diff --git a/app/controllers/concerns/authentication.rb b/app/controllers/concerns/authentication.rb
index db23800..e609d33 100644
--- a/app/controllers/concerns/authentication.rb
+++ b/app/controllers/concerns/authentication.rb
@@ -71,6 +71,13 @@ module Authentication
       Current.session&.destroy!
       reset_session
       remove_authentication_cookie
+      disconnect_remote_connections
+    end
+
+    def disconnect_remote_connections
+      Current.user&.reset_remote_connections
+    rescue => error
+      Rails.logger.warn "Could not disconnect remote connections on sign out: #{error.class}"
     end
 
     def authenticated_as(session)
diff --git a/test/controllers/sessions_controller_test.rb b/test/controllers/sessions_controller_test.rb
index 92b860f..4b20dd9 100644
--- a/test/controllers/sessions_controller_test.rb
+++ b/test/controllers/sessions_controller_test.rb
@@ -56,6 +56,30 @@ class SessionsControllerTest < ActionDispatch::IntegrationTest
     assert_nil Session.find_by(id: session.id)
   end
 
+  test "destroy closes the signed-out user's live connections" do
+    sign_in :david
+
+    remote_connections = mock
+    remote_connections.expects(:disconnect).with(reconnect: true)
+    ActionCable.server.stubs(:remote_connections).returns(mock.tap { |m| m.expects(:where).with(current_user: users(:david)).returns(remote_connections) })
+
+    delete session_url
+
+    assert_redirected_to root_url
+  end
+
+  test "destroy still signs out when the realtime service is unreachable" do
+    sign_in :david
+    session = users(:david).sessions.last
+    ActionCable.server.stubs(:remote_connections).raises(RuntimeError.new("cable down"))
+
+    delete session_url
+
+    assert_redirected_to root_url
+    assert_not cookies[:session_token].present?
+    assert_nil Session.find_by(id: session.id)
+  end
+
   test "destroy removes the push subscription for the device" do
     sign_in :david