Fix: SSH tunnel not restarted on unexpected exit

- Add TunnelExited event to SshTunnelService
- Null _process/_lastSpec and dispose the process on unexpected exit, then fire TunnelExited
- Subscribe to TunnelExited in App.xaml.cs with bounded retry backoff (1s/2s/5s/10s/30s)

Agent-Logs-Url: https://github.com/openclaw/openclaw-windows-node/sessions/a69d5952-fc73-46fe-9d2b-e5596c75ea4c

Co-authored-by: shanselman <2892+shanselman@users.noreply.github.com>

src/OpenClaw.Tray.WinUI/App.xaml.cs

@@ -270,6 +270,7 @@ public partial class App : Application
         ToastNotificationManagerCompat.OnActivated += OnToastActivated;
 
         _sshTunnelService = new SshTunnelService(new AppLogger());
+        _sshTunnelService.TunnelExited += OnSshTunnelExited;
 
         // First-run check
         if (string.IsNullOrWhiteSpace(_settings.Token))
@@ -2262,6 +2263,35 @@ public partial class App : Application
         return true;
     }
 
+    private async void OnSshTunnelExited(object? sender, EventArgs e)
+    {
+        if (_isExiting || _settings?.UseSshTunnel != true) return;
+
+        // Attempt to restart the SSH tunnel with bounded exponential backoff.
+        // The gateway client's built-in reconnect loop will pick up automatically
+        // once the tunnel port is available again.
+        int[] retryDelays = [1000, 2000, 5000, 10000, 30000];
+        for (int i = 0; i < retryDelays.Length; i++)
+        {
+            await Task.Delay(retryDelays[i]);
+            if (_isExiting || _settings?.UseSshTunnel != true) return;
+            try
+            {
+                if (EnsureSshTunnelConfigured())
+                {
+                    Logger.Info("SSH tunnel successfully restarted after unexpected exit");
+                    return;
+                }
+            }
+            catch (Exception ex)
+            {
+                Logger.Warn($"SSH tunnel restart attempt {i + 1} failed: {ex.Message}");
+            }
+        }
+
+        Logger.Error("SSH tunnel could not be restarted after all retry attempts");
+    }
+
     #endregion
 
     private Microsoft.UI.Dispatching.DispatcherQueue? AppDispatcherQueue => 

src/OpenClaw.Tray.WinUI/Services/SshTunnelService.cs

@@ -21,6 +21,11 @@ public sealed class SshTunnelService : IDisposable
         _logger = logger;
     }
 
+    /// <summary>
+    /// Raised when the SSH tunnel process exits unexpectedly (i.e., not as a result of <see cref="Stop"/>).
+    /// </summary>
+    public event EventHandler? TunnelExited;
+
     public bool IsRunning => _process is { HasExited: false };
 
     public void EnsureStarted(SettingsManager settings)
@@ -130,6 +135,10 @@ public sealed class SshTunnelService : IDisposable
             else
             {
                 _logger.Warn($"SSH tunnel exited unexpectedly (code {exitCode})");
+                _process = null;
+                _lastSpec = null;
+                try { process.Dispose(); } catch (Exception disposeEx) { _logger.Warn($"SSH tunnel process dispose failed: {disposeEx.Message}"); }
+                TunnelExited?.Invoke(this, EventArgs.Empty);
             }
         };