 @@ drained:
 	c.startPoll(tb)
 }

+// LogoutAndDisconnect sends a logout [tailcfg.RegisterRequest] (expiry in
+// the past) and tears down the long-poll session, mirroring what
+// tailscaled does on `tailscale logout`. The server marks the node
+// expired; the poll teardown then triggers the server's disconnect
+// grace period, after which the node goes offline.
+//
+// Safe to call from non-test goroutines: errors are returned, not
+// fataled, so many clients can log out concurrently.
+func (c *TestClient) LogoutAndDisconnect(ctx context.Context) error {
+	err := c.direct.TryLogout(ctx)
+	if err != nil {
+		return fmt.Errorf("servertest: TryLogout(%s): %w", c.Name, err)
+	}
+
+	if c.pollCancel != nil {
+		c.pollCancel()
+
+		select {
+		case <-c.pollDone:
+		case <-ctx.Done():
+			return fmt.Errorf("servertest: LogoutAndDisconnect(%s): poll did not exit: %w", c.Name, ctx.Err())
+		}
+	}
+
+	return nil
+}
+
+// ReloginAndPoll logs the client back in after [TestClient.LogoutAndDisconnect]
+// and starts a fresh long-poll session. [controlclient.Direct.TryLogout] cleared
+// the persisted node key, so this generates a new NodeKey and re-registers with
+// the same pre-auth key and machine key — the same shape as a real client
+// running `tailscale up --authkey=...` after a logout.
+//
+// Safe to call from non-test goroutines.
+func (c *TestClient) ReloginAndPoll(ctx context.Context) error {
+	url, err := c.direct.TryLogin(ctx, controlclient.LoginDefault)
+	if err != nil {
+		return fmt.Errorf("servertest: TryLogin(%s): %w", c.Name, err)
+	}
+
+	if url != "" {
+		return fmt.Errorf("servertest: TryLogin(%s): unexpected auth URL %q (expected auto-auth with preauth key)", c.Name, url) //nolint:err113
+	}
+
+	// Clear stale netmap state from the previous session so that
+	// convergence waits observe only the new session's maps.
+	c.mu.Lock()
+	c.netmap = nil
+	c.mu.Unlock()
+
+	for {
+		select {
+		case <-c.updates:
+			continue
+		default:
+		}
+
+		break
+	}
+
+	c.pollCtx, c.pollCancel = context.WithCancel(context.Background())
+	c.pollDone = make(chan struct{})
+
+	go func() {
+		defer close(c.pollDone)
+
+		_ = c.direct.PollNetMap(c.pollCtx, c)
+	}()
+
+	return nil
+}
+
+// RestartPoll tears down the current long-poll session and immediately
+// starts a new one without re-registering, the way tailscaled restarts
+// its map poll on state-machine transitions (pause/unpause around
+// login). The node key is unchanged; the server sees a rapid
+// disconnect/reconnect.
+//
+// Safe to call from non-test goroutines.
+func (c *TestClient) RestartPoll(ctx context.Context) error {
+	if c.pollCancel != nil {
+		c.pollCancel()
+
+		select {
+		case <-c.pollDone:
+		case <-ctx.Done():
+			return fmt.Errorf("servertest: RestartPoll(%s): old poll did not exit: %w", c.Name, ctx.Err())
+		}
+	}
+
+	c.pollCtx, c.pollCancel = context.WithCancel(context.Background())
+	c.pollDone = make(chan struct{})
+
+	go func() {
+		defer close(c.pollDone)
+
+		_ = c.direct.PollNetMap(c.pollCtx, c)
+	}()
+
+	return nil
+}
+
 // ReconnectAfter disconnects, waits for d, then reconnects.
 // The timer works correctly with testing/synctest for
 // time-controlled tests.
@@ -1,12 +1,17 @@
 package servertest_test

 import (
+	"context"
 	"fmt"
+	"math/rand/v2"
+	"strings"
 	"testing"
 	"time"

 	"github.com/juanfont/headscale/hscontrol/servertest"
+	"github.com/juanfont/headscale/hscontrol/types"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 	"tailscale.com/types/netmap"
 )

@@ -116,3 +121,241 @@ func TestConnectionLifecycle(t *testing.T) {
 		}
 	})
 }
+
+// TestLogoutReloginAllClientsConverge is an in-process reproduction of the
+// flaky integration tests TestAuthKeyLogoutAndReloginSameUser,
+// TestAuthWebFlowLogoutAndReloginSameUser and
+// TestAuthWebFlowLogoutAndReloginNewUser: a full mesh of clients logs out,
+// the server marks every node expired and offline, then all clients log
+// back in near-simultaneously with fresh NodeKeys. In the flake, a subset
+// of clients never converges — their netmaps stay empty through the whole
+// retry window even though the server believes everything is connected.
+//
+// Each client here is a real [controlclient.Direct], so the client-side
+// netmap assembly semantics (full peer list vs. delta, patch handling for
+// unknown peers) match the real Tailscale client.
+func TestLogoutReloginAllClientsConverge(t *testing.T) {
+	if testing.Short() {
+		t.Skip("relogin convergence test includes 10s+ disconnect grace per iteration")
+	}
+
+	const (
+		numClients = 12
+		iterations = 4
+		// Maximum random delay between the relogins of different
+		// clients, so registrations and fresh map streams interleave
+		// the way concurrent `tailscale up` invocations do.
+		reloginStagger = 500 * time.Millisecond
+	)
+
+	// Production tuning: the integration flake happens with the default
+	// 800ms batch delay (large coalescing windows) and a multi-worker
+	// batcher, so reproduce with the same knobs.
+	h := servertest.NewHarness(t, numClients,
+		servertest.WithServerOptions(
+			servertest.WithBatchDelay(800*time.Millisecond),
+			servertest.WithBatcherWorkers(types.DefaultBatcherWorkers()),
+		),
+		servertest.WithConvergenceTimeout(60*time.Second),
+	)
+
+	for iteration := range iterations {
+		t.Logf("iteration %d: logging out all clients", iteration)
+		logoutAllAndWaitOffline(t, h)
+
+		t.Logf("iteration %d: relogging in all clients", iteration)
+
+		clients := h.Clients()
+		errs := make(chan error, len(clients))
+
+		for _, c := range clients {
+			go func() {
+				time.Sleep(rand.N(reloginStagger)) //nolint:forbidigo,gosec // intentional jitter so relogins interleave; weak random is fine
+
+				ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+				defer cancel()
+
+				errs <- c.ReloginAndPoll(ctx)
+			}()
+		}
+
+		for range clients {
+			require.NoError(t, <-errs)
+		}
+
+		// Every client must converge to the full mesh. A stuck client —
+		// the flake — sits at zero peers and fails here.
+		deadline := time.Now().Add(30 * time.Second)
+		for _, c := range clients {
+			waitForMeshOrDump(t, clients, c, numClients-1, time.Until(deadline))
+		}
+	}
+}
+
+// TestLogoutReloginWithPollChurn is the same logout/relogin storm as
+// [TestLogoutReloginAllClientsConverge], but each client also restarts its
+// map poll once or twice shortly after logging back in — without
+// re-registering — the way newer tailscaled versions cycle their map
+// session around login state transitions. The integration flake hits the
+// head and unstable clients, which churn their sessions far more than
+// older releases, so the rapid session replacement is the prime suspect.
+func TestLogoutReloginWithPollChurn(t *testing.T) {
+	if testing.Short() {
+		t.Skip("relogin convergence test includes 10s+ disconnect grace per iteration")
+	}
+
+	const (
+		numClients     = 12
+		iterations     = 4
+		reloginStagger = 500 * time.Millisecond
+	)
+
+	h := servertest.NewHarness(t, numClients,
+		servertest.WithServerOptions(
+			servertest.WithBatchDelay(800*time.Millisecond),
+			servertest.WithBatcherWorkers(types.DefaultBatcherWorkers()),
+		),
+		servertest.WithConvergenceTimeout(60*time.Second),
+	)
+
+	for iteration := range iterations {
+		t.Logf("iteration %d: logging out all clients", iteration)
+		logoutAllAndWaitOffline(t, h)
+
+		t.Logf("iteration %d: relogging in all clients with poll churn", iteration)
+
+		clients := h.Clients()
+		errs := make(chan error, len(clients))
+
+		for _, c := range clients {
+			go func() {
+				time.Sleep(rand.N(reloginStagger)) //nolint:forbidigo,gosec // intentional jitter so relogins interleave; weak random is fine
+
+				ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+				defer cancel()
+
+				err := c.ReloginAndPoll(ctx)
+				if err != nil {
+					errs <- err
+					return
+				}
+
+				// Churn the map session like a freshly logged-in
+				// tailscaled: restart the poll once or twice with
+				// small random gaps.
+				for range 1 + rand.IntN(2) { //nolint:gosec // weak random is fine for test jitter
+					time.Sleep(rand.N(400 * time.Millisecond)) //nolint:forbidigo,gosec // intentional jitter between poll restarts; weak random is fine
+
+					err = c.RestartPoll(ctx)
+					if err != nil {
+						errs <- err
+						return
+					}
+				}
+
+				errs <- nil
+			}()
+		}
+
+		for range clients {
+			require.NoError(t, <-errs)
+		}
+
+		deadline := time.Now().Add(30 * time.Second)
+		for _, c := range clients {
+			waitForMeshOrDump(t, clients, c, numClients-1, time.Until(deadline))
+		}
+	}
+}
+
+// logoutAllAndWaitOffline logs every client out concurrently, then blocks
+// until the server reports each node expired and offline — the integration
+// tests' logout barrier, including the ~10s disconnect grace period.
+func logoutAllAndWaitOffline(t *testing.T, h *servertest.TestHarness) {
+	t.Helper()
+
+	clients := h.Clients()
+	errs := make(chan error, len(clients))
+
+	for _, c := range clients {
+		go func() {
+			ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+			defer cancel()
+
+			errs <- c.LogoutAndDisconnect(ctx)
+		}()
+	}
+
+	for range clients {
+		require.NoError(t, <-errs)
+	}
+
+	st := h.Server.State()
+
+	require.EventuallyWithT(t, func(c *assert.CollectT) {
+		for _, node := range st.ListNodes().All() {
+			assert.True(c, node.IsExpired(), "node %d should be expired after logout", node.ID())
+			online := node.IsOnline()
+			assert.True(c, online.Valid() && !online.Get(), "node %d should be offline after logout", node.ID())
+		}
+	}, 30*time.Second, 100*time.Millisecond, "all nodes expired and offline after logout")
+}
+
+// waitForMeshOrDump waits until client c reports at least wantPeers peers.
+// On timeout it dumps every client's view of the mesh before failing, so a
+// reproduced flake shows exactly which clients are stuck and what they see.
+func waitForMeshOrDump(t *testing.T, all []*servertest.TestClient, c *servertest.TestClient, wantPeers int, timeout time.Duration) {
+	t.Helper()
+
+	deadline := time.After(timeout)
+	ticker := time.NewTicker(100 * time.Millisecond)
+
+	defer ticker.Stop()
+
+	for {
+		if nm := c.Netmap(); nm != nil && len(nm.Peers) >= wantPeers {
+			return
+		}
+
+		select {
+		case <-ticker.C:
+		case <-deadline:
+			for _, other := range all {
+				t.Logf("client %s netmap: %s", other.Name, describeNetmap(other))
+			}
+
+			nm := c.Netmap()
+
+			got := 0
+			if nm != nil {
+				got = len(nm.Peers)
+			}
+
+			t.Fatalf("client %s did not converge: want %d peers, got %d", c.Name, wantPeers, got)
+		}
+	}
+}
+
+// describeNetmap renders a client's current netmap as a compact string for
+// failure dumps: peer names with their expiry/online flags.
+func describeNetmap(c *servertest.TestClient) string {
+	nm := c.Netmap()
+	if nm == nil {
+		return "<nil>"
+	}
+
+	var out strings.Builder
+
+	fmt.Fprintf(&out, "%d peers:", len(nm.Peers))
+
+	for _, p := range nm.Peers {
+		hostname := "<no hostinfo>"
+		if hi := p.Hostinfo(); hi.Valid() {
+			hostname = hi.Hostname()
+		}
+
+		fmt.Fprintf(&out, " %s(id=%d expired=%t online=%v)", hostname, p.ID(), p.KeyExpiry().Before(time.Now()), p.Online())
+	}
+
+	return out.String()
+}
@@ -65,6 +65,13 @@ func WithBufferedChanSize(n int) ServerOption {
 	return func(c *serverConfig) { c.bufferedChanSize = n }
 }

+// WithBatcherWorkers sets the number of batcher worker goroutines.
+// Defaults to 1 for deterministic tests; pass
+// [types.DefaultBatcherWorkers] to match production concurrency.
+func WithBatcherWorkers(n int) ServerOption {
+	return func(c *serverConfig) { c.batcherWorkers = n }
+}
+
 // WithEphemeralTimeout sets the ephemeral node inactivity timeout.
 func WithEphemeralTimeout(d time.Duration) ServerOption {
 	return func(c *serverConfig) { c.ephemeralTimeout = d }
@@ -0,0 +1,127 @@
+package servertest_test
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/juanfont/headscale/hscontrol/servertest"
+	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/stretchr/testify/require"
+	"tailscale.com/tailcfg"
+)
+
+// TestSSHCheckReDelegatesWhenSessionMissing exercises the fix for
+// https://github.com/juanfont/headscale/issues/3305 with a real control
+// client. The dst node runs the SSH-check poll over its actual Noise
+// connection: it first obtains a genuine HoldAndDelegate auth_id, that auth
+// session is then dropped from the cache (as it would be on expiry, eviction,
+// or a control-plane restart), and the follow-up poll for the now-missing
+// session must re-delegate a fresh HoldAndDelegate rather than dead-ending the
+// client with an error it keeps retrying until the SSH connection times out.
+func TestSSHCheckReDelegatesWhenSessionMissing(t *testing.T) {
+	t.Parallel()
+
+	h := servertest.NewHarness(t, 2)
+
+	srcID := types.NodeID(h.Client(0).Netmap().SelfNode.ID()) //nolint:gosec
+	dstID := types.NodeID(h.Client(1).Netmap().SelfNode.ID()) //nolint:gosec
+
+	// Subject the same-user (src, dst) pair to an SSH check.
+	h.ChangePolicy(t, []byte(`{
+		"ssh": [{
+			"action": "check",
+			"src": ["harness-default@"],
+			"dst": ["autogroup:self"],
+			"users": ["autogroup:nonroot"]
+		}]
+	}`))
+
+	// Sanity: the policy must actually subject this pair to a check, otherwise
+	// the test would pass for the wrong reason.
+	_, checkFound := h.Server.State().SSHCheckParams(srcID, dstID)
+	require.True(t, checkFound, "test setup: (src, dst) must be subject to an SSH check")
+
+	// The dst node's first poll yields a real HoldAndDelegate carrying a real,
+	// cached auth_id — nothing is fabricated.
+	initial := pollSSHAction(t, h.Server.URL, h.Client(1), srcID, dstID, "")
+	require.NotEmpty(t, initial.HoldAndDelegate, "initial poll must hold and delegate, got %+v", initial)
+
+	authID := authIDFromHoldURL(t, initial.HoldAndDelegate)
+	_, ok := h.Server.State().GetAuthCacheEntry(authID)
+	require.True(t, ok, "the auth session must be cached after the initial poll")
+
+	// Drop the session, reproducing a natural loss (expiry/eviction/restart).
+	h.Server.State().DeleteAuthCacheEntryForTest(authID)
+	_, ok = h.Server.State().GetAuthCacheEntry(authID)
+	require.False(t, ok, "the auth session must be gone before the follow-up poll")
+
+	// The follow-up poll carries the real auth_id whose session is now missing.
+	// With an active check the server must re-delegate a fresh session.
+	followUp := pollSSHAction(t, h.Server.URL, h.Client(1), srcID, dstID, authID.String())
+	require.NotEmpty(t, followUp.HoldAndDelegate,
+		"a missing session under an active check must re-delegate, got %+v", followUp)
+
+	require.NotEqual(t, authID, authIDFromHoldURL(t, followUp.HoldAndDelegate),
+		"re-delegation must mint a fresh auth_id")
+}
+
+// pollSSHAction issues an /machine/ssh/action poll from the given node over its
+// real Noise connection, as tailscaled does. An empty authID is the initial
+// poll; a non-empty one is a follow-up.
+func pollSSHAction(
+	t *testing.T,
+	serverURL string,
+	node *servertest.TestClient,
+	srcID, dstID types.NodeID,
+	authID string,
+) tailcfg.SSHAction {
+	t.Helper()
+
+	actionURL := fmt.Sprintf("%s/machine/ssh/action/%d/to/%d", serverURL, srcID, dstID)
+	if authID != "" {
+		actionURL += "?auth_id=" + authID
+	}
+
+	// Noise requests are addressed with the https scheme; the control client
+	// routes them over the established Noise connection (mirroring how
+	// controlclient issues its own register/map calls).
+	actionURL = strings.Replace(actionURL, "http://", "https://", 1)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, actionURL, nil)
+	require.NoError(t, err)
+
+	resp, err := node.Direct().DoNoiseRequest(req)
+	require.NoError(t, err)
+
+	defer resp.Body.Close()
+
+	require.Equal(t, http.StatusOK, resp.StatusCode, "ssh action poll must return 200")
+
+	var action tailcfg.SSHAction
+	require.NoError(t, json.NewDecoder(resp.Body).Decode(&action))
+
+	return action
+}
+
+// authIDFromHoldURL extracts the auth_id query parameter from a HoldAndDelegate
+// URL.
+func authIDFromHoldURL(t *testing.T, holdURL string) types.AuthID {
+	t.Helper()
+
+	u, err := url.Parse(holdURL)
+	require.NoError(t, err)
+
+	authID, err := types.AuthIDFromString(u.Query().Get("auth_id"))
+	require.NoError(t, err, "HoldAndDelegate URL missing a valid auth_id: %s", holdURL)
+
+	return authID
+}
@@ -0,0 +1,42 @@
+package state
+
+import (
+	"net/netip"
+	"testing"
+
+	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"tailscale.com/tailcfg"
+)
+
+// TestAutoApproveBatchApprovesRoutes verifies the batched autoApproveNodes still
+// approves a node's advertised route when policy auto-approvers permit it. The
+// batching collapses the per-node SetApprovedRoutes calls into one NodeStore
+// update and one policy rebuild; this guards that correctness is preserved.
+func TestAutoApproveBatchApprovesRoutes(t *testing.T) {
+	_, s, nodeID := persistTestSetup(t)
+	t.Cleanup(func() { _ = s.Close() })
+
+	route := netip.MustParsePrefix("10.0.0.0/24")
+
+	_, ok := s.nodeStore.UpdateNode(nodeID, func(n *types.Node) {
+		n.Hostinfo = &tailcfg.Hostinfo{RoutableIPs: []netip.Prefix{route}}
+	})
+	require.True(t, ok)
+
+	pol := `{
+		"autoApprovers": {"routes": {"10.0.0.0/24": ["persist-user@"]}},
+		"acls": [{"action": "accept", "src": ["*"], "dst": ["*:*"]}]
+	}`
+	_, err := s.SetPolicy([]byte(pol))
+	require.NoError(t, err)
+
+	_, err = s.ReloadPolicy()
+	require.NoError(t, err)
+
+	nv, ok := s.GetNodeByID(nodeID)
+	require.True(t, ok)
+	assert.Contains(t, nv.ApprovedRoutes().AsSlice(), route,
+		"auto-approver should have approved the advertised route")
+}
@@ -0,0 +1,279 @@
+package state
+
+import (
+	"net/netip"
+	"testing"
+
+	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/juanfont/headscale/hscontrol/types/change"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"tailscale.com/tailcfg"
+)
+
+// runtimePeerComputationReasons returns the Reason of every change in cs that
+// carries RequiresRuntimePeerComputation. Each such change makes the batcher
+// rebuild a full netmap (packet filters, SSH policy, peer serialization) for
+// every connected node, so it is the expensive fan-out the issue is about.
+func runtimePeerComputationReasons(cs []change.Change) []string {
+	var reasons []string
+
+	for _, c := range cs {
+		if c.RequiresRuntimePeerComputation {
+			reasons = append(reasons, c.Reason)
+		}
+	}
+
+	return reasons
+}
+
+// hasPeerPatch reports whether any change carries a lightweight PeerChange
+// patch (e.g. the online/offline indicator). This is the cheap notification a
+// reconnect should produce instead of a full runtime recompute.
+func hasPeerPatch(cs []change.Change) bool {
+	for _, c := range cs {
+		if len(c.PeerPatches) > 0 {
+			return true
+		}
+	}
+
+	return false
+}
+
+// forcesPeerRecompute reports whether any change makes peers rebuild a full
+// netmap, whether via a full update (subnet-router path) or a runtime peer
+// computation (relay/via path).
+func forcesPeerRecompute(cs []change.Change) bool {
+	for _, c := range cs {
+		if c.IsFull() || c.RequiresRuntimePeerComputation {
+			return true
+		}
+	}
+
+	return false
+}
+
+// TestConnectDisconnectOrdinaryNodeNoRuntimeRecompute asserts that an ordinary
+// node coming online or going offline only sends the lightweight online/offline
+// peer patch and does not trigger a runtime peer recompute.
+//
+// State.Connect and State.Disconnect gate change.PolicyChange() (which sets
+// RequiresRuntimePeerComputation, forcing the batcher to rebuild a full netmap
+// for every connected node) on NodeNeedsPeerRecompute. An ordinary node is
+// neither a subnet router, a relay target, nor a via target, so the gate is
+// false and no recompute is emitted.
+//
+// Emitting that recompute unconditionally turned each reconnect into O(N) full
+// netmap rebuilds (and a reconnect storm into O(N^2)), which saturated CPU
+// after the v0.28 -> v0.29 upgrade.
+func TestConnectDisconnectOrdinaryNodeNoRuntimeRecompute(t *testing.T) {
+	_, s, nodeID := persistTestSetup(t)
+	t.Cleanup(func() { _ = s.Close() })
+
+	t.Run("connect", func(t *testing.T) {
+		cs, epoch := s.Connect(nodeID)
+		require.NotZero(t, epoch, "Connect should return a session epoch")
+
+		assert.True(t, hasPeerPatch(cs),
+			"Connect should still emit a lightweight online peer patch")
+
+		reasons := runtimePeerComputationReasons(cs)
+		assert.Empty(t, reasons,
+			"ordinary node connect must not trigger a runtime peer recompute; "+
+				"got RequiresRuntimePeerComputation changes: %v", reasons)
+	})
+
+	t.Run("disconnect", func(t *testing.T) {
+		// Connect acquired a session in the connect subtest too; drain to the
+		// last release, which is the one that marks the node offline.
+		_, epoch := s.Connect(nodeID)
+		cs := drainSessions(t, s, nodeID, epoch)
+
+		assert.True(t, hasPeerPatch(cs),
+			"Disconnect should still emit a lightweight offline peer patch")
+
+		reasons := runtimePeerComputationReasons(cs)
+		assert.Empty(t, reasons,
+			"ordinary node disconnect must not trigger a runtime peer recompute; "+
+				"got RequiresRuntimePeerComputation changes: %v", reasons)
+	})
+}
+
+// TestConnectDisconnectRelayTargetTriggersRecompute locks the cap/relay case:
+// a relay target is not a subnet router, so the only thing that makes its
+// connect/disconnect emit a runtime peer recompute is the
+// NodeNeedsPeerRecompute gate. Peers must still receive that recompute so they
+// drop a stale PeerRelay allocation when the relay goes offline.
+func TestConnectDisconnectRelayTargetTriggersRecompute(t *testing.T) {
+	_, s, nodeID := persistTestSetup(t)
+	t.Cleanup(func() { _ = s.Close() })
+
+	// A cap/relay grant whose destination resolves to the node's owning
+	// user makes the node a relay target without making it a subnet router.
+	relayPolicy := `{"grants":[{"src":["*"],"dst":["persist-user@"],"app":{"tailscale.com/cap/relay":[{}]}}]}`
+	_, err := s.SetPolicy([]byte(relayPolicy))
+	require.NoError(t, err)
+
+	t.Run("connect", func(t *testing.T) {
+		cs, epoch := s.Connect(nodeID)
+		require.NotZero(t, epoch)
+
+		assert.NotEmpty(t, runtimePeerComputationReasons(cs),
+			"relay-target node connect must trigger a runtime peer recompute")
+	})
+
+	t.Run("disconnect", func(t *testing.T) {
+		_, epoch := s.Connect(nodeID)
+		cs := drainSessions(t, s, nodeID, epoch)
+
+		assert.NotEmpty(t, runtimePeerComputationReasons(cs),
+			"relay-target node disconnect must trigger a runtime peer recompute")
+	})
+}
+
+// TestConnectDisconnectSubnetRouterForcesRecompute guards that a subnet router
+// still forces peers to recompute on connect/disconnect (primary-route
+// failover changes their AllowedIPs), so the gate does not over-suppress.
+func TestConnectDisconnectSubnetRouterForcesRecompute(t *testing.T) {
+	_, s, nodeID := persistTestSetup(t)
+	t.Cleanup(func() { _ = s.Close() })
+
+	route := netip.MustParsePrefix("10.0.0.0/24")
+	_, ok := s.nodeStore.UpdateNode(nodeID, func(n *types.Node) {
+		n.Hostinfo = &tailcfg.Hostinfo{RoutableIPs: []netip.Prefix{route}}
+		n.ApprovedRoutes = []netip.Prefix{route}
+	})
+	require.True(t, ok)
+
+	t.Run("connect", func(t *testing.T) {
+		cs, epoch := s.Connect(nodeID)
+		require.NotZero(t, epoch)
+
+		assert.True(t, forcesPeerRecompute(cs),
+			"subnet router connect must force a peer recompute")
+	})
+
+	t.Run("disconnect", func(t *testing.T) {
+		_, epoch := s.Connect(nodeID)
+		cs := drainSessions(t, s, nodeID, epoch)
+
+		assert.True(t, forcesPeerRecompute(cs),
+			"subnet router disconnect must force a peer recompute")
+	})
+}
+
+// TestConnectDisconnectSubnetRouterEmitsPolicyChangeNotFull pins how a subnet
+// router forces that recompute: through the gated change.PolicyChange() (a
+// runtime peer recompute) and the lightweight online/offline peer patch, not a
+// full update. policyChangeResponse is a strict subset of a full update yet
+// still carries primary-route failover, so the heavier FullUpdate that the
+// online/offline change once emitted for subnet routers is unnecessary.
+func TestConnectDisconnectSubnetRouterEmitsPolicyChangeNotFull(t *testing.T) {
+	_, s, nodeID := persistTestSetup(t)
+	t.Cleanup(func() { _ = s.Close() })
+
+	route := netip.MustParsePrefix("10.0.0.0/24")
+	_, ok := s.nodeStore.UpdateNode(nodeID, func(n *types.Node) {
+		n.Hostinfo = &tailcfg.Hostinfo{RoutableIPs: []netip.Prefix{route}}
+		n.ApprovedRoutes = []netip.Prefix{route}
+	})
+	require.True(t, ok)
+
+	assertRecomputeNotFull := func(t *testing.T, cs []change.Change) {
+		t.Helper()
+
+		assert.NotEmpty(t, runtimePeerComputationReasons(cs),
+			"subnet router must still drive a runtime peer recompute")
+		assert.True(t, hasPeerPatch(cs),
+			"subnet router should still emit the lightweight online/offline patch")
+
+		for _, c := range cs {
+			assert.Falsef(t, c.IsFull(),
+				"subnet router recompute must be a PolicyChange, not a full update: %q", c.Reason)
+		}
+	}
+
+	t.Run("connect", func(t *testing.T) {
+		cs, epoch := s.Connect(nodeID)
+		require.NotZero(t, epoch)
+
+		assertRecomputeNotFull(t, cs)
+	})
+
+	t.Run("disconnect", func(t *testing.T) {
+		_, epoch := s.Connect(nodeID)
+		cs := drainSessions(t, s, nodeID, epoch)
+
+		assertRecomputeNotFull(t, cs)
+	})
+}
+
+// drainSessions releases poll sessions on nodeID until the node goes
+// offline, returning the changes from the final release (the one that
+// emits the offline notifications). Fails the test if the node is
+// still online after releasing as many sessions as Connect calls could
+// plausibly have acquired.
+func drainSessions(t *testing.T, s *State, nodeID types.NodeID, epoch uint64) []change.Change {
+	t.Helper()
+
+	// Arbitrary upper bound: comfortably above the number of Connect
+	// calls any test here makes. It only guards against looping
+	// forever when the node never goes offline.
+	const maxSessions = 16
+
+	for range maxSessions {
+		cs, err := s.Disconnect(nodeID, epoch)
+		require.NoError(t, err)
+
+		if len(cs) > 0 {
+			return cs
+		}
+	}
+
+	t.Fatalf("node %d still online after releasing %d sessions", nodeID, maxSessions)
+
+	return nil
+}
+
+// TestDisconnectOutOfOrderSessionsCannotStrandNodeOnline reproduces the
+// server side of the relogin flake at the state level: a cancelled map
+// request whose handler runs late acquires a session (and the newest
+// epoch) after the real session's Connect, then releases without taking
+// the node offline because the real session is still live. The real
+// session's release — carrying the older epoch — must still take the
+// node offline. Under the old epoch-equality gate it was rejected as
+// stale and the node stayed online forever.
+func TestDisconnectOutOfOrderSessionsCannotStrandNodeOnline(t *testing.T) {
+	_, s, nodeID := persistTestSetup(t)
+	t.Cleanup(func() { _ = s.Close() })
+
+	_, liveGen := s.Connect(nodeID)
+	_, zombieGen := s.Connect(nodeID)
+	require.Greater(t, zombieGen, liveGen, "late session must hold the newer epoch")
+
+	// The zombie session dies first; another session is live, so the node
+	// must stay online and no offline changes may be emitted.
+	cs, err := s.Disconnect(nodeID, zombieGen)
+	require.NoError(t, err)
+	assert.Empty(t, cs, "release with another live session must not emit changes")
+
+	nv, ok := s.GetNodeByID(nodeID)
+	require.True(t, ok)
+
+	online, known := nv.IsOnline().GetOk()
+	require.True(t, known)
+	assert.True(t, online, "node must stay online while the real session lives")
+
+	// The real session releases last, with the older epoch. This must take
+	// the node offline.
+	cs, err = s.Disconnect(nodeID, liveGen)
+	require.NoError(t, err)
+	assert.True(t, hasPeerPatch(cs), "final release must emit the offline peer patch")
+
+	nv, ok = s.GetNodeByID(nodeID)
+	require.True(t, ok)
+
+	online, known = nv.IsOnline().GetOk()
+	require.True(t, known)
+	assert.False(t, online, "node must be offline after its last session is released")
+}
@@ -111,3 +111,88 @@ func TestEndpointStorageInNodeStore(t *testing.T) {
 		}
 	}
 }
+
+// TestEndpointBroadcastWorthy verifies the gate that decides whether an
+// endpoint-only delta is worth fanning out to peers as an incremental
+// PeersChangedPatch. A delta that only adds STUN-derived endpoints (or only
+// removes endpoints) is suppressed: it is churny and unlikely to be useful,
+// and disco's callMeMaybe re-derives STUN paths anyway. Only deltas that
+// introduce a genuinely useful (non-STUN) endpoint are broadcast-worthy.
+func TestEndpointBroadcastWorthy(t *testing.T) {
+	local := netip.MustParseAddrPort("192.168.1.5:41641")
+	local2 := netip.MustParseAddrPort("192.168.1.6:41641")
+	stun := netip.MustParseAddrPort("203.0.113.7:41641")
+	stun2 := netip.MustParseAddrPort("203.0.113.8:41641")
+	portmap := netip.MustParseAddrPort("198.51.100.9:41641")
+
+	tests := []struct {
+		name    string
+		stored  []netip.AddrPort
+		newEPs  []netip.AddrPort
+		newType []tailcfg.EndpointType
+		want    bool
+	}{
+		{
+			name:    "adds only a STUN endpoint - suppress",
+			stored:  []netip.AddrPort{local},
+			newEPs:  []netip.AddrPort{local, stun},
+			newType: []tailcfg.EndpointType{tailcfg.EndpointLocal, tailcfg.EndpointSTUN},
+			want:    false,
+		},
+		{
+			name:    "adds only STUN4LocalPort - suppress",
+			stored:  []netip.AddrPort{local},
+			newEPs:  []netip.AddrPort{local, stun},
+			newType: []tailcfg.EndpointType{tailcfg.EndpointLocal, tailcfg.EndpointSTUN4LocalPort},
+			want:    false,
+		},
+		{
+			name:    "adds a useful local endpoint - broadcast",
+			stored:  []netip.AddrPort{stun},
+			newEPs:  []netip.AddrPort{stun, local},
+			newType: []tailcfg.EndpointType{tailcfg.EndpointSTUN, tailcfg.EndpointLocal},
+			want:    true,
+		},
+		{
+			name:    "adds a useful portmapped endpoint - broadcast",
+			stored:  []netip.AddrPort{local},
+			newEPs:  []netip.AddrPort{local, portmap},
+			newType: []tailcfg.EndpointType{tailcfg.EndpointLocal, tailcfg.EndpointPortmapped},
+			want:    true,
+		},
+		{
+			name:    "pure shrink, no additions - suppress",
+			stored:  []netip.AddrPort{local, local2},
+			newEPs:  []netip.AddrPort{local},
+			newType: []tailcfg.EndpointType{tailcfg.EndpointLocal},
+			want:    false,
+		},
+		{
+			name:   "nil types (older client) adding endpoint - broadcast",
+			stored: []netip.AddrPort{local},
+			newEPs: []netip.AddrPort{local, local2},
+			want:   true,
+		},
+		{
+			name:    "only STUN endpoints churn (replace one STUN with another) - suppress",
+			stored:  []netip.AddrPort{local, stun},
+			newEPs:  []netip.AddrPort{local, stun2},
+			newType: []tailcfg.EndpointType{tailcfg.EndpointLocal, tailcfg.EndpointSTUN},
+			want:    false,
+		},
+		{
+			name:    "mixed add: one STUN and one useful - broadcast",
+			stored:  []netip.AddrPort{local},
+			newEPs:  []netip.AddrPort{local, stun, local2},
+			newType: []tailcfg.EndpointType{tailcfg.EndpointLocal, tailcfg.EndpointSTUN, tailcfg.EndpointLocal},
+			want:    true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := endpointBroadcastWorthy(tt.stored, tt.newEPs, tt.newType)
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}
@@ -0,0 +1,74 @@
+package state
+
+import (
+	"strings"
+	"sync/atomic"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"gorm.io/gorm"
+	"tailscale.com/tailcfg"
+)
+
+// TestNoOpMapRequestSkipsPersist ensures an identical, no-op MapRequest does
+// not issue a database UPDATE (nor the O(n) policy SetNodes scan that follows
+// persistNodeToDB). The node state is unchanged, so persisting is pure waste on
+// the hot map-request path.
+func TestNoOpMapRequestSkipsPersist(t *testing.T) {
+	_, s, nodeID := persistTestSetup(t)
+	t.Cleanup(func() { _ = s.Close() })
+
+	var nodeUpdateCount atomic.Int64
+
+	gdb := s.DB().DB
+	cbName := "noop_count_node_updates"
+	err := gdb.Callback().Update().After("gorm:update").Register(cbName, func(tx *gorm.DB) {
+		if tx.Statement == nil {
+			return
+		}
+
+		if tx.Statement.Table == "nodes" ||
+			strings.Contains(strings.ToLower(tx.Statement.SQL.String()), "update \"nodes\"") {
+			nodeUpdateCount.Add(1)
+		}
+	})
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = gdb.Callback().Update().Remove(cbName) })
+
+	nv, ok := s.GetNodeByID(nodeID)
+	require.True(t, ok, "node should exist in NodeStore")
+
+	stored := nv.AsStruct()
+
+	req := tailcfg.MapRequest{
+		NodeKey:  stored.NodeKey,
+		DiscoKey: stored.DiscoKey,
+		Hostinfo: &tailcfg.Hostinfo{
+			Hostname: stored.Hostname,
+			NetInfo:  &tailcfg.NetInfo{PreferredDERP: 1},
+		},
+	}
+
+	// First request establishes the Hostinfo/DERP state (expected to persist).
+	_, err = s.UpdateNodeFromMapRequest(nodeID, req)
+	require.NoError(t, err)
+
+	nodeUpdateCount.Store(0)
+
+	// Second request is value-identical: a no-op.
+	req2 := tailcfg.MapRequest{
+		NodeKey:  stored.NodeKey,
+		DiscoKey: stored.DiscoKey,
+		Hostinfo: &tailcfg.Hostinfo{
+			Hostname: stored.Hostname,
+			NetInfo:  &tailcfg.NetInfo{PreferredDERP: 1},
+		},
+	}
+
+	_, err = s.UpdateNodeFromMapRequest(nodeID, req2)
+	require.NoError(t, err)
+
+	require.Equalf(t, int64(0), nodeUpdateCount.Load(),
+		"no-op MapRequest should not issue any nodes-table UPDATE, got %d",
+		nodeUpdateCount.Load())
+}
@@ -0,0 +1,92 @@
+package state
+
+import (
+	"fmt"
+
+	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/juanfont/headscale/hscontrol/util/zlog/zf"
+	"github.com/rs/zerolog/log"
+)
+
+// nodeHealthCheck names a class of stored-node-data defect that breaks normal
+// operation and explains how to fix it. ok == true means the node passes the
+// check. This is the extension point for node-data validation: add a check
+// here as new corrupt-data classes surface (nil hostinfo, invalid IPs,
+// tags-XOR-user violations, ...) and both the boot scan and any future caller
+// run the whole set.
+type nodeHealthCheck struct {
+	name  string
+	check func(nv types.NodeView, cfg *types.Config) (problem, fixHint string, ok bool)
+}
+
+// nodeHealthChecks is the registry of node-data health checks. Today it carries
+// the one issue #3346 needs; append to it rather than reshaping callers.
+var nodeHealthChecks = []nodeHealthCheck{givenNameMapsToValidFQDN}
+
+// givenNameMapsToValidFQDN flags a node whose stored GivenName cannot produce a
+// valid FQDN (empty, or longer than MaxHostnameLength once base_domain is
+// applied). Such a node cannot be rendered into a netmap — neither its own nor
+// any peer's — so it must be renamed to recover.
+var givenNameMapsToValidFQDN = nodeHealthCheck{
+	name: "given-name-maps-to-valid-fqdn",
+	check: func(nv types.NodeView, cfg *types.Config) (string, string, bool) {
+		err := types.ValidateGivenName(nv.GivenName(), cfg.BaseDomain)
+		if err != nil {
+			return err.Error(), fmt.Sprintf("headscale nodes rename %d <name>", nv.ID()), false
+		}
+
+		return "", "", true
+	},
+}
+
+// nodeHealthFinding is a single failed check for a single node.
+type nodeHealthFinding struct {
+	nodeID   types.NodeID
+	hostname string
+	check    string
+	problem  string
+	fixHint  string
+}
+
+// scanNodeHealth runs every registered check against every node in the store
+// and returns one finding per failure. It only reports — it never mutates a
+// node — so an operator can repair the underlying data without the server
+// silently rewriting a user-visible name.
+func (s *State) scanNodeHealth() []nodeHealthFinding {
+	var findings []nodeHealthFinding
+
+	for _, nv := range s.nodeStore.ListNodes().All() {
+		for _, c := range nodeHealthChecks {
+			problem, fixHint, ok := c.check(nv, s.cfg)
+			if ok {
+				continue
+			}
+
+			findings = append(findings, nodeHealthFinding{
+				nodeID:   nv.ID(),
+				hostname: nv.Hostname(),
+				check:    c.name,
+				problem:  problem,
+				fixHint:  fixHint,
+			})
+		}
+	}
+
+	return findings
+}
+
+// logNodeHealth scans the store once and logs an actionable warning per
+// finding. Called at startup so an operator learns — by node id and fix
+// command — about stored data that will break map generation, without the
+// server changing anything itself.
+func (s *State) logNodeHealth() {
+	for _, f := range s.scanNodeHealth() {
+		log.Warn().
+			Uint64(zf.NodeID, f.nodeID.Uint64()).
+			Str(zf.NodeHostname, f.hostname).
+			Str("check", f.check).
+			Str("problem", f.problem).
+			Str("fix", f.fixHint).
+			Msg("node has invalid data that breaks map generation; rename it to restore connectivity")
+	}
+}
@@ -0,0 +1,67 @@
+package state
+
+import (
+	"testing"
+
+	"github.com/juanfont/headscale/hscontrol/db"
+	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGivenNameMapsToValidFQDNCheck(t *testing.T) {
+	cfg := &types.Config{BaseDomain: "example.com"}
+
+	_, _, ok := givenNameMapsToValidFQDN.check((&types.Node{ID: 1, GivenName: "valid"}).View(), cfg)
+	require.True(t, ok, "a valid given name must pass the check")
+
+	problem, fixHint, ok := givenNameMapsToValidFQDN.check((&types.Node{ID: 7, GivenName: ""}).View(), cfg)
+	require.False(t, ok, "an empty given name must fail the check")
+	require.NotEmpty(t, problem)
+	require.Contains(t, fixHint, "rename 7", "fix hint must name the offending node")
+}
+
+// TestScanNodeHealthReportsInvalidNameWithoutMutating proves the boot scan
+// reports a node whose stored name would break map generation (issue #3346)
+// with an actionable fix, and that it never rewrites the stored name — the
+// maintainer's decision is log-only, no silent mutation.
+func TestScanNodeHealthReportsInvalidNameWithoutMutating(t *testing.T) {
+	dbPath := t.TempDir() + "/headscale.db"
+	cfg := persistTestConfig(dbPath)
+
+	database, err := db.NewHeadscaleDatabase(cfg)
+	require.NoError(t, err)
+
+	user := database.CreateUserForTest("scan-user")
+	bad := database.CreateRegisteredNodeForTest(user, "scan-bad")
+	good := database.CreateRegisteredNodeForTest(user, "scan-good")
+
+	require.NoError(t, database.DB.
+		Model(&types.Node{}).
+		Where("id = ?", bad.ID).
+		Update("given_name", "").Error)
+	require.NoError(t, database.Close())
+
+	s, err := NewState(cfg)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = s.Close() })
+
+	findings := s.scanNodeHealth()
+
+	var badFinding *nodeHealthFinding
+
+	for i := range findings {
+		require.NotEqual(t, good.ID, findings[i].nodeID, "a valid node must not be reported")
+
+		if findings[i].nodeID == bad.ID {
+			badFinding = &findings[i]
+		}
+	}
+
+	require.NotNil(t, badFinding, "a node with an invalid name must be reported")
+	require.Contains(t, badFinding.fixHint, "rename", "finding must carry an actionable fix")
+
+	// Log-only: neither the scan nor boot may rewrite the stored name.
+	nv, ok := s.GetNodeByID(bad.ID)
+	require.True(t, ok)
+	require.Empty(t, nv.GivenName(), "boot scan must not mutate the stored name")
+}
@@ -8,6 +8,7 @@ import (
 	"slices"
 	"strconv"
 	"strings"
+	"sync"
 	"sync/atomic"
 	"time"

@@ -107,6 +108,12 @@ type NodeStore struct {
 	peersFunc  PeersFunc
 	writeQueue chan work

+	// stopped is closed once by Stop to signal the writer goroutine to exit
+	// and to let in-flight writes return cleanly instead of panicking with
+	// "send on closed channel" during shutdown.
+	stopped  chan struct{}
+	stopOnce sync.Once
+
 	batchSize    int
 	batchTimeout time.Duration
 }
@@ -123,6 +130,7 @@ func NewNodeStore(allNodes types.Nodes, peersFunc PeersFunc, batchSize int, batc
 		peersFunc:    peersFunc,
 		batchSize:    batchSize,
 		batchTimeout: batchTimeout,
+		stopped:      make(chan struct{}),
 	}
 	store.data.Store(&snap)

@@ -199,7 +207,13 @@ func (s *NodeStore) PutNode(n types.Node) types.NodeView {

 	nodeStoreQueueDepth.Inc()

-	s.writeQueue <- work
+	select {
+	case s.writeQueue <- work:
+	case <-s.stopped:
+		nodeStoreQueueDepth.Dec()
+
+		return types.NodeView{}
+	}

 	<-work.result
 	nodeStoreQueueDepth.Dec()
@@ -258,7 +272,13 @@ func (s *NodeStore) UpdateNodes(updates map[types.NodeID]UpdateNodeFunc) {

 	nodeStoreQueueDepth.Inc()

-	s.writeQueue <- w
+	select {
+	case s.writeQueue <- w:
+	case <-s.stopped:
+		nodeStoreQueueDepth.Dec()
+
+		return
+	}

 	<-w.result
 	nodeStoreQueueDepth.Dec()
@@ -280,7 +300,13 @@ func (s *NodeStore) DeleteNode(id types.NodeID) {

 	nodeStoreQueueDepth.Inc()

-	s.writeQueue <- work
+	select {
+	case s.writeQueue <- work:
+	case <-s.stopped:
+		nodeStoreQueueDepth.Dec()
+
+		return
+	}

 	<-work.result
 	nodeStoreQueueDepth.Dec()
@@ -317,7 +343,13 @@ func (s *NodeStore) SetGivenName(id types.NodeID, name string) (types.NodeView,

 	nodeStoreQueueDepth.Inc()

-	s.writeQueue <- w
+	select {
+	case s.writeQueue <- w:
+	case <-s.stopped:
+		nodeStoreQueueDepth.Dec()
+
+		return types.NodeView{}, nil
+	}

 	<-w.result
 	nodeStoreQueueDepth.Dec()
@@ -338,9 +370,13 @@ func (s *NodeStore) Start() {
 	go s.processWrite()
 }

-// Stop stops the [NodeStore].
+// Stop stops the [NodeStore]. It signals the writer goroutine via stopped
+// rather than closing writeQueue, so writes racing shutdown drop cleanly
+// instead of panicking on a closed channel.
 func (s *NodeStore) Stop() {
-	close(s.writeQueue)
+	s.stopOnce.Do(func() {
+		close(s.stopped)
+	})
 }

 // processWrite processes the write queue in batches.
@@ -352,16 +388,7 @@ func (s *NodeStore) processWrite() {

 	for {
 		select {
-		case w, ok := <-s.writeQueue:
-			if !ok {
-				// Channel closed, apply any remaining batch and exit
-				if len(batch) != 0 {
-					s.applyBatch(batch)
-				}
-
-				return
-			}
-
+		case w := <-s.writeQueue:
 			batch = append(batch, w)
 			if len(batch) >= s.batchSize {
 				s.applyBatch(batch)
@@ -376,6 +403,14 @@ func (s *NodeStore) processWrite() {
 			}

 			c.Reset(s.batchTimeout)
+		case <-s.stopped:
+			// Apply any remaining batch so in-flight writers receive their
+			// results, then exit.
+			if len(batch) != 0 {
+				s.applyBatch(batch)
+			}
+
+			return
 		}
 	}
 }
@@ -752,44 +787,27 @@ func (s *NodeStore) GetNodeByNodeKey(nodeKey key.NodePublic) (types.NodeView, bo
 	return nodeView, exists
 }

-// GetNodeByMachineKey returns a node by its machine key and user ID. The bool indicates if the node exists.
-func (s *NodeStore) GetNodeByMachineKey(machineKey key.MachinePublic, userID types.UserID) (types.NodeView, bool) {
-	timer := prometheus.NewTimer(nodeStoreOperationDuration.WithLabelValues("get_by_machine_key"))
+// GetNodesByMachineKeyAllUsers returns every node sharing machineKey, keyed by
+// owning UserID. Tagged nodes are indexed under UserID(0) (the tagged sentinel);
+// user-owned nodes under their owning UserID. Returns an empty map if none.
+//
+// One machine key can map to several nodes (the same device registered by
+// different users via the "create new, do not transfer" path). Exposing the
+// whole set lets callers decide with full context — index [userID] for an exact
+// match, [0] for a tagged node, or reject when the set is ambiguous — rather
+// than guessing from a single arbitrary pick.
+func (s *NodeStore) GetNodesByMachineKeyAllUsers(machineKey key.MachinePublic) map[types.UserID]types.NodeView {
+	timer := prometheus.NewTimer(nodeStoreOperationDuration.WithLabelValues("get_nodes_by_machine_key_all_users"))
 	defer timer.ObserveDuration()

-	nodeStoreOperations.WithLabelValues("get_by_machine_key").Inc()
+	nodeStoreOperations.WithLabelValues("get_nodes_by_machine_key_all_users").Inc()

-	snapshot := s.data.Load()
-	if userMap, exists := snapshot.nodesByMachineKey[machineKey]; exists {
-		if node, exists := userMap[userID]; exists {
-			return node, true
-		}
-	}
+	userMap := s.data.Load().nodesByMachineKey[machineKey]

-	return types.NodeView{}, false
-}
+	out := make(map[types.UserID]types.NodeView, len(userMap))
+	maps.Copy(out, userMap)

-// GetNodeByMachineKeyAnyUser returns the first node with the given machine key,
-// regardless of which user it belongs to. This is useful for scenarios like
-// transferring a node to a different user when re-authenticating with a
-// different user's auth key.
-// If multiple nodes exist with the same machine key (different users), the
-// first one found is returned (order is not guaranteed).
-func (s *NodeStore) GetNodeByMachineKeyAnyUser(machineKey key.MachinePublic) (types.NodeView, bool) {
-	timer := prometheus.NewTimer(nodeStoreOperationDuration.WithLabelValues("get_by_machine_key_any_user"))
-	defer timer.ObserveDuration()
-
-	nodeStoreOperations.WithLabelValues("get_by_machine_key_any_user").Inc()
-
-	snapshot := s.data.Load()
-	if userMap, exists := snapshot.nodesByMachineKey[machineKey]; exists {
-		// Return the first node found (order not guaranteed due to map iteration)
-		for _, node := range userMap {
-			return node, true
-		}
-	}
-
-	return types.NodeView{}, false
+	return out
 }

 // DebugString returns debug information about the [NodeStore].
@@ -0,0 +1,35 @@
+package state
+
+import (
+	"sync"
+	"testing"
+
+	"github.com/juanfont/headscale/hscontrol/types"
+)
+
+// TestNodeStoreWriteDuringStopNoPanic ensures a write racing with Stop does not
+// panic with "send on closed channel". During graceful shutdown a grace-period
+// Disconnect (or a scheduled HA probe result) can still issue a NodeStore write
+// after Stop has run; that write must be either applied or cleanly dropped,
+// never crash the process.
+func TestNodeStoreWriteDuringStopNoPanic(t *testing.T) {
+	const iterations = 200
+
+	for range iterations {
+		store := NewNodeStore(nil, allowAllPeersFunc, TestBatchSize, TestBatchTimeout)
+		store.Start()
+
+		var wg sync.WaitGroup
+
+		wg.Go(func() {
+			node := createConcurrentTestNode(types.NodeID(1), "grace-period-node")
+			store.PutNode(node)
+		})
+
+		wg.Go(func() {
+			store.Stop()
+		})
+
+		wg.Wait()
+	}
+}
@@ -1321,3 +1321,63 @@ func TestRebuildPeerMapsWithChangedPeersFunc(t *testing.T) {
 	assert.Equal(t, 1, peers1.Len(), "ListPeers for node1 should return 1")
 	assert.Equal(t, 1, peers2.Len(), "ListPeers for node2 should return 1")
 }
+
+// TestGetNodesByMachineKeyAllUsers ensures the lookup returns every node sharing
+// a machine key keyed by owning UserID (tagged nodes under UserID(0)), so callers
+// see the full set instead of a single arbitrary pick.
+func TestGetNodesByMachineKeyAllUsers(t *testing.T) {
+	mk := key.NewMachine().Public()
+
+	t.Run("empty when absent", func(t *testing.T) {
+		store := NewNodeStore(nil, allowAllPeersFunc, TestBatchSize, TestBatchTimeout)
+
+		store.Start()
+		defer store.Stop()
+
+		require.Empty(t, store.GetNodesByMachineKeyAllUsers(mk))
+	})
+
+	t.Run("returns all user-owned nodes keyed by user", func(t *testing.T) {
+		store := NewNodeStore(nil, allowAllPeersFunc, TestBatchSize, TestBatchTimeout)
+
+		store.Start()
+		defer store.Stop()
+
+		n1 := createTestNode(1, 1, "user1", "node1")
+		n1.MachineKey = mk
+		n2 := createTestNode(2, 2, "user2", "node2")
+		n2.MachineKey = mk
+
+		store.PutNode(n1)
+		store.PutNode(n2)
+
+		all := store.GetNodesByMachineKeyAllUsers(mk)
+		require.Len(t, all, 2)
+		require.Equal(t, types.NodeID(1), all[types.UserID(1)].ID())
+		require.Equal(t, types.NodeID(2), all[types.UserID(2)].ID())
+	})
+
+	t.Run("tagged node indexed under UserID(0)", func(t *testing.T) {
+		store := NewNodeStore(nil, allowAllPeersFunc, TestBatchSize, TestBatchTimeout)
+
+		store.Start()
+		defer store.Stop()
+
+		owned := createTestNode(1, 1, "user1", "node1")
+		owned.MachineKey = mk
+		tagged := createTestNode(3, 3, "user3", "node3")
+		tagged.MachineKey = mk
+		tagged.UserID = nil
+		tagged.User = nil
+		tagged.Tags = []string{"tag:foo"}
+
+		store.PutNode(owned)
+		store.PutNode(tagged)
+
+		all := store.GetNodesByMachineKeyAllUsers(mk)
+		require.Len(t, all, 2)
+		require.Equal(t, types.NodeID(1), all[types.UserID(1)].ID())
+		require.True(t, all[types.UserID(0)].IsTagged())
+		require.Equal(t, types.NodeID(3), all[types.UserID(0)].ID())
+	})
+}
@@ -0,0 +1,71 @@
+package state
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"tailscale.com/tailcfg"
+)
+
+// TestPersistNodeDoesNotClobberConcurrentAdminWrite ensures that persisting a
+// node snapshot captured earlier (as UpdateNodeFromMapRequest does at the top
+// of its body) cannot overwrite a concurrent admin write (SetNodeTags) that
+// landed in between. NodeStore is the source of truth; the database row must
+// converge on it rather than reverting to the stale snapshot.
+func TestPersistNodeDoesNotClobberConcurrentAdminWrite(t *testing.T) {
+	dbPath, s, nodeID := persistTestSetup(t)
+
+	pol := `{
+		"tagOwners": {"tag:foo": ["persist-user@"]},
+		"acls": [{"action": "accept", "src": ["*"], "dst": ["*:*"]}]
+	}`
+	_, err := s.SetPolicy([]byte(pol))
+	require.NoError(t, err)
+
+	before, ok := s.GetNodeByID(nodeID)
+	require.True(t, ok)
+	require.False(t, before.IsTagged(), "node should start user-owned")
+	require.True(t, before.UserID().Valid(), "node should start with a UserID")
+
+	// (1) Map-request captures the node snapshot (the stale view).
+	staleView, ok := s.nodeStore.GetNode(nodeID)
+	require.True(t, ok)
+
+	staleNode := staleView.AsStruct()
+	staleNode.Hostinfo = &tailcfg.Hostinfo{Hostname: "persist-node"}
+	staleView = staleNode.View()
+
+	// (2) Concurrent admin SetNodeTags lands in the window: NodeStore + DB
+	// become tagged and user ownership is cleared.
+	_, _, err = s.SetNodeTags(nodeID, []string{"tag:foo"})
+	require.NoError(t, err)
+
+	dbAfterAdmin, err := s.DB().GetNodeByID(nodeID)
+	require.NoError(t, err)
+	require.Equal(t, []string{"tag:foo"}, dbAfterAdmin.Tags.List(),
+		"precondition: admin SetNodeTags must have written the tag to the DB")
+
+	// (3) Map-request persists its stale snapshot.
+	_, _, err = s.persistNodeToDB(staleView)
+	require.NoError(t, err)
+
+	// The admin write must survive.
+	dbFinal, err := s.DB().GetNodeByID(nodeID)
+	require.NoError(t, err)
+	assert.Equal(t, []string{"tag:foo"}, dbFinal.Tags.List(),
+		"DB tags must reflect the admin SetNodeTags, not the stale persist")
+	assert.Nil(t, dbFinal.UserID,
+		"DB UserID must stay nil after tagging (tags XOR user ownership)")
+
+	// Restart: the divergence would surface here in production.
+	require.NoError(t, s.Close())
+	s2 := persistTestReopen(t, dbPath)
+
+	reloaded, ok := s2.GetNodeByID(nodeID)
+	require.True(t, ok, "node should reload from DB after restart")
+	assert.True(t, reloaded.IsTagged(),
+		"after restart the node must still be tagged")
+	assert.Equal(t, []string{"tag:foo"}, reloaded.AsStruct().Tags.List(),
+		"after restart the node must still carry tag:foo")
+}
@@ -1,13 +1,20 @@
 package state

 import (
+	"errors"
 	"net/netip"
+	"sync"
 	"testing"
+	"time"

 	"github.com/juanfont/headscale/hscontrol/db"
 	"github.com/juanfont/headscale/hscontrol/types"
+	"github.com/juanfont/headscale/hscontrol/util"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"gorm.io/gorm"
+	"tailscale.com/tailcfg"
+	"tailscale.com/types/key"
 )

 // persistTestSetup pre-creates a sqlite database on disk with a single
@@ -209,3 +216,369 @@ func TestPersistEmptyEndpoints(t *testing.T) {
 	assert.Empty(t, nv.AsStruct().Endpoints,
 		"after restart, NodeStore should reflect the cleared endpoints")
 }
+
+// TestRegistrationRejectsNodeKeyClaimedByAnotherMachine proves a new
+// registration cannot claim a NodeKey already bound to a different machine.
+// NodeKeys are public (peers learn them from the netmap), so without this
+// check an authenticated party can register a node carrying a victim's
+// NodeKey. That poisons the NodeStore NodeKey index (a map keyed on NodeKey,
+// last writer wins), so the victim's MapRequest resolves to the attacker's
+// node and is rejected by getAndValidateNode's MachineKey check (noise.go) —
+// a denial of service against the victim. getAndValidateNode already enforces
+// a 1:1 NodeKey<->MachineKey binding at poll time; this enforces the same
+// invariant at registration time.
+func TestRegistrationRejectsNodeKeyClaimedByAnotherMachine(t *testing.T) {
+	dbPath := t.TempDir() + "/headscale.db"
+	cfg := persistTestConfig(dbPath)
+
+	database, err := db.NewHeadscaleDatabase(cfg)
+	require.NoError(t, err)
+
+	user := database.CreateUserForTest("nk-user")
+	require.NoError(t, database.Close())
+
+	s, err := NewState(cfg)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = s.Close() })
+
+	sharedNodeKey := key.NewNode()
+
+	_, err = s.createAndSaveNewNode(newNodeParams{
+		User:           *user,
+		MachineKey:     key.NewMachine().Public(),
+		NodeKey:        sharedNodeKey.Public(),
+		DiscoKey:       key.NewDisco().Public(),
+		Hostname:       "victim",
+		RegisterMethod: util.RegisterMethodCLI,
+	})
+	require.NoError(t, err)
+
+	// A different machine tries to register carrying the victim's NodeKey.
+	_, err = s.createAndSaveNewNode(newNodeParams{
+		User:           *user,
+		MachineKey:     key.NewMachine().Public(),
+		NodeKey:        sharedNodeKey.Public(),
+		DiscoKey:       key.NewDisco().Public(),
+		Hostname:       "attacker",
+		RegisterMethod: util.RegisterMethodCLI,
+	})
+	require.Error(t, err,
+		"registering a NodeKey already bound to another machine must be rejected")
+}
+
+// TestReauthRejectsNodeKeyClaimedByAnotherMachine proves the re-auth/update
+// path enforces the same 1:1 NodeKey<->MachineKey binding as the create path
+// (TestRegistrationRejectsNodeKeyClaimedByAnotherMachine) and the poll path
+// (getAndValidateNode). Without it, a node re-authenticating could rotate its
+// NodeKey to a victim's, poisoning the NodeStore NodeKey index so the victim's
+// MapRequest resolves to the attacker's node and is rejected — a DoS.
+func TestReauthRejectsNodeKeyClaimedByAnotherMachine(t *testing.T) {
+	dbPath := t.TempDir() + "/headscale.db"
+	cfg := persistTestConfig(dbPath)
+
+	database, err := db.NewHeadscaleDatabase(cfg)
+	require.NoError(t, err)
+
+	attacker := database.CreateUserForTest("attacker")
+	victim := database.CreateUserForTest("victim")
+	require.NoError(t, database.Close())
+
+	s, err := NewState(cfg)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = s.Close() })
+
+	victimNodeKey := key.NewNode()
+	attackerMachine := key.NewMachine()
+
+	// Victim's node holds victimNodeKey.
+	_, err = s.createAndSaveNewNode(newNodeParams{
+		User:           *victim,
+		MachineKey:     key.NewMachine().Public(),
+		NodeKey:        victimNodeKey.Public(),
+		DiscoKey:       key.NewDisco().Public(),
+		Hostname:       "victim",
+		RegisterMethod: util.RegisterMethodCLI,
+	})
+	require.NoError(t, err)
+
+	// Attacker registers its own node.
+	attackerNode, err := s.createAndSaveNewNode(newNodeParams{
+		User:           *attacker,
+		MachineKey:     attackerMachine.Public(),
+		NodeKey:        key.NewNode().Public(),
+		DiscoKey:       key.NewDisco().Public(),
+		Hostname:       "attacker",
+		RegisterMethod: util.RegisterMethodCLI,
+	})
+	require.NoError(t, err)
+
+	// Attacker re-authenticates its own node but supplies the victim's NodeKey.
+	_, err = s.applyAuthNodeUpdate(authNodeUpdateParams{
+		ExistingNode: attackerNode,
+		RegData: &types.RegistrationData{
+			MachineKey: attackerMachine.Public(),
+			NodeKey:    victimNodeKey.Public(),
+			Hostname:   "attacker",
+			Hostinfo:   &tailcfg.Hostinfo{},
+		},
+		ValidHostinfo:  &tailcfg.Hostinfo{},
+		Hostname:       "attacker",
+		User:           attacker,
+		RegisterMethod: util.RegisterMethodCLI,
+	})
+	require.Error(t, err,
+		"re-auth claiming a NodeKey bound to another machine must be rejected")
+}
+
+// TestReauthPreservesEndpointsWhenClientOmitsThem proves the re-auth/update
+// path keeps a node's live WireGuard endpoints when the originating
+// RegisterRequest carried none. Web/OIDC relogins report endpoints via
+// MapRequest, not register, so RegData.Endpoints is empty; wiping the stored
+// endpoints would advertise the re-keyed node to peers endpoint-less, which
+// drives head/unstable tailscale clients into one-way disco-deafness.
+func TestReauthPreservesEndpointsWhenClientOmitsThem(t *testing.T) {
+	dbPath := t.TempDir() + "/headscale.db"
+	cfg := persistTestConfig(dbPath)
+
+	database, err := db.NewHeadscaleDatabase(cfg)
+	require.NoError(t, err)
+
+	user := database.CreateUserForTest("user")
+	require.NoError(t, database.Close())
+
+	s, err := NewState(cfg)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = s.Close() })
+
+	machine := key.NewMachine()
+	endpoints := []netip.AddrPort{
+		netip.MustParseAddrPort("192.168.1.5:41641"),
+		netip.MustParseAddrPort("10.0.0.5:41641"),
+	}
+
+	// Node is registered and has reported live endpoints (as after its first
+	// MapRequest).
+	node, err := s.createAndSaveNewNode(newNodeParams{
+		User:           *user,
+		MachineKey:     machine.Public(),
+		NodeKey:        key.NewNode().Public(),
+		DiscoKey:       key.NewDisco().Public(),
+		Hostname:       "node",
+		Endpoints:      endpoints,
+		RegisterMethod: util.RegisterMethodCLI,
+	})
+	require.NoError(t, err)
+	require.Equal(t, endpoints, node.Endpoints().AsSlice(),
+		"precondition: node has live endpoints")
+
+	// Node re-authenticates, rotating its NodeKey. The RegisterRequest carries
+	// no endpoints.
+	updated, err := s.applyAuthNodeUpdate(authNodeUpdateParams{
+		ExistingNode: node,
+		RegData: &types.RegistrationData{
+			MachineKey: machine.Public(),
+			NodeKey:    key.NewNode().Public(),
+			Hostname:   "node",
+			Hostinfo:   &tailcfg.Hostinfo{},
+			Endpoints:  nil,
+		},
+		ValidHostinfo:  &tailcfg.Hostinfo{},
+		Hostname:       "node",
+		User:           user,
+		RegisterMethod: util.RegisterMethodCLI,
+	})
+	require.NoError(t, err)
+
+	assert.Equal(t, endpoints, updated.Endpoints().AsSlice(),
+		"re-auth without reported endpoints must preserve the node's live endpoints")
+}
+
+// TestReauthChange covers the decision both re-auth paths share: a same-user
+// relogin must be an incremental peer patch (so the tailscale client takes its
+// fast patch path), never a whole-node add (which strands a re-keyed,
+// momentarily-endpoint-less peer disco-deaf); a policy change forces a full
+// recompute; a new node is a whole-node add.
+func TestReauthChange(t *testing.T) {
+	n := types.Node{
+		ID:       7,
+		NodeKey:  key.NewNode().Public(),
+		DiscoKey: key.NewDisco().Public(),
+	}
+	node := n.View()
+
+	relogin := reauthChange(node, true, false)
+	assert.Len(t, relogin.PeerPatches, 1, "relogin must be a peer patch")
+	assert.Empty(t, relogin.PeersChanged, "relogin must not be a whole-node add")
+
+	added := reauthChange(node, false, false)
+	assert.Empty(t, added.PeerPatches)
+	assert.Len(t, added.PeersChanged, 1, "a new node must be a whole-node add")
+
+	pol := reauthChange(node, true, true)
+	assert.Empty(t, pol.PeerPatches, "a policy change must not be a peer patch")
+	assert.Empty(t, pol.PeersChanged)
+	assert.False(t, pol.IsEmpty(), "a policy change must be non-empty")
+}
+
+// TestPreAuthKeyReauthRejectsNodeKeyClaimedByAnotherMachine is the pre-auth-key
+// analogue of TestReauthRejectsNodeKeyClaimedByAnotherMachine: re-registering
+// via a pre-auth key must enforce the same 1:1 NodeKey<->MachineKey binding the
+// auth path and poll-time validation enforce, so a node cannot rotate its key
+// to a victim's and poison the NodeStore NodeKey index.
+func TestPreAuthKeyReauthRejectsNodeKeyClaimedByAnotherMachine(t *testing.T) {
+	dbPath := t.TempDir() + "/headscale.db"
+	cfg := persistTestConfig(dbPath)
+
+	s, err := NewState(cfg)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = s.Close() })
+
+	attacker := s.CreateUserForTest("attacker")
+	victim := s.CreateUserForTest("victim")
+
+	victimMachine := key.NewMachine()
+	victimNodeKey := key.NewNode()
+	_, err = s.createAndSaveNewNode(newNodeParams{
+		User:           *victim,
+		MachineKey:     victimMachine.Public(),
+		NodeKey:        victimNodeKey.Public(),
+		DiscoKey:       key.NewDisco().Public(),
+		Hostname:       "victim",
+		RegisterMethod: util.RegisterMethodCLI,
+	})
+	require.NoError(t, err)
+
+	// Attacker registers its own node with a reusable pre-auth key.
+	pak, err := s.CreatePreAuthKey(attacker.TypedID(), true, false, nil, nil)
+	require.NoError(t, err)
+
+	attackerMachine := key.NewMachine()
+	regReq := tailcfg.RegisterRequest{
+		Auth:     &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey:  key.NewNode().Public(),
+		Hostinfo: &tailcfg.Hostinfo{Hostname: "attacker"},
+		Expiry:   time.Now().Add(24 * time.Hour),
+	}
+	_, _, err = s.HandleNodeFromPreAuthKey(regReq, attackerMachine.Public())
+	require.NoError(t, err)
+
+	// Attacker re-registers its own node but supplies the victim's NodeKey.
+	attack := regReq
+	attack.NodeKey = victimNodeKey.Public()
+	_, _, err = s.HandleNodeFromPreAuthKey(attack, attackerMachine.Public())
+	require.ErrorIs(t, err, ErrNodeKeyInUse,
+		"pre-auth-key re-registration claiming another machine's NodeKey must be rejected")
+
+	// The victim still owns its NodeKey.
+	owner, ok := s.GetNodeByNodeKey(victimNodeKey.Public())
+	require.True(t, ok)
+	require.Equal(t, victimMachine.Public(), owner.MachineKey(),
+		"victim's NodeKey index entry must be untouched")
+}
+
+var errInjectedNodeUpdate = errors.New("injected node update failure")
+
+// TestPreAuthKeyReauthRevertsNodeStoreOnDBFailure ensures a failed database
+// write during pre-auth-key re-registration does not leave the NodeStore
+// holding a node key that was never persisted: a restart would reload the old
+// row and the client's current key would no longer resolve, locking it out.
+func TestPreAuthKeyReauthRevertsNodeStoreOnDBFailure(t *testing.T) {
+	dbPath := t.TempDir() + "/headscale.db"
+	cfg := persistTestConfig(dbPath)
+
+	s, err := NewState(cfg)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = s.Close() })
+
+	user := s.CreateUserForTest("reauth-user")
+
+	pak, err := s.CreatePreAuthKey(user.TypedID(), true, false, nil, nil)
+	require.NoError(t, err)
+
+	machineKey := key.NewMachine()
+	regReq := tailcfg.RegisterRequest{
+		Auth:     &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+		NodeKey:  key.NewNode().Public(),
+		Hostinfo: &tailcfg.Hostinfo{Hostname: "reauth-node"},
+		Expiry:   time.Now().Add(24 * time.Hour),
+	}
+	node, _, err := s.HandleNodeFromPreAuthKey(regReq, machineKey.Public())
+	require.NoError(t, err)
+
+	origNodeKey := node.NodeKey()
+
+	// Fail the node row update so the re-registration's database write errors
+	// after the NodeStore has already been mutated.
+	require.NoError(t, s.db.DB.Callback().Update().Before("gorm:update").
+		Register("fail_node_update", func(tx *gorm.DB) {
+			if tx.Statement.Table == "nodes" {
+				_ = tx.AddError(errInjectedNodeUpdate)
+			}
+		}))
+
+	reReg := regReq
+	reReg.NodeKey = key.NewNode().Public() // rotate -> NodeStore mutation, then DB write fails
+	_, _, err = s.HandleNodeFromPreAuthKey(reReg, machineKey.Public())
+	require.NoError(t, s.db.DB.Callback().Update().Remove("fail_node_update"))
+	require.Error(t, err, "re-registration must fail when the database write fails")
+
+	got, ok := s.nodeStore.GetNode(node.ID())
+	require.True(t, ok)
+	require.Equal(t, origNodeKey, got.NodeKey(),
+		"NodeStore must revert to the persisted node key when the write fails")
+}
+
+// TestConcurrentPreAuthKeyRegistrationSameMachineKey ensures concurrent
+// registrations of the same machine key resolve to a single node. Without
+// serialising the find-then-create section, each request sees "no existing
+// node" and creates its own, leaving duplicate nodes and IP allocations for
+// one machine.
+func TestConcurrentPreAuthKeyRegistrationSameMachineKey(t *testing.T) {
+	dbPath := t.TempDir() + "/headscale.db"
+	cfg := persistTestConfig(dbPath)
+
+	s, err := NewState(cfg)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = s.Close() })
+
+	user := s.CreateUserForTest("concurrent-user")
+
+	pak, err := s.CreatePreAuthKey(user.TypedID(), true, false, nil, nil)
+	require.NoError(t, err)
+
+	machineKey := key.NewMachine()
+
+	const n = 12
+
+	var wg sync.WaitGroup
+
+	start := make(chan struct{})
+	errs := make(chan error, n)
+
+	for range n {
+		wg.Go(func() {
+			regReq := tailcfg.RegisterRequest{
+				Auth:     &tailcfg.RegisterResponseAuth{AuthKey: pak.Key},
+				NodeKey:  key.NewNode().Public(),
+				Hostinfo: &tailcfg.Hostinfo{Hostname: "concurrent-node"},
+				Expiry:   time.Now().Add(24 * time.Hour),
+			}
+
+			<-start
+
+			_, _, err := s.HandleNodeFromPreAuthKey(regReq, machineKey.Public())
+			errs <- err
+		})
+	}
+
+	close(start)
+	wg.Wait()
+	close(errs)
+
+	for err := range errs {
+		require.NoError(t, err)
+	}
+
+	require.Equal(t, 1, s.ListNodes().Len(),
+		"concurrent registrations of one machine key must yield a single node")
+}
@@ -0,0 +1,40 @@
+package state
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/juanfont/headscale/hscontrol/db"
+	"github.com/stretchr/testify/require"
+)
+
+// TestRenameNodeRejectsNameExceedingFQDNLimit proves RenameNode rejects a name
+// that is a valid DNS label but whose FQDN, under the configured base_domain,
+// exceeds MaxHostnameLength. Without the FQDN-length gate such a name persists
+// and then breaks map generation for the node and its peers (issue #3346):
+// admin-facing writes must not be able to introduce an unmappable name.
+func TestRenameNodeRejectsNameExceedingFQDNLimit(t *testing.T) {
+	dbPath := t.TempDir() + "/headscale.db"
+	cfg := persistTestConfig(dbPath)
+	// A long base domain so a 63-char label overflows the 255-char FQDN bound.
+	cfg.BaseDomain = strings.Repeat("b", 200) + ".example.com"
+
+	database, err := db.NewHeadscaleDatabase(cfg)
+	require.NoError(t, err)
+
+	user := database.CreateUserForTest("rename-user")
+	node := database.CreateRegisteredNodeForTest(user, "rename-node")
+	require.NoError(t, database.Close())
+
+	s, err := NewState(cfg)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = s.Close() })
+
+	// Valid 63-char DNS label, but the resulting FQDN exceeds 255 chars.
+	_, _, err = s.RenameNode(node.ID, strings.Repeat("a", 63))
+	require.Error(t, err, "rename to a name whose FQDN exceeds the limit must be rejected")
+
+	// A short, valid name is still accepted.
+	_, _, err = s.RenameNode(node.ID, "short")
+	require.NoError(t, err)
+}
@@ -250,6 +250,41 @@ func FilterForNode(nodeID types.NodeID, rs []Change) []Change {
 	return result
 }

+// IsBroadcastPolicyChange reports whether r is a tailnet-wide policy recompute
+// with no per-node payload. A recompute reads the current snapshot, so every
+// such change is interchangeable and same-tick duplicates are redundant. A
+// targeted or self-update ([Change.OriginNode]) recompute is per-node, so it is
+// not one of these.
+func (r Change) IsBroadcastPolicyChange() bool {
+	return r.RequiresRuntimePeerComputation && !r.IsTargetedToNode() && r.OriginNode == 0
+}
+
+// DedupePolicyChanges keeps the first broadcast policy change in a tick and
+// drops the rest: each rebuilds a node's whole netmap from the same snapshot, so
+// the repeats are wasted work. Order and all other changes are preserved.
+func DedupePolicyChanges(changes []Change) []Change {
+	if len(changes) < 2 {
+		return changes
+	}
+
+	out := make([]Change, 0, len(changes))
+	seen := false
+
+	for _, r := range changes {
+		if r.IsBroadcastPolicyChange() {
+			if seen {
+				continue
+			}
+
+			seen = true
+		}
+
+		out = append(out, r)
+	}
+
+	return out
+}
+
 func uniqueNodeIDs(ids []types.NodeID) []types.NodeID {
 	if len(ids) == 0 {
 		return nil
@@ -421,29 +456,19 @@ func NodeRemoved(id types.NodeID) Change {
 	return PeersRemoved(id)
 }

-// NodeOnlineFor returns a [Change] for when a node comes online.
-// If the node is a subnet router, a full update is sent instead of a patch.
+// NodeOnlineFor returns the [Change] for a node coming online: a lightweight
+// [NodeOnline] peer patch. Subnet routers, relay targets, and via targets get
+// their full peer recompute from the gated [PolicyChange] that State.Connect
+// emits, so no full update is needed here.
 func NodeOnlineFor(node types.NodeView) Change {
-	if node.IsSubnetRouter() {
-		c := FullUpdate()
-		c.Reason = "subnet router online"
-
-		return c
-	}
-
 	return NodeOnline(node.ID())
 }

-// NodeOfflineFor returns a [Change] for when a node goes offline.
-// If the node is a subnet router, a full update is sent instead of a patch.
+// NodeOfflineFor returns the [Change] for a node going offline: a lightweight
+// [NodeOffline] peer patch. As with [NodeOnlineFor], subnet routers and other
+// recompute-forcing nodes rely on the gated [PolicyChange] from State.Disconnect
+// for the peer recompute, so no full update is needed here.
 func NodeOfflineFor(node types.NodeView) Change {
-	if node.IsSubnetRouter() {
-		c := FullUpdate()
-		c.Reason = "subnet router offline"
-
-		return c
-	}
-
 	return NodeOffline(node.ID())
 }

@@ -465,6 +490,35 @@ func EndpointOrDERPUpdate(id types.NodeID, patch *tailcfg.PeerChange) Change {
 	return c
 }

+// NodeKeyRotated returns a [Change] for a node re-logging in: its NodeKey (and
+// possibly DiscoKey, key expiry, or endpoints) changed, but nothing structural
+// did. Peers only need those changed fields, so it is sent as the minimal
+// incremental [tailcfg.PeerChange] patch rather than re-advertising the whole
+// node — the smallest update that conveys the rotation, and the least
+// disruptive for peers reconciling it.
+func NodeKeyRotated(node types.NodeView) Change {
+	nk := node.NodeKey()
+	dk := node.DiscoKey()
+
+	// KeyExpiry is always set: the zero value clears any prior expiry on the
+	// peer (un-expire), and a non-zero value carries the new expiry.
+	var expiry time.Time
+	if e, ok := node.Expiry().GetOk(); ok {
+		expiry = e
+	}
+
+	c := PeerPatched("node key rotated (relogin)", &tailcfg.PeerChange{
+		NodeID:    tailcfg.NodeID(node.ID()), //nolint:gosec // NodeID is bounded
+		Key:       &nk,
+		DiscoKey:  &dk,
+		KeyExpiry: &expiry,
+		Endpoints: node.Endpoints().AsSlice(),
+	})
+	c.OriginNode = node.ID()
+
+	return c
+}
+
 // UserAdded returns a [Change] for when a user is added or updated.
 // A full update is sent to refresh user profiles on all nodes.
 func UserAdded() Change {
@@ -1,12 +1,16 @@
 package change

 import (
+	"net/netip"
 	"reflect"
 	"testing"
+	"time"

 	"github.com/juanfont/headscale/hscontrol/types"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 	"tailscale.com/tailcfg"
+	"tailscale.com/types/key"
 )

 func TestChange_FieldSync(t *testing.T) {
@@ -296,6 +300,99 @@ func TestChange_Merge(t *testing.T) {
 	}
 }

+func TestChange_IsBroadcastPolicyChange(t *testing.T) {
+	originUpdate := PolicyChange()
+	originUpdate.OriginNode = 7
+
+	targeted := PolicyChange()
+	targeted.TargetNode = 7
+
+	tests := []struct {
+		name string
+		c    Change
+		want bool
+	}{
+		{name: "policy change", c: PolicyChange(), want: true},
+		{name: "self-update recompute", c: originUpdate, want: false},
+		{name: "targeted recompute", c: targeted, want: false},
+		{name: "online patch", c: NodeOnline(1), want: false},
+		{name: "full update", c: FullUpdate(), want: false},
+		{name: "derp map", c: DERPMap(), want: false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			assert.Equal(t, tt.want, tt.c.IsBroadcastPolicyChange())
+		})
+	}
+}
+
+func TestDedupePolicyChanges(t *testing.T) {
+	// originRecompute is a runtime recompute carrying node-specific payload
+	// (OriginNode), so it is not the canonical broadcast PolicyChange and must
+	// never be coalesced away.
+	originRecompute := PolicyChange()
+	originRecompute.OriginNode = 7
+
+	tests := []struct {
+		name    string
+		changes []Change
+		want    []Change
+	}{
+		{
+			name:    "nil is a no-op",
+			changes: nil,
+			want:    nil,
+		},
+		{
+			name:    "single policy change is unchanged",
+			changes: []Change{PolicyChange()},
+			want:    []Change{PolicyChange()},
+		},
+		{
+			name:    "identical policy changes collapse to one",
+			changes: []Change{PolicyChange(), PolicyChange(), PolicyChange()},
+			want:    []Change{PolicyChange()},
+		},
+		{
+			name: "peer patches survive between collapsed policy changes",
+			changes: []Change{
+				NodeOnline(1), PolicyChange(), NodeOnline(2), PolicyChange(), NodeOffline(3),
+			},
+			want: []Change{
+				NodeOnline(1), PolicyChange(), NodeOnline(2), NodeOffline(3),
+			},
+		},
+		{
+			name:    "NodeAdded is preserved, not treated as a recompute",
+			changes: []Change{PolicyChange(), NodeAdded(5), PolicyChange()},
+			want:    []Change{PolicyChange(), NodeAdded(5)},
+		},
+		{
+			name:    "recompute carrying OriginNode is kept alongside the canonical one",
+			changes: []Change{PolicyChange(), originRecompute, PolicyChange()},
+			want:    []Change{PolicyChange(), originRecompute},
+		},
+		{
+			name:    "non-canonical recomputes are not collapsed",
+			changes: []Change{originRecompute, originRecompute},
+			want:    []Change{originRecompute, originRecompute},
+		},
+		{
+			name:    "changes without any recompute are unchanged",
+			changes: []Change{NodeOnline(1), DERPMap()},
+			want:    []Change{NodeOnline(1), DERPMap()},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := DedupePolicyChanges(tt.changes)
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}
+
 func TestChange_Constructors(t *testing.T) {
 	tests := []struct {
 		name        string
@@ -519,3 +616,73 @@ func TestUniqueNodeIDs(t *testing.T) {
 		})
 	}
 }
+
+func TestNodeOnlineOfflineForSubnetRouter(t *testing.T) {
+	route := netip.MustParsePrefix("10.0.0.0/24")
+	router := types.Node{
+		ID:             1,
+		Hostinfo:       &tailcfg.Hostinfo{RoutableIPs: []netip.Prefix{route}},
+		ApprovedRoutes: []netip.Prefix{route},
+	}
+	view := router.View()
+	require.True(t, view.IsSubnetRouter(), "test node must be a subnet router")
+
+	tests := []struct {
+		name       string
+		got        Change
+		wantOnline bool
+	}{
+		{name: "online", got: NodeOnlineFor(view), wantOnline: true},
+		{name: "offline", got: NodeOfflineFor(view), wantOnline: false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// A subnet router's online/offline transition rides the lightweight
+			// peer patch, not a full update: the gated PolicyChange that
+			// State.Connect/Disconnect emit owns the netmap recompute.
+			assert.False(t, tt.got.IsFull(),
+				"subnet router online/offline must be a peer patch, not a full update")
+
+			require.NotEmpty(t, tt.got.PeerPatches,
+				"expected an online/offline peer patch")
+
+			patch := tt.got.PeerPatches[0]
+			assert.Equal(t, view.ID().NodeID(), patch.NodeID)
+
+			require.NotNil(t, patch.Online)
+			assert.Equal(t, tt.wantOnline, *patch.Online)
+		})
+	}
+}
+
+// TestNodeKeyRotatedEmitsPatchNotWholeNode proves a relogin is delivered to
+// peers as an incremental peer patch, not a whole-node add. A whole-node add is
+// non-patchifiable on the tailscale client whenever Hostinfo changed (which it
+// does on relogin), forcing the broken NodeMutationAdd path that strands a
+// re-keyed, momentarily-endpoint-less peer.
+func TestNodeKeyRotatedEmitsPatchNotWholeNode(t *testing.T) {
+	expiry := time.Now().Add(24 * time.Hour).UTC()
+	node := types.Node{
+		ID:        7,
+		NodeKey:   key.NewNode().Public(),
+		DiscoKey:  key.NewDisco().Public(),
+		Endpoints: []netip.AddrPort{netip.MustParseAddrPort("192.168.1.9:41641")},
+		Expiry:    &expiry,
+	}
+	view := node.View()
+
+	c := NodeKeyRotated(view)
+
+	assert.False(t, c.IsFull(), "relogin must be a peer patch, not a full update")
+	assert.Empty(t, c.PeersChanged, "relogin must not emit a whole-node PeersChanged")
+	require.Len(t, c.PeerPatches, 1, "relogin must emit exactly one peer patch")
+
+	patch := c.PeerPatches[0]
+	assert.Equal(t, view.ID().NodeID(), patch.NodeID)
+	require.NotNil(t, patch.Key, "patch must carry the rotated NodeKey")
+	assert.Equal(t, node.NodeKey, *patch.Key)
+	require.NotNil(t, patch.KeyExpiry, "patch must carry KeyExpiry to (un)expire the peer")
+	assert.Equal(t, expiry, *patch.KeyExpiry)
+	assert.Equal(t, []netip.AddrPort(node.Endpoints), patch.Endpoints, "patch must carry endpoints")
+}
@@ -8,6 +8,7 @@ import (
 	"net/url"
 	"os"
 	"strings"
+	"sync"
 	"time"

 	"github.com/coreos/go-oidc/v3/oidc"
@@ -711,8 +712,8 @@ func derpConfig() DERPConfig {

 	urlStrs := viper.GetStringSlice("derp.urls")

-	urls := make([]url.URL, len(urlStrs))
-	for index, urlStr := range urlStrs {
+	urls := make([]url.URL, 0, len(urlStrs))
+	for _, urlStr := range urlStrs {
 		urlAddr, err := url.Parse(urlStr)
 		if err != nil {
 			log.Error().
@@ -720,9 +721,11 @@ func derpConfig() DERPConfig {
 				Str("url", urlStr).
 				Err(err).
 				Msg("Failed to parse url, ignoring...")
+
+			continue
 		}

-		urls[index] = *urlAddr
+		urls = append(urls, *urlAddr)
 	}

 	paths := viper.GetStringSlice("derp.paths")
@@ -1482,3 +1485,33 @@ func (d *deprecator) Log() {
 		log.Warn().Msg("\n" + d.String())
 	}
 }
+
+// tailcfgDNSMu guards concurrent access to the mutable ExtraRecords of
+// [Config.TailcfgDNSConfig] between the extra-records file watcher (writer)
+// and the per-client map builds that clone it (readers). It is a package-level
+// lock so [Config] stays freely copyable during construction.
+var tailcfgDNSMu sync.RWMutex
+
+// CloneTailcfgDNSConfig returns a deep copy of [Config.TailcfgDNSConfig], or
+// nil if none is set. Safe for concurrent use with [Config.SetExtraRecords].
+func (c *Config) CloneTailcfgDNSConfig() *tailcfg.DNSConfig {
+	tailcfgDNSMu.RLock()
+	defer tailcfgDNSMu.RUnlock()
+
+	if c.TailcfgDNSConfig == nil {
+		return nil
+	}
+
+	return c.TailcfgDNSConfig.Clone()
+}
+
+// SetExtraRecords replaces the ExtraRecords of [Config.TailcfgDNSConfig]. Safe
+// for concurrent use with [Config.CloneTailcfgDNSConfig].
+func (c *Config) SetExtraRecords(records []tailcfg.DNSRecord) {
+	tailcfgDNSMu.Lock()
+	defer tailcfgDNSMu.Unlock()
+
+	if c.TailcfgDNSConfig != nil {
+		c.TailcfgDNSConfig.ExtraRecords = records
+	}
+}
@@ -0,0 +1,28 @@
+package types
+
+import (
+	"testing"
+
+	"github.com/spf13/viper"
+)
+
+// TestDerpConfigSkipsMalformedURL ensures a malformed derp.urls entry is
+// skipped (as the "ignoring..." log promises) rather than dereferencing the
+// nil *url.URL that url.Parse returns on error, which crashed the server at
+// startup.
+func TestDerpConfigSkipsMalformedURL(t *testing.T) {
+	viper.Reset()
+	defer viper.Reset()
+
+	viper.Set("derp.urls", []string{
+		"https://controlplane.tailscale.com/derpmap/default",
+		"://bad",
+	})
+
+	cfg := derpConfig()
+
+	if len(cfg.URLs) != 1 {
+		t.Fatalf("expected the malformed derp.urls entry to be skipped, got %d urls: %v",
+			len(cfg.URLs), cfg.URLs)
+	}
+}
@@ -21,6 +21,7 @@ import (
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/key"
 	"tailscale.com/types/views"
+	"tailscale.com/util/dnsname"
 )

 var (
@@ -181,10 +182,21 @@ type Node struct {
 	// online. Written by the HA prober. Runtime-only.
 	Unhealthy bool `gorm:"-"`

-	// SessionEpoch identifies a poll session. Connect bumps it; a
-	// Disconnect carrying a stale value is dropped, so a deferred
-	// disconnect from a previous session cannot overwrite a newer
-	// Connect. Runtime-only.
+	// ActiveSessions counts live poll sessions for this node.
+	// [State.Connect] increments it and every session release
+	// ([State.Disconnect]) decrements it, so the node goes offline
+	// exactly when its last session ends — regardless of the order in
+	// which overlapping sessions' cleanups run. Never persisted, like
+	// SessionEpoch.
+	ActiveSessions int `gorm:"-"`
+
+	// SessionEpoch identifies a poll session generation; Connect bumps
+	// it. It complements ActiveSessions rather than duplicating it:
+	// the epoch is monotonic, which the HA prober needs to detect that
+	// a probe target reconnected mid-cycle — a refcount can return to
+	// its old value, a generation cannot. poll.go also uses the epoch
+	// returned by Connect as a "Connect ran" sentinel for its cleanup,
+	// and Disconnect logs it. Runtime-only.
 	SessionEpoch uint64 `gorm:"-"`
 }

@@ -363,11 +375,21 @@ func (node *Node) AppendToIPSet(build *netipx.IPSetBuilder) {
 // matching node2's IPs, node2's approved subnet routes, or "the
 // internet" when node2 is an exit node — grants access.
 func (node *Node) CanAccess(matchers []matcher.Match, node2 *Node) bool {
+	return node.canAccess(matchers, node2, node.SubnetRoutes(), node2.SubnetRoutes(), node2.IsExitNode())
+}
+
+// canAccess is [Node.CanAccess] with the snapshot-stable route data supplied by
+// the caller. The peer-map build precomputes each node's SubnetRoutes and
+// exit-node status once and passes them here, so the O(n^2) pair scan does not
+// recompute them for every pair.
+func (node *Node) canAccess(
+	matchers []matcher.Match,
+	node2 *Node,
+	srcRoutes, dstRoutes []netip.Prefix,
+	dstIsExit bool,
+) bool {
 	src := node.IPs()
 	allowedIPs := node2.IPs()
-	srcRoutes := node.SubnetRoutes()
-	dstRoutes := node2.SubnetRoutes()
-	dstIsExit := node2.IsExitNode()

 	for _, m := range matchers {
 		srcMatchesIP := m.SrcsContainsIPs(src...)
@@ -547,6 +569,28 @@ func (node *Node) GetFQDN(baseDomain string) (string, error) {
 	return hostname, nil
 }

+// ValidateGivenName reports whether givenName is usable as a node's DNS label:
+// a valid DNS label that, combined with baseDomain, yields an FQDN within
+// MaxHostnameLength. Admin-facing write paths (e.g. node rename) reject names
+// that fail this, since the mapper cannot build a map for a node — or any of
+// its peers — whose GetFQDN fails. Derived paths sanitise/coerce instead.
+func ValidateGivenName(givenName, baseDomain string) error {
+	err := dnsname.ValidLabel(givenName)
+	if err != nil {
+		return fmt.Errorf("%q is not a valid DNS label: %w", givenName, err)
+	}
+
+	// Reuse GetFQDN so the length bound stays identical to what the mapper
+	// enforces; a valid 63-char label can still overflow under a long
+	// base_domain.
+	_, err = (&Node{GivenName: givenName}).GetFQDN(baseDomain)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
 // AnnouncedRoutes returns the list of routes the node announces, as
 // reported by the client in [tailcfg.Hostinfo.RoutableIPs]. Announcement alone
 // does not grant visibility — see [Node.SubnetRoutes] for approval-gated
@@ -735,19 +779,21 @@ func (node *Node) ApplyPeerChange(change *tailcfg.PeerChange) {
 	// This might technically not be useful as we replace
 	// the whole hostinfo blob when it has changed.
 	if change.DERPRegion != 0 {
-		if node.Hostinfo == nil {
-			node.Hostinfo = &tailcfg.Hostinfo{
-				NetInfo: &tailcfg.NetInfo{
-					PreferredDERP: change.DERPRegion,
-				},
-			}
-		} else if node.Hostinfo.NetInfo == nil {
-			node.Hostinfo.NetInfo = &tailcfg.NetInfo{
-				PreferredDERP: change.DERPRegion,
-			}
-		} else {
-			node.Hostinfo.NetInfo.PreferredDERP = change.DERPRegion
+		// [NodeStore] publishes snapshots that share the *Hostinfo /
+		// *NetInfo pointers, so writing PreferredDERP in place would race
+		// readers of an already-published snapshot. Clone to fresh pointers
+		// and assign, leaving the previous snapshot untouched.
+		hi := node.Hostinfo.Clone()
+		if hi == nil {
+			hi = &tailcfg.Hostinfo{}
 		}
+
+		if hi.NetInfo == nil {
+			hi.NetInfo = &tailcfg.NetInfo{}
+		}
+
+		hi.NetInfo.PreferredDERP = change.DERPRegion
+		node.Hostinfo = hi
 	}

 	node.LastSeen = change.LastSeen
@@ -862,6 +908,21 @@ func (nv NodeView) CanAccess(matchers []matcher.Match, node2 NodeView) bool {
 	return nv.ж.CanAccess(matchers, node2.ж)
 }

+// CanAccessWithRoutes is [NodeView.CanAccess] with precomputed route data, used
+// by the peer-map build to avoid recomputing each node's routes per pair.
+func (nv NodeView) CanAccessWithRoutes(
+	matchers []matcher.Match,
+	node2 NodeView,
+	srcRoutes, dstRoutes []netip.Prefix,
+	dstIsExit bool,
+) bool {
+	if !nv.Valid() || !node2.Valid() {
+		return false
+	}
+
+	return nv.ж.canAccess(matchers, node2.ж, srcRoutes, dstRoutes, dstIsExit)
+}
+
 func (nv NodeView) CanAccessRoute(matchers []matcher.Match, route netip.Prefix) bool {
 	if !nv.Valid() {
 		return false
@@ -0,0 +1,61 @@
+package types
+
+import (
+	"testing"
+
+	"tailscale.com/tailcfg"
+)
+
+// TestApplyPeerChangeDERPDoesNotMutateSharedHostinfo guards the NodeStore
+// copy-on-write invariant: published snapshots share the *tailcfg.Hostinfo /
+// *tailcfg.NetInfo pointers, so ApplyPeerChange must never write a DERP region
+// through them in place. It must produce fresh pointers, leaving any
+// previously-shared Hostinfo untouched.
+func TestApplyPeerChangeDERPDoesNotMutateSharedHostinfo(t *testing.T) {
+	const newRegion = 2
+
+	t.Run("existing NetInfo", func(t *testing.T) {
+		shared := &tailcfg.Hostinfo{
+			Hostname: "n",
+			NetInfo:  &tailcfg.NetInfo{PreferredDERP: 1},
+		}
+		node := &Node{Hostinfo: shared}
+
+		node.ApplyPeerChange(&tailcfg.PeerChange{DERPRegion: newRegion})
+
+		if got := node.Hostinfo.NetInfo.PreferredDERP; got != newRegion {
+			t.Fatalf("node PreferredDERP = %d, want %d", got, newRegion)
+		}
+
+		if got := shared.NetInfo.PreferredDERP; got != 1 {
+			t.Errorf("shared NetInfo mutated in place: PreferredDERP = %d, want 1", got)
+		}
+
+		if node.Hostinfo == shared {
+			t.Error("node.Hostinfo still aliases the shared Hostinfo pointer")
+		}
+
+		if node.Hostinfo.NetInfo == shared.NetInfo {
+			t.Error("node.Hostinfo.NetInfo still aliases the shared NetInfo pointer")
+		}
+	})
+
+	t.Run("nil NetInfo", func(t *testing.T) {
+		shared := &tailcfg.Hostinfo{Hostname: "n"}
+		node := &Node{Hostinfo: shared}
+
+		node.ApplyPeerChange(&tailcfg.PeerChange{DERPRegion: newRegion})
+
+		if got := node.Hostinfo.NetInfo.PreferredDERP; got != newRegion {
+			t.Fatalf("node PreferredDERP = %d, want %d", got, newRegion)
+		}
+
+		if shared.NetInfo != nil {
+			t.Errorf("shared Hostinfo gained a NetInfo in place: %+v", shared.NetInfo)
+		}
+
+		if node.Hostinfo == shared {
+			t.Error("node.Hostinfo still aliases the shared Hostinfo pointer")
+		}
+	})
+}
@@ -418,6 +418,33 @@ func TestNodeFQDN(t *testing.T) {
 	}
 }

+func TestValidateGivenName(t *testing.T) {
+	tests := []struct {
+		name       string
+		givenName  string
+		baseDomain string
+		wantErr    bool
+	}{
+		{"valid", "test", "example.com", false},
+		{"empty", "", "example.com", true},
+		{"invalid label chars", "not valid", "example.com", true},
+		{"label too long", strings.Repeat("a", 64), "example.com", true},
+		// A valid 63-char label whose FQDN overflows only because the base
+		// domain is long: ValidLabel passes, the FQDN-length bound rejects it.
+		{"fqdn too long under long base domain", strings.Repeat("a", 63), strings.Repeat("b", 200) + ".example.com", true},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			err := ValidateGivenName(tc.givenName, tc.baseDomain)
+			if (err != nil) != tc.wantErr {
+				t.Errorf("ValidateGivenName(%q, %q) error = %v, wantErr %v",
+					tc.givenName, tc.baseDomain, err, tc.wantErr)
+			}
+		})
+	}
+}
+
 func TestPeerChangeFromMapRequest(t *testing.T) {
 	nKeys := []key.NodePublic{
 		key.NewNode().Public(),
@@ -106,6 +106,7 @@ var _NodeCloneNeedsRegeneration = Node(struct {
 	DeletedAt      *time.Time
 	IsOnline       *bool
 	Unhealthy      bool
+	ActiveSessions int
 	SessionEpoch   uint64
 }{})

@@ -262,10 +262,21 @@ func (v NodeView) IsOnline() views.ValuePointer[bool] { return views.ValuePointe
 // online. Written by the HA prober. Runtime-only.
 func (v NodeView) Unhealthy() bool { return v.ж.Unhealthy }

-// SessionEpoch identifies a poll session. Connect bumps it; a
-// Disconnect carrying a stale value is dropped, so a deferred
-// disconnect from a previous session cannot overwrite a newer
-// Connect. Runtime-only.
+// ActiveSessions counts live poll sessions for this node.
+// [State.Connect] increments it and every session release
+// ([State.Disconnect]) decrements it, so the node goes offline
+// exactly when its last session ends — regardless of the order in
+// which overlapping sessions' cleanups run. Never persisted, like
+// SessionEpoch.
+func (v NodeView) ActiveSessions() int { return v.ж.ActiveSessions }
+
+// SessionEpoch identifies a poll session generation; Connect bumps
+// it. It complements ActiveSessions rather than duplicating it:
+// the epoch is monotonic, which the HA prober needs to detect that
+// a probe target reconnected mid-cycle — a refcount can return to
+// its old value, a generation cannot. poll.go also uses the epoch
+// returned by Connect as a "Connect ran" sentinel for its cleanup,
+// and Disconnect logs it. Runtime-only.
 func (v NodeView) SessionEpoch() uint64 { return v.ж.SessionEpoch }
 func (v NodeView) String() string       { return v.ж.String() }

@@ -295,6 +306,7 @@ var _NodeViewNeedsRegeneration = Node(struct {
 	DeletedAt      *time.Time
 	IsOnline       *bool
 	Unhealthy      bool
+	ActiveSessions int
 	SessionEpoch   uint64
 }{})

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"net/netip"
+	"slices"
 	"strconv"
 	"strings"
 	"unicode"
@@ -103,6 +104,25 @@ func GenerateIPv4DNSRootDomain(ipPrefix netip.Prefix) []dnsname.FQDN {
 	// wildcardBits is the number of bits not under the mask in the lastOctet
 	wildcardBits := ByteSize - maskBits%ByteSize

+	// A mask covering the full address width (an IPv4 /32) leaves no wildcard
+	// octet, so lastOctet would index past the address. Emit the single
+	// reverse-DNS name for that exact address instead of panicking.
+	if lastOctet >= len(netRange.IP) {
+		rdnsSlice := make([]string, 0, len(netRange.IP)+1)
+		for _, v := range slices.Backward(netRange.IP) {
+			rdnsSlice = append(rdnsSlice, strconv.FormatUint(uint64(v), 10))
+		}
+
+		rdnsSlice = append(rdnsSlice, "in-addr.arpa.")
+
+		fqdn, err := dnsname.ToFQDN(strings.Join(rdnsSlice, "."))
+		if err != nil {
+			return nil
+		}
+
+		return []dnsname.FQDN{fqdn}
+	}
+
 	// minVal is the value in the lastOctet byte of the IP
 	// maxVal is basically 2^wildcardBits - i.e., the value when all the wildcardBits are set to 1
 	minVal := uint(netRange.IP[lastOctet])
@@ -0,0 +1,20 @@
+package util
+
+import (
+	"net/netip"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestGenerateIPv4DNSRootDomainSingleAddress ensures a single-address IPv4
+// prefix (/32) does not index past the 4-byte address and panic. A full-width
+// mask leaves no wildcard octet, so the function must emit the one reverse-DNS
+// name for that address.
+func TestGenerateIPv4DNSRootDomainSingleAddress(t *testing.T) {
+	require.NotPanics(t, func() {
+		fqdns := GenerateIPv4DNSRootDomain(netip.MustParsePrefix("100.64.0.1/32"))
+		assert.Len(t, fqdns, 1)
+	})
+}
@@ -32,9 +32,18 @@ func GenerateRandomBytes(n int) ([]byte, error) {
 func GenerateRandomStringURLSafe(n int) (string, error) {
 	b, err := GenerateRandomBytes(n)

-	uenc := base64.RawURLEncoding.EncodeToString(b)
+	return encodeRandomURLSafe(b, n, err)
+}

-	return uenc[:n], err
+// encodeRandomURLSafe URL-safe base64-encodes b and truncates to n. It checks
+// err first: on an RNG failure b is nil, so slicing the empty encoding would
+// panic instead of returning the ("", err) the caller is promised.
+func encodeRandomURLSafe(b []byte, n int, err error) (string, error) {
+	if err != nil {
+		return "", err
+	}
+
+	return base64.RawURLEncoding.EncodeToString(b)[:n], nil
 }

 // GenerateRandomStringDNSSafe returns a DNS-safe
@@ -0,0 +1,24 @@
+package util
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestEncodeRandomURLSafeChecksErrorFirst ensures the URL-safe random string
+// encoder returns ("", err) on an RNG failure instead of slicing the empty
+// base64 of nil bytes and panicking.
+func TestEncodeRandomURLSafeChecksErrorFirst(t *testing.T) {
+	require.NotPanics(t, func() {
+		s, err := encodeRandomURLSafe(nil, 32, assert.AnError)
+		assert.Empty(t, s)
+		require.Error(t, err)
+	})
+
+	s, err := encodeRandomURLSafe(bytes.Repeat([]byte{0x1}, 32), 32, nil)
+	require.NoError(t, err)
+	assert.Len(t, s, 32)
+}
--- a/Show More
+++ b/Show More