[client] Improve error surfacing for restricted daemon sockets (#7704)

* Add probe for daemon restriction and improve error surfacing

client/cmd/daemon_access_unix_test.go

@@ -0,0 +1,46 @@
+//go:build !windows
+
+package cmd
+
+import (
+	"context"
+	"errors"
+	"net"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// A socket the caller may not write must fail the dial with the denial, well
+// before the dial timeout.
+func TestDialClientGRPCServer_SocketRefusesCaller(t *testing.T) {
+	if os.Geteuid() == 0 {
+		t.Skip("root bypasses socket file permissions")
+	}
+	dir, err := os.MkdirTemp("", "nbdial")
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = os.RemoveAll(dir) })
+	path := filepath.Join(dir, "d.sock")
+	ln, err := net.Listen("unix", path)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = ln.Close() })
+	require.NoError(t, os.Chmod(path, 0o000))
+
+	start := time.Now()
+	_, err = DialClientGRPCServer(context.Background(), "unix://"+path)
+	elapsed := time.Since(start)
+
+	require.Error(t, err)
+	assert.ErrorIs(t, err, errDaemonAccessDenied)
+	assert.Less(t, elapsed, 5*time.Second, "a refused socket must not wait out the dial timeout")
+	assert.Equal(t, errDaemonAccessDenied, daemonConnectError(err), "the denial is reported without the start-the-service hint")
+}
+
+func TestDaemonConnectError_KeepsServiceHintOtherwise(t *testing.T) {
+	err := daemonConnectError(errors.New("context deadline exceeded"))
+	assert.Contains(t, err.Error(), "netbird service start", "a daemon that did not answer keeps the hint to start it")
+}

client/cmd/daemon_error.go

@@ -14,6 +14,21 @@ import (
 	"github.com/netbirdio/netbird/client/internal/ipcauth"
 )
 
+// errDaemonAccessDenied reports that the daemon socket refuses this user.
+var errDaemonAccessDenied = errors.New("this account is not allowed to use the NetBird daemon on this device: " +
+	"an administrator restricted it to other users or groups")
+
+// daemonConnectError explains a failed dial.
+func daemonConnectError(err error) error {
+	if errors.Is(err, errDaemonAccessDenied) {
+		return err
+	}
+	// nolint
+	return fmt.Errorf("failed to connect to daemon error: %w\n"+
+		"If the daemon is not running please run: "+
+		"\nnetbird service install \nnetbird service start\n", err)
+}
+
 // daemonCallError adds the context a failed daemon call happened in.
 func daemonCallError(context string, err error) error {
 	return fmt.Errorf("%s: %w", context, err)

client/cmd/login.go

@@ -99,10 +99,7 @@ var loginCmd = &cobra.Command{
 func doDaemonLogin(ctx context.Context, cmd *cobra.Command, providedSetupKey string, activeProf *profilemanager.Profile, username string, pm *profilemanager.ProfileManager) error {
 	conn, err := DialClientGRPCServer(ctx, daemonAddr)
 	if err != nil {
-		//nolint
-		return fmt.Errorf("failed to connect to daemon error: %v\n"+
-			"If the daemon is not running please run: "+
-			"\nnetbird service install \nnetbird service start\n", err)
+		return daemonConnectError(err)
 	}
 	defer conn.Close()
 
@@ -174,10 +171,7 @@ func doDaemonLogin(ctx context.Context, cmd *cobra.Command, providedSetupKey str
 func doExtendSession(ctx context.Context, cmd *cobra.Command, activeProf *profilemanager.Profile) error {
 	conn, err := DialClientGRPCServer(ctx, daemonAddr)
 	if err != nil {
-		//nolint
-		return fmt.Errorf("failed to connect to daemon error: %v\n"+
-			"If the daemon is not running please run: "+
-			"\nnetbird service install \nnetbird service start\n", err)
+		return daemonConnectError(err)
 	}
 	defer conn.Close()
 
@@ -286,10 +280,7 @@ func switchProfileOnDaemon(ctx context.Context, pm *profilemanager.ProfileManage
 func switchProfile(ctx context.Context, handle string, username string) (profilemanager.ID, error) {
 	conn, err := DialClientGRPCServer(ctx, daemonAddr)
 	if err != nil {
-		//nolint
-		return "", fmt.Errorf("failed to connect to daemon error: %v\n"+
-			"If the daemon is not running please run: "+
-			"\nnetbird service install \nnetbird service start\n", err)
+		return "", daemonConnectError(err)
 	}
 	defer conn.Close()
 

client/cmd/root.go

@@ -12,6 +12,7 @@ import (
 	"runtime"
 	"slices"
 	"strings"
+	"sync/atomic"
 	"syscall"
 	"time"
 
@@ -299,7 +300,35 @@ func DialClientGRPCServer(ctx context.Context, addr string) (*grpc.ClientConn, e
 		grpc.WithChainStreamInterceptor(denialStreamInterceptor),
 	)
 
-	return grpc.DialContext(ctx, target, opts...)
+	denied := watchAccessDenied(ctx, cancel, addr)
+	conn, err := grpc.DialContext(ctx, target, opts...)
+	if err != nil && denied.Load() {
+		return nil, errDaemonAccessDenied
+	}
+	return conn, err
+}
+
+// accessProbeDelay is how long a dial may block before the socket is probed.
+const accessProbeDelay = 500 * time.Millisecond
+
+// watchAccessDenied probes addr after accessProbeDelay and cancels the dial if
+// the socket refuses this user.
+func watchAccessDenied(ctx context.Context, cancel context.CancelFunc, addr string) *atomic.Bool {
+	denied := &atomic.Bool{}
+	go func() {
+		timer := time.NewTimer(accessProbeDelay)
+		defer timer.Stop()
+		select {
+		case <-ctx.Done():
+			return
+		case <-timer.C:
+		}
+		if daddr.DeniesCaller(ctx, addr) {
+			denied.Store(true)
+			cancel()
+		}
+	}()
+	return denied
 }
 
 // terminalLoginError reports whether a Login failure is final, so the backoff
@@ -499,10 +528,7 @@ func getClient(cmd *cobra.Command) (*grpc.ClientConn, error) {
 
 	conn, err := DialClientGRPCServer(cmd.Context(), daemonAddr)
 	if err != nil {
-		//nolint
-		return nil, fmt.Errorf("failed to connect to daemon error: %v\n"+
-			"If the daemon is not running please run: "+
-			"\nnetbird service install \nnetbird service start\n", err)
+		return nil, daemonConnectError(err)
 	}
 
 	return conn, nil

client/cmd/status.go

@@ -192,10 +192,7 @@ func statusFunc(cmd *cobra.Command, args []string) error {
 func getStatus(ctx context.Context, fullPeerStatus bool, shouldRunProbes bool) (*proto.StatusResponse, error) {
 	conn, err := DialClientGRPCServer(ctx, daemonAddr)
 	if err != nil {
-		//nolint
-		return nil, fmt.Errorf("failed to connect to daemon error: %v\n"+
-			"If the daemon is not running please run: "+
-			"\nnetbird service install \nnetbird service start\n", err)
+		return nil, daemonConnectError(err)
 	}
 	defer conn.Close()
 

client/cmd/up.go

@@ -184,10 +184,7 @@ func switchOrCreateProfile(ctx context.Context, pm *profilemanager.ProfileManage
 func createProfile(ctx context.Context, profileName, username string) (profilemanager.ID, error) {
 	conn, err := DialClientGRPCServer(ctx, daemonAddr)
 	if err != nil {
-		//nolint
-		return "", fmt.Errorf("failed to connect to daemon error: %v\n"+
-			"If the daemon is not running please run: "+
-			"\nnetbird service install \nnetbird service start\n", err)
+		return "", daemonConnectError(err)
 	}
 	defer conn.Close()
 
@@ -285,10 +282,7 @@ func runInDaemonMode(ctx context.Context, cmd *cobra.Command, pm *profilemanager
 
 	conn, err := DialClientGRPCServer(ctx, daemonAddr)
 	if err != nil {
-		//nolint
-		return fmt.Errorf("failed to connect to daemon error: %v\n"+
-			"If the daemon is not running please run: "+
-			"\nnetbird service install \nnetbird service start\n", err)
+		return daemonConnectError(err)
 	}
 	defer func() {
 		err := conn.Close()

client/internal/daemonaddr/pipe_windows.go

@@ -6,6 +6,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"io/fs"
 	"net"
 
 	"github.com/Microsoft/go-winio"
@@ -16,13 +17,17 @@ import (
 )
 
 // dialPipePaths connects to the first path that answers with a pipe server this
-// client may trust, and returns the last error when none does.
+// client may trust. When none does, it returns an access-denied error if any
+// path gave one, and the last error otherwise.
 func dialPipePaths(ctx context.Context, paths []string) (net.Conn, error) {
-	var lastErr error
+	var lastErr, deniedErr error
 	for _, path := range paths {
 		conn, err := dialPipe(ctx, path)
 		if err != nil {
 			log.Debugf("dial daemon pipe %s: %v", path, err)
+			if deniedErr == nil && errors.Is(err, fs.ErrPermission) {
+				deniedErr = err
+			}
 			lastErr = err
 			continue
 		}
@@ -43,6 +48,9 @@ func dialPipePaths(ctx context.Context, paths []string) (net.Conn, error) {
 		return conn, nil
 	}
 
+	if deniedErr != nil {
+		return nil, deniedErr
+	}
 	if lastErr == nil {
 		lastErr = errors.New("no daemon pipe to connect to")
 	}

client/internal/daemonaddr/pipe_windows_test.go

@@ -0,0 +1,48 @@
+//go:build windows
+
+package daemonaddr
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io/fs"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/Microsoft/go-winio"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// A denied first path and a missing second path must return the denial.
+func TestDialPipePaths_PrefersAccessDenied(t *testing.T) {
+	base := fmt.Sprintf(`\\.\pipe\netbird-test-%d-%d`, os.Getpid(), time.Now().UnixNano())
+	denied := base + "-denied"
+
+	// An empty DACL denies everyone.
+	ln, err := winio.ListenPipe(denied, &winio.PipeConfig{SecurityDescriptor: "D:P"})
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = ln.Close() })
+
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+
+	_, err = dialPipePaths(ctx, []string{denied, base + "-missing"})
+	require.Error(t, err)
+	assert.True(t, errors.Is(err, fs.ErrPermission), "want the access-denied error, got %v", err)
+	assert.True(t, DeniesCaller(context.Background(), "npipe://"+denied), "a pipe whose DACL refuses the caller must report a denial")
+}
+
+func TestDialPipePaths_MissingIsNotDenied(t *testing.T) {
+	missing := fmt.Sprintf(`\\.\pipe\netbird-test-%d-%d-missing`, os.Getpid(), time.Now().UnixNano())
+
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+
+	_, err := dialPipePaths(ctx, []string{missing})
+	require.Error(t, err)
+	assert.False(t, errors.Is(err, fs.ErrPermission), "a missing pipe is not a denial: %v", err)
+	assert.False(t, DeniesCaller(context.Background(), "npipe://"+missing), "a stopped daemon is not a denial")
+}

client/internal/daemonaddr/probe.go

@@ -0,0 +1,52 @@
+package daemonaddr
+
+import (
+	"context"
+	"errors"
+	"io/fs"
+	"net"
+	"strings"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+)
+
+// accessProbeTimeout bounds the probe.
+const accessProbeTimeout = time.Second
+
+// DeniesCaller reports whether the OS refuses this process access to the daemon
+// socket or pipe at addr. It dials without gRPC, trying up to two candidate
+// pipe paths on Windows; loopback TCP is never probed.
+func DeniesCaller(ctx context.Context, addr string) bool {
+	ctx, cancel := context.WithTimeout(ctx, accessProbeTimeout)
+	defer cancel()
+
+	conn, err := dialRaw(ctx, addr)
+	if err != nil {
+		return errors.Is(err, fs.ErrPermission)
+	}
+	if err := conn.Close(); err != nil {
+		log.Debugf("close daemon access probe: %v", err)
+	}
+	return false
+}
+
+func dialRaw(ctx context.Context, addr string) (net.Conn, error) {
+	if name, ok := strings.CutPrefix(addr, pipeScheme); ok {
+		return dialPipePaths(ctx, PipePaths(name))
+	}
+	if path, ok := unixSocketPath(addr); ok {
+		var d net.Dialer
+		return d.DialContext(ctx, "unix", path)
+	}
+	// Loopback TCP is never group-restricted.
+	return nil, errors.New("no socket access to probe for " + addr)
+}
+
+// unixSocketPath accepts unix:///abs and unix:path.
+func unixSocketPath(addr string) (string, bool) {
+	if path, ok := strings.CutPrefix(addr, "unix://"); ok {
+		return path, true
+	}
+	return strings.CutPrefix(addr, "unix:")
+}

client/internal/daemonaddr/probe_unix_test.go

@@ -0,0 +1,66 @@
+//go:build !windows
+
+package daemonaddr
+
+import (
+	"context"
+	"net"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func listenTestSocket(t *testing.T) string {
+	t.Helper()
+	// Keeps the path under the macOS sun_path limit.
+	dir, err := os.MkdirTemp("", "nbprobe")
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = os.RemoveAll(dir) })
+
+	path := filepath.Join(dir, "d.sock")
+	ln, err := net.Listen("unix", path)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = ln.Close() })
+	return path
+}
+
+// The kernel refuses connect to a socket the caller may not write.
+func TestDeniesCaller_SocketWithoutPermission(t *testing.T) {
+	if os.Geteuid() == 0 {
+		t.Skip("root bypasses socket file permissions")
+	}
+	path := listenTestSocket(t)
+	require.NoError(t, os.Chmod(path, 0o000))
+
+	assert.True(t, DeniesCaller(context.Background(), "unix://"+path), "a socket the caller may not write must report a denial")
+}
+
+func TestDeniesCaller_ReachableDaemon(t *testing.T) {
+	path := listenTestSocket(t)
+
+	assert.False(t, DeniesCaller(context.Background(), "unix://"+path), "a socket that accepts the caller is not a denial")
+	assert.False(t, DeniesCaller(context.Background(), "unix:"+path), "the unix:path spelling must probe the same socket")
+}
+
+// A missing or stale socket is not a denial.
+func TestDeniesCaller_DaemonNotRunning(t *testing.T) {
+	missing := filepath.Join(t.TempDir(), "missing.sock")
+	assert.False(t, DeniesCaller(context.Background(), "unix://"+missing), "a missing socket is not a denial")
+
+	dir, err := os.MkdirTemp("", "nbprobe")
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = os.RemoveAll(dir) })
+	stale := filepath.Join(dir, "s.sock")
+	ln, err := net.Listen("unix", stale)
+	require.NoError(t, err)
+	ln.(*net.UnixListener).SetUnlinkOnClose(false)
+	require.NoError(t, ln.Close())
+	assert.False(t, DeniesCaller(context.Background(), "unix://"+stale), "a stale socket is not a denial")
+}
+
+func TestDeniesCaller_TCPIsNeverDenied(t *testing.T) {
+	assert.False(t, DeniesCaller(context.Background(), "127.0.0.1:1"), "loopback TCP cannot be group-restricted")
+}

client/ui/frontend/src/components/empty-state/DaemonUnavailableOverlay.tsx

@@ -12,10 +12,17 @@ function openUrl(url: string) {
 
 export const DaemonUnavailableOverlay = () => {
     const { t } = useTranslation();
-    const { isDaemonUnavailable } = useStatus();
+    const { isDaemonUnavailable, isDaemonAccessDenied } = useStatus();
 
     if (!isDaemonUnavailable) return null;
 
+    const title = isDaemonAccessDenied
+        ? t("daemon.accessDenied.title")
+        : t("daemon.unavailable.title");
+    const description = isDaemonAccessDenied
+        ? t("daemon.accessDenied.description")
+        : t("daemon.unavailable.description");
+
     return (
         <div
             className={
@@ -32,20 +39,18 @@ export const DaemonUnavailableOverlay = () => {
                 </div>
 
                 <div className={"flex flex-col items-center gap-1"}>
-                    <p className={"text-base font-medium text-nb-gray-50"}>
-                        {t("daemon.unavailable.title")}
-                    </p>
-                    <p className={"text-sm text-nb-gray-300"}>
-                        {t("daemon.unavailable.description")}
-                    </p>
+                    <p className={"text-base font-medium text-nb-gray-50"}>{title}</p>
+                    <p className={"text-sm text-nb-gray-300"}>{description}</p>
                 </div>
 
-                <div className={"wails-no-draggable"}>
-                    <Button variant={"secondary"} size={"xs"} onClick={() => openUrl(DOCS_URL)}>
-                        <BookText size={14} />
-                        {t("daemon.unavailable.docsLink")}
-                    </Button>
-                </div>
+                {!isDaemonAccessDenied && (
+                    <div className={"wails-no-draggable"}>
+                        <Button variant={"secondary"} size={"xs"} onClick={() => openUrl(DOCS_URL)}>
+                            <BookText size={14} />
+                            {t("daemon.unavailable.docsLink")}
+                        </Button>
+                    </div>
+                )}
             </div>
         </div>
     );

client/ui/frontend/src/contexts/StatusContext.tsx

@@ -22,6 +22,7 @@ type StatusContextValue = {
     refresh: () => Promise<void>;
     isReady: boolean;
     isDaemonUnavailable: boolean;
+    isDaemonAccessDenied: boolean;
     isDaemonAvailable: boolean;
     isDaemonOutdated: boolean;
 };
@@ -65,7 +66,9 @@ export const StatusProvider = ({ children }: { children: ReactNode }) => {
     }, [refresh]);
 
     const isReady = status !== null;
-    const isDaemonUnavailable = isReady && status.status === "DaemonUnavailable";
+    const isDaemonAccessDenied = isReady && status.status === "DaemonAccessDenied";
+    const isDaemonUnavailable =
+        isReady && (status.status === "DaemonUnavailable" || isDaemonAccessDenied);
     const isDaemonAvailable = isReady && !isDaemonUnavailable;
 
     useEffect(() => {
@@ -90,10 +93,20 @@ export const StatusProvider = ({ children }: { children: ReactNode }) => {
             refresh,
             isReady,
             isDaemonUnavailable,
+            isDaemonAccessDenied,
             isDaemonAvailable,
             isDaemonOutdated,
         }),
-        [status, error, refresh, isReady, isDaemonUnavailable, isDaemonAvailable, isDaemonOutdated],
+        [
+            status,
+            error,
+            refresh,
+            isReady,
+            isDaemonUnavailable,
+            isDaemonAccessDenied,
+            isDaemonAvailable,
+            isDaemonOutdated,
+        ],
     );
 
     return (

client/ui/frontend/src/lib/errors.ts

@@ -62,11 +62,11 @@ export const formatErrorMessage = (e: unknown): string => {
 export const errorCommand = (e: unknown): string => classify(e)?.command ?? "";
 
 // isDaemonUnavailable reports whether an error means the daemon could not be
-// reached, so a caller can retry quietly instead of putting a dialog up while
-// the service is still starting. Matches the classified code first and the raw
+// reached or refuses this user. Matches the classified code first and the raw
 // gRPC status text second, since not every service classifies its errors.
 export const isDaemonUnavailable = (e: unknown): boolean => {
-    if (classify(e)?.code === "daemon_unreachable") return true;
+    const code = classify(e)?.code;
+    if (code === "daemon_unreachable" || code === "daemon_access_denied") return true;
     const msg = e instanceof Error ? e.message : String(e);
     return msg.includes("code = Unavailable");
 };

client/ui/frontend/src/modules/main/MainConnectionStatusSwitch.tsx

@@ -47,7 +47,7 @@ export const MainConnectionStatusSwitch = () => {
 
     const daemonState = status?.status ?? "Idle";
     const needsLogin = NEEDS_LOGIN_STATES.has(daemonState);
-    const unreachable = daemonState === "DaemonUnavailable";
+    const unreachable = daemonState === "DaemonUnavailable" || daemonState === "DaemonAccessDenied";
 
     type Action = "connect" | "logging-in" | "disconnect" | null;
     const [action, setAction] = useState<Action>(null);
@@ -81,6 +81,7 @@ export const MainConnectionStatusSwitch = () => {
             case "LoginFailed":
             case "SessionExpired":
             case "DaemonUnavailable":
+            case "DaemonAccessDenied":
                 return ConnectionState.Disconnected;
             default:
                 return ConnectionState.Disconnected;

client/ui/grpc.go

@@ -3,6 +3,7 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"runtime"
 	"sync"
@@ -60,6 +61,11 @@ func (c *Conn) Client() (proto.DaemonServiceClient, error) {
 	return c.client, nil
 }
 
+// DeniesCaller reports whether the daemon socket refuses this user.
+func (c *Conn) DeniesCaller(ctx context.Context) bool {
+	return daemonaddr.DeniesCaller(ctx, daemonaddr.ResolveDaemonAddr(c.addr))
+}
+
 // DaemonAddr returns the default daemon gRPC address: a Unix socket on
 // Linux/macOS, a named pipe on Windows. The pipe carries the caller's token,
 // which loopback TCP does not, so the daemon can tell who is calling.

client/ui/i18n/locales/de/common.json

@@ -1411,5 +1411,17 @@
     },
     "error.profile_unowned": {
         "message": "Dieses Profil hat noch keinen Besitzer."
+    },
+    "tray.status.daemonAccessDenied": {
+        "message": "Kein Zugriff"
+    },
+    "daemon.accessDenied.title": {
+        "message": "Kein Zugriff auf den NetBird-Dienst"
+    },
+    "daemon.accessDenied.description": {
+        "message": "Ihr Administrator hat den NetBird-Dienst auf diesem Gerät auf ausgewählte Benutzer oder Gruppen beschränkt, und Ihr Konto gehört nicht dazu. Wenden Sie sich für den Zugriff an Ihren Administrator."
+    },
+    "error.daemon_access_denied": {
+        "message": "Ihr Konto darf den NetBird-Dienst auf diesem Gerät nicht verwenden. Wenden Sie sich für den Zugriff an Ihren Administrator."
     }
 }

client/ui/i18n/locales/en/common.json

@@ -11,6 +11,10 @@
         "message": "Not running",
         "description": "Tray status: the background NetBird service (daemon) is not running."
     },
+    "tray.status.daemonAccessDenied": {
+        "message": "No access",
+        "description": "Tray status: the NetBird background service is running, but this user account is not allowed to use it. Keep short."
+    },
     "tray.status.error": {
         "message": "Error",
         "description": "Tray status: the client is in an error state."
@@ -1775,6 +1779,14 @@
         "message": "Documentation",
         "description": "Documentation link on the daemon-unavailable overlay."
     },
+    "daemon.accessDenied.title": {
+        "message": "No Access to the NetBird Service",
+        "description": "Title of the overlay shown when the NetBird background service is running but refuses this user account."
+    },
+    "daemon.accessDenied.description": {
+        "message": "Your administrator has restricted the NetBird service on this device to selected users or groups, and your account is not one of them. Contact your administrator for access.",
+        "description": "Body of the access-denied overlay: the service is limited to certain accounts by an administrator and this one is not allowed."
+    },
     "daemon.outdated.title": {
         "message": "NetBird Client Is Outdated",
         "description": "Title of the overlay shown when the NetBird client (daemon) is too old to drive this UI."
@@ -1815,6 +1827,10 @@
         "message": "The NetBird daemon is not responding. Please check that the service is running.",
         "description": "Error: the NetBird background service isn't responding. 'daemon' = the background service."
     },
+    "error.daemon_access_denied": {
+        "message": "Your account is not allowed to use the NetBird service on this device. Contact your administrator for access.",
+        "description": "Error: the NetBird background service refused this user account because an administrator restricted it to other users or groups."
+    },
     "error.settings_locked": {
         "message": "Settings cannot be changed on this device: an administrator has locked them.",
         "description": "Error: the local daemon was started with update-settings disabled, so it refuses configuration changes."

client/ui/i18n/locales/es/common.json

@@ -1411,5 +1411,17 @@
     },
     "error.profile_unowned": {
         "message": "Este perfil aún no tiene propietario."
+    },
+    "tray.status.daemonAccessDenied": {
+        "message": "Sin acceso"
+    },
+    "daemon.accessDenied.title": {
+        "message": "Sin acceso al servicio NetBird"
+    },
+    "daemon.accessDenied.description": {
+        "message": "Su administrador ha restringido el servicio NetBird en este dispositivo a determinados usuarios o grupos, y su cuenta no es uno de ellos. Póngase en contacto con su administrador para obtener acceso."
+    },
+    "error.daemon_access_denied": {
+        "message": "Su cuenta no tiene permiso para usar el servicio NetBird en este dispositivo. Póngase en contacto con su administrador para obtener acceso."
     }
 }

client/ui/i18n/locales/fr/common.json

@@ -1411,5 +1411,17 @@
     },
     "error.profile_unowned": {
         "message": "Ce profil n'a pas encore de propriétaire."
+    },
+    "tray.status.daemonAccessDenied": {
+        "message": "Aucun accès"
+    },
+    "daemon.accessDenied.title": {
+        "message": "Aucun accès au service NetBird"
+    },
+    "daemon.accessDenied.description": {
+        "message": "Votre administrateur a limité le service NetBird sur cet appareil à certains utilisateurs ou groupes, et votre compte n’en fait pas partie. Contactez votre administrateur pour obtenir l’accès."
+    },
+    "error.daemon_access_denied": {
+        "message": "Votre compte n’est pas autorisé à utiliser le service NetBird sur cet appareil. Contactez votre administrateur pour obtenir l’accès."
     }
 }

client/ui/i18n/locales/hu/common.json

@@ -1411,5 +1411,17 @@
     },
     "error.profile_unowned": {
         "message": "Ennek a profilnak még nincs tulajdonosa."
+    },
+    "tray.status.daemonAccessDenied": {
+        "message": "Nincs hozzáférés"
+    },
+    "daemon.accessDenied.title": {
+        "message": "Nincs hozzáférés a NetBird szolgáltatáshoz"
+    },
+    "daemon.accessDenied.description": {
+        "message": "A rendszergazda ezen az eszközön kiválasztott felhasználókra vagy csoportokra korlátozta a NetBird szolgáltatást, és az Ön fiókja nincs köztük. A hozzáférésért forduljon a rendszergazdához."
+    },
+    "error.daemon_access_denied": {
+        "message": "Az Ön fiókja nem használhatja a NetBird szolgáltatást ezen az eszközön. A hozzáférésért forduljon a rendszergazdához."
     }
 }

client/ui/i18n/locales/it/common.json

@@ -1411,5 +1411,17 @@
     },
     "error.profile_unowned": {
         "message": "Questo profilo non ha ancora un proprietario."
+    },
+    "tray.status.daemonAccessDenied": {
+        "message": "Nessun accesso"
+    },
+    "daemon.accessDenied.title": {
+        "message": "Nessun accesso al servizio NetBird"
+    },
+    "daemon.accessDenied.description": {
+        "message": "L’amministratore ha limitato il servizio NetBird su questo dispositivo ad alcuni utenti o gruppi, e il tuo account non è tra questi. Contatta l’amministratore per ottenere l’accesso."
+    },
+    "error.daemon_access_denied": {
+        "message": "Il Suo account non è autorizzato a usare il servizio NetBird su questo dispositivo. Contatti l'amministratore per ottenere l'accesso."
     }
 }

client/ui/i18n/locales/ja/common.json

@@ -1411,5 +1411,17 @@
     },
     "error.profile_unowned": {
         "message": "このプロファイルにはまだ所有者がいません。"
+    },
+    "tray.status.daemonAccessDenied": {
+        "message": "アクセス権なし"
+    },
+    "daemon.accessDenied.title": {
+        "message": "NetBird サービスへのアクセス権がありません"
+    },
+    "daemon.accessDenied.description": {
+        "message": "管理者がこのデバイスの NetBird サービスを特定のユーザーまたはグループに制限しており、お使いのアカウントは含まれていません。アクセスについては管理者にお問い合わせください。"
+    },
+    "error.daemon_access_denied": {
+        "message": "お使いのアカウントには、このデバイスで NetBird サービスを使用する権限がありません。アクセスについては管理者にお問い合わせください。"
     }
 }

client/ui/i18n/locales/pt/common.json

@@ -1411,5 +1411,17 @@
     },
     "error.profile_unowned": {
         "message": "Este perfil ainda não tem proprietário."
+    },
+    "tray.status.daemonAccessDenied": {
+        "message": "Sem acesso"
+    },
+    "daemon.accessDenied.title": {
+        "message": "Sem acesso ao serviço NetBird"
+    },
+    "daemon.accessDenied.description": {
+        "message": "O seu administrador restringiu o serviço NetBird neste dispositivo a determinados usuários ou grupos, e a sua conta não é um deles. Contate o seu administrador para obter acesso."
+    },
+    "error.daemon_access_denied": {
+        "message": "A sua conta não tem permissão para usar o serviço NetBird neste dispositivo. Contacte o seu administrador para obter acesso."
     }
 }

client/ui/i18n/locales/ru/common.json

@@ -1411,5 +1411,17 @@
     },
     "error.profile_unowned": {
         "message": "У этого профиля пока нет владельца."
+    },
+    "tray.status.daemonAccessDenied": {
+        "message": "Нет доступа"
+    },
+    "daemon.accessDenied.title": {
+        "message": "Нет доступа к службе NetBird"
+    },
+    "daemon.accessDenied.description": {
+        "message": "Администратор ограничил доступ к службе NetBird на этом устройстве выбранными пользователями или группами, и ваша учётная запись в их число не входит. Обратитесь к администратору за доступом."
+    },
+    "error.daemon_access_denied": {
+        "message": "Вашей учётной записи не разрешено использовать службу NetBird на этом устройстве. Обратитесь к администратору за доступом."
     }
 }

client/ui/i18n/locales/uk/common.json

@@ -1411,5 +1411,17 @@
     },
     "error.profile_unowned": {
         "message": "Цей профіль ще не має власника."
+    },
+    "tray.status.daemonAccessDenied": {
+        "message": "Немає доступу"
+    },
+    "daemon.accessDenied.title": {
+        "message": "Немає доступу до служби NetBird"
+    },
+    "daemon.accessDenied.description": {
+        "message": "Адміністратор обмежив доступ до служби NetBird на цьому пристрої вибраними користувачами або групами, і ваш обліковий запис до них не входить. Зверніться до адміністратора щодо доступу."
+    },
+    "error.daemon_access_denied": {
+        "message": "Вашому обліковому запису не дозволено використовувати службу NetBird на цьому пристрої. Зверніться до адміністратора щодо доступу."
     }
 }

client/ui/i18n/locales/zh-CN/common.json

@@ -1411,5 +1411,17 @@
     },
     "error.profile_unowned": {
         "message": "此配置文件尚未设置所有者。"
+    },
+    "tray.status.daemonAccessDenied": {
+        "message": "无访问权限"
+    },
+    "daemon.accessDenied.title": {
+        "message": "无权访问 NetBird 服务"
+    },
+    "daemon.accessDenied.description": {
+        "message": "管理员已将此设备上的 NetBird 服务限制为指定的用户或组，而您的帐户不在其中。请联系管理员获取访问权限。"
+    },
+    "error.daemon_access_denied": {
+        "message": "您的帐户无权在此设备上使用 NetBird 服务。请联系管理员获取访问权限。"
     }
 }

client/ui/localizer.go

@@ -115,6 +115,8 @@ func (l *Localizer) StatusLabel(status string) string {
 		return l.T("tray.status.disconnected")
 	case strings.EqualFold(status, services.StatusDaemonUnavailable):
 		return l.T("tray.status.daemonUnavailable")
+	case strings.EqualFold(status, services.StatusDaemonAccessDenied):
+		return l.T("tray.status.daemonAccessDenied")
 	case strings.EqualFold(status, services.StatusConnected):
 		return l.T("tray.status.connected")
 	case strings.EqualFold(status, services.StatusConnecting):

client/ui/services/conn.go

@@ -2,7 +2,11 @@
 
 package services
 
-import "github.com/netbirdio/netbird/client/proto"
+import (
+	"context"
+
+	"github.com/netbirdio/netbird/client/proto"
+)
 
 // DaemonConn returns a lazy gRPC client to the NetBird daemon.
 // All services receive a DaemonConn so they share a single connection.
@@ -10,4 +14,10 @@ type DaemonConn interface {
 	Client() (proto.DaemonServiceClient, error)
 }
 
+// AccessProber is implemented by a DaemonConn that can probe whether the daemon
+// socket refuses this user.
+type AccessProber interface {
+	DeniesCaller(ctx context.Context) bool
+}
+
 func ptrStr(s string) *string { return &s }

client/ui/services/daemon_feed.go

@@ -37,6 +37,9 @@ const (
 	// StatusDaemonUnavailable is the synthetic Status emitted when the daemon's
 	// gRPC socket is unreachable. No internal.Status* collides with this label.
 	StatusDaemonUnavailable = "DaemonUnavailable"
+	// StatusDaemonAccessDenied is the synthetic Status emitted when the daemon
+	// socket refuses this user.
+	StatusDaemonAccessDenied = "DaemonAccessDenied"
 
 	// Daemon connection status strings — mirror internal.Status* in
 	// client/internal/state.go.
@@ -245,20 +248,21 @@ func (s *DaemonFeed) ServiceShutdown() error {
 }
 
 // Get returns the current daemon status snapshot. An unreachable daemon socket
-// yields Status{Status: StatusDaemonUnavailable} rather than an error, so the
-// frontend keys off a single status enum without a parallel "error" path.
+// yields a synthetic StatusDaemonUnavailable or StatusDaemonAccessDenied rather
+// than an error, so the frontend keys off a single status enum without a
+// parallel "error" path.
 func (s *DaemonFeed) Get(ctx context.Context) (Status, error) {
 	cli, err := s.conn.Client()
 	if err != nil {
 		if isDaemonUnreachable(err) {
-			return Status{Status: StatusDaemonUnavailable}, nil
+			return Status{Status: s.unreachableStatus(ctx)}, nil
 		}
 		return Status{}, err
 	}
 	resp, err := cli.Status(ctx, &proto.StatusRequest{GetFullPeerStatus: true})
 	if err != nil {
 		if isDaemonUnreachable(err) {
-			return Status{Status: StatusDaemonUnavailable}, nil
+			return Status{Status: s.unreachableStatus(ctx)}, nil
 		}
 		return Status{}, err
 	}
@@ -291,7 +295,7 @@ func (s *DaemonFeed) consumeForSwitch(st Status) (suppress, triggerLogin bool) {
 			strings.EqualFold(st.Status, StatusNeedsLogin),
 			strings.EqualFold(st.Status, StatusLoginFailed),
 			strings.EqualFold(st.Status, StatusSessionExpired),
-			strings.EqualFold(st.Status, StatusDaemonUnavailable):
+			IsDaemonOutage(st.Status):
 			// New flow has begun (Up started, or daemon refused it).
 			s.switchInProgress = false
 		default:
@@ -311,7 +315,7 @@ func (s *DaemonFeed) consumeForSwitch(st Status) (suppress, triggerLogin bool) {
 			return false, true
 		case strings.EqualFold(st.Status, StatusConnected),
 			strings.EqualFold(st.Status, StatusIdle),
-			strings.EqualFold(st.Status, StatusDaemonUnavailable):
+			IsDaemonOutage(st.Status):
 			// Terminal but not SSO — disarm without triggering.
 			s.switchLoginWatch = false
 		}
@@ -336,18 +340,19 @@ func (s *DaemonFeed) statusStreamLoop(ctx context.Context) {
 		Clock:               backoff.SystemClock,
 	}, ctx)
 
-	// unavailable fires the synthetic event once per outage, not on every retry.
-	unavailable := false
+	// outage is the synthetic status last emitted, reset once the stream recovers.
+	outage := ""
 	emitUnavailable := func() {
-		if unavailable {
+		st := s.unreachableStatus(ctx)
+		if st == outage {
 			return
 		}
-		unavailable = true
-		s.emitter.Emit(EventStatusSnapshot, Status{Status: StatusDaemonUnavailable})
+		outage = st
+		s.emitter.Emit(EventStatusSnapshot, Status{Status: st})
 	}
 
 	op := func() error {
-		return s.subscribeAndStreamStatus(ctx, &unavailable, emitUnavailable)
+		return s.subscribeAndStreamStatus(ctx, &outage, emitUnavailable)
 	}
 
 	if err := backoff.Retry(op, bo); err != nil && ctx.Err() == nil {
@@ -358,7 +363,7 @@ func (s *DaemonFeed) statusStreamLoop(ctx context.Context) {
 // subscribeAndStreamStatus is one attempt of the status backoff loop: open
 // SubscribeStatus and re-emit every snapshot until it errors. A daemon-
 // unreachable failure also flips the synthetic-unavailable signal.
-func (s *DaemonFeed) subscribeAndStreamStatus(ctx context.Context, unavailable *bool, emitUnavailable func()) error {
+func (s *DaemonFeed) subscribeAndStreamStatus(ctx context.Context, outage *string, emitUnavailable func()) error {
 	cli, err := s.conn.Client()
 	if err != nil {
 		emitUnavailable()
@@ -376,7 +381,7 @@ func (s *DaemonFeed) subscribeAndStreamStatus(ctx context.Context, unavailable *
 		if err != nil {
 			return s.handleStatusRecvErr(ctx, err, emitUnavailable)
 		}
-		*unavailable = false
+		*outage = ""
 		s.emitStatus(statusFromProto(resp))
 	}
 }
@@ -574,6 +579,21 @@ func systemEventFromProto(e *proto.SystemEvent) SystemEvent {
 	return out
 }
 
+// IsDaemonOutage reports whether status is a synthetic unreachable status.
+func IsDaemonOutage(status string) bool {
+	return strings.EqualFold(status, StatusDaemonUnavailable) ||
+		strings.EqualFold(status, StatusDaemonAccessDenied)
+}
+
+// unreachableStatus returns StatusDaemonAccessDenied when the daemon socket
+// refuses this user, and StatusDaemonUnavailable otherwise.
+func (s *DaemonFeed) unreachableStatus(ctx context.Context) string {
+	if p, ok := s.conn.(AccessProber); ok && p.DeniesCaller(ctx) {
+		return StatusDaemonAccessDenied
+	}
+	return StatusDaemonUnavailable
+}
+
 // isDaemonUnreachable reports whether a gRPC error means the daemon socket isn't
 // answering, versus the daemon responding with an application-level code. Only
 // the former should flip the tray to "Not running" — a daemon returning e.g.

client/ui/services/daemon_feed_test.go

@@ -0,0 +1,114 @@
+//go:build !android && !ios && !freebsd && !js
+
+package services
+
+import (
+	"context"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	gstatus "google.golang.org/grpc/status"
+
+	"github.com/netbirdio/netbird/client/proto"
+)
+
+// unreachableDaemon fails every call with Unavailable.
+type unreachableDaemon struct {
+	proto.DaemonServiceClient
+}
+
+func (unreachableDaemon) Status(context.Context, *proto.StatusRequest, ...grpc.CallOption) (*proto.StatusResponse, error) {
+	return nil, gstatus.Error(codes.Unavailable, "connection error")
+}
+
+func (unreachableDaemon) SubscribeStatus(context.Context, *proto.StatusRequest, ...grpc.CallOption) (grpc.ServerStreamingClient[proto.StatusResponse], error) {
+	return nil, gstatus.Error(codes.Unavailable, "connection error")
+}
+
+// probingConn is a DaemonConn whose socket probe reports denied.
+type probingConn struct {
+	stubConn
+	denied bool
+}
+
+func (c probingConn) DeniesCaller(context.Context) bool { return c.denied }
+
+type recordingEmitter struct {
+	mu     sync.Mutex
+	events []Status
+	got    chan struct{}
+}
+
+func (e *recordingEmitter) Emit(name string, data ...any) bool {
+	if name != EventStatusSnapshot {
+		return true
+	}
+	e.mu.Lock()
+	e.events = append(e.events, data[0].(Status))
+	e.mu.Unlock()
+	select {
+	case e.got <- struct{}{}:
+	default:
+	}
+	return true
+}
+
+func TestDaemonFeedGet_TellsDenialFromNotRunning(t *testing.T) {
+	tests := []struct {
+		name string
+		conn DaemonConn
+		want string
+	}{
+		{"socket refuses the user", probingConn{stubConn: stubConn{client: unreachableDaemon{}}, denied: true}, StatusDaemonAccessDenied},
+		{"daemon not running", probingConn{stubConn: stubConn{client: unreachableDaemon{}}}, StatusDaemonUnavailable},
+		{"conn cannot probe", stubConn{client: unreachableDaemon{}}, StatusDaemonUnavailable},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			feed := &DaemonFeed{conn: tt.conn}
+			st, err := feed.Get(context.Background())
+			require.NoError(t, err)
+			assert.Equal(t, tt.want, st.Status, "synthetic status for an unreachable daemon")
+		})
+	}
+}
+
+// The denial is emitted once across stream retries.
+func TestDaemonFeedStream_EmitsDenialOnce(t *testing.T) {
+	emitter := &recordingEmitter{got: make(chan struct{}, 1)}
+	feed := &DaemonFeed{
+		conn:    probingConn{stubConn: stubConn{client: unreachableDaemon{}}, denied: true},
+		emitter: emitter,
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	feed.streamWg.Add(1)
+	go feed.statusStreamLoop(ctx)
+
+	select {
+	case <-emitter.got:
+	case <-time.After(5 * time.Second):
+		t.Fatal("no status emitted")
+	}
+	// Let at least one retry run past the first attempt.
+	time.Sleep(1500 * time.Millisecond)
+	cancel()
+	feed.streamWg.Wait()
+
+	emitter.mu.Lock()
+	defer emitter.mu.Unlock()
+	require.NotEmpty(t, emitter.events)
+	assert.Len(t, emitter.events, 1, "the outage is reported once across retries")
+	assert.Equal(t, StatusDaemonAccessDenied, emitter.events[0].Status, "the denial, not not-running")
+}
+
+func TestIsDaemonOutage(t *testing.T) {
+	assert.True(t, IsDaemonOutage(StatusDaemonUnavailable), "not running is an outage")
+	assert.True(t, IsDaemonOutage(StatusDaemonAccessDenied), "a refused user is an outage")
+	assert.False(t, IsDaemonOutage(StatusConnected), "a live daemon is not")
+}

client/ui/services/errors.go

@@ -112,6 +112,8 @@ func (c errorClassifier) classify(err error) *ClientError {
 
 	code := "unknown"
 	switch {
+	case grpcCode == gcodes.Unavailable && isSocketDenial(lower):
+		code = "daemon_access_denied"
 	case strings.Contains(lower, "token used before issued"),
 		strings.Contains(lower, "token is not valid yet"):
 		code = "jwt_clock_skew"
@@ -163,6 +165,15 @@ func (c errorClassifier) classify(err error) *ClientError {
 	}
 }
 
+// isSocketDenial reports whether a lowercased Unavailable message carries an OS
+// access denial on the daemon socket or pipe. "connect: permission denied" is
+// the Unix socket EACCES text and "access is denied" the Windows
+// ERROR_ACCESS_DENIED text; both matched on English OS messages.
+func isSocketDenial(lower string) bool {
+	return strings.Contains(lower, "connect: permission denied") ||
+		strings.Contains(lower, "access is denied")
+}
+
 // classifyDenial presents a refusal the daemon explained: a localised headline
 // for the reasons this build knows, with the daemon's own sentence as the
 // detail the frontend shows under it. An unrecognised reason keeps that sentence

client/ui/services/errors_test.go

@@ -68,6 +68,21 @@ func TestErrorClassifier_Classify(t *testing.T) {
 		require.Equal(t, "daemon_unreachable", ce.Code)
 	})
 
+	// The OS denial on the socket must not be read as a management sign-in
+	// rejection.
+	t.Run("socket denial maps to daemon_access_denied", func(t *testing.T) {
+		unix := gstatus.Error(gcodes.Unavailable, `connection error: desc = "transport: Error while dialing: dial unix /var/run/netbird.sock: connect: permission denied"`)
+		assert.Equal(t, "daemon_access_denied", c.classify(unix).Code, "unix EACCES")
+
+		pipe := gstatus.Error(gcodes.Unavailable, `connection error: desc = "transport: Error while dialing: open \\.\pipe\ProtectedPrefix\Administrators\netbird: Access is denied."`)
+		assert.Equal(t, "daemon_access_denied", c.classify(pipe).Code, "windows ERROR_ACCESS_DENIED")
+	})
+
+	t.Run("missing socket stays daemon_unreachable", func(t *testing.T) {
+		err := gstatus.Error(gcodes.Unavailable, `connection error: desc = "transport: Error while dialing: dial unix /var/run/netbird.sock: connect: no such file or directory"`)
+		assert.Equal(t, "daemon_unreachable", c.classify(err).Code, "a stopped daemon is not a denial")
+	})
+
 	t.Run("unmatched stays unknown", func(t *testing.T) {
 		ce := c.classify(errors.New("something odd"))
 		require.Equal(t, "unknown", ce.Code)

client/ui/services/windowmanager.go

@@ -911,7 +911,7 @@ func (s *WindowManager) watchTriggerLogin() {
 			return
 		}
 		switch st.Status {
-		case StatusConnected, StatusLoginFailed, StatusDaemonUnavailable:
+		case StatusConnected, StatusLoginFailed, StatusDaemonUnavailable, StatusDaemonAccessDenied:
 			s.scheduleHeadlessTeardown()
 		}
 	})

client/ui/tray.go

@@ -348,7 +348,7 @@ func (t *Tray) relayoutMenu() {
 
 	disableProfiles, disableNetworks := t.featuresDisabled()
 
-	daemonUnavailable := strings.EqualFold(lastStatus, services.StatusDaemonUnavailable)
+	daemonUnavailable := services.IsDaemonOutage(lastStatus)
 	connecting := strings.EqualFold(lastStatus, services.StatusConnecting)
 
 	if t.statusItem != nil && lastStatus != "" {

client/ui/tray_icon.go

@@ -63,7 +63,7 @@ func (t *Tray) iconForState() (icon, dark []byte) {
 
 	connecting := strings.EqualFold(statusLabel, services.StatusConnecting)
 	errored := strings.EqualFold(statusLabel, statusError) ||
-		strings.EqualFold(statusLabel, services.StatusDaemonUnavailable)
+		services.IsDaemonOutage(statusLabel)
 	needsLogin := strings.EqualFold(statusLabel, services.StatusNeedsLogin) ||
 		strings.EqualFold(statusLabel, services.StatusSessionExpired) ||
 		strings.EqualFold(statusLabel, services.StatusLoginFailed)

client/ui/tray_status.go

@@ -90,7 +90,7 @@ func (t *Tray) consumePendingConnectLogin(status string) bool {
 		strings.EqualFold(status, services.StatusIdle),
 		strings.EqualFold(status, services.StatusLoginFailed),
 		strings.EqualFold(status, services.StatusSessionExpired),
-		strings.EqualFold(status, services.StatusDaemonUnavailable):
+		services.IsDaemonOutage(status):
 		t.pendingConnectLogin = false
 	}
 	return false
@@ -118,7 +118,7 @@ func statusIndicatorBitmap(status string) []byte {
 	case strings.EqualFold(status, services.StatusLoginFailed),
 		strings.EqualFold(status, statusError):
 		return iconMenuDotError
-	case strings.EqualFold(status, services.StatusDaemonUnavailable):
+	case services.IsDaemonOutage(status):
 		return iconMenuDotOffline
 	default:
 		return iconMenuDotIdle