diff --git a/Netch/Controllers/HTTPController.cs b/Netch/Controllers/HTTPController.cs
index 0963ff29..3d86eb4c 100644
--- a/Netch/Controllers/HTTPController.cs
+++ b/Netch/Controllers/HTTPController.cs
@@ -38,7 +38,7 @@ namespace Netch.Controllers
                     Global.Settings.Pac_Port = PortHelper.GetAvailablePort();
                 }
 
-                pacUrl = PACServerHandle.InitPACServer("127.0.0.1");
+                pacUrl = PACServerHandle.InitPACServer();
             }
 
             if (mode.Type is 3)
@@ -76,7 +76,22 @@ namespace Netch.Controllers
                     if (_oldState != null)
                     {
                         using var service = new ProxyService();
-                        service.Set(_oldState!);
+                        try
+                        {
+                            if (_oldState.IsProxy && _oldState.ProxyServer == service.Query().ProxyServer ||
+                                _oldState.IsAutoProxyUrl && _oldState.AutoConfigUrl!.StartsWith(PACServerHandle.PacPrefix))
+                            {
+                                service.Direct();
+                                return;
+                            }
+
+                            service.Set(_oldState);
+                        }
+                        catch
+                        {
+                            service.Direct();
+                            throw;
+                        }
                     }
                 })
             };
diff --git a/Netch/Utils/HttpProxyHandler/PACServerHandle.cs b/Netch/Utils/HttpProxyHandler/PACServerHandle.cs
index c252233a..d4c6451b 100644
--- a/Netch/Utils/HttpProxyHandler/PACServerHandle.cs
+++ b/Netch/Utils/HttpProxyHandler/PACServerHandle.cs
@@ -14,15 +14,15 @@ namespace Netch.Utils.HttpProxyHandler
     {
         private static HttpWebServer? _httpWebServer;
         private static string? _pacContent;
+        public static readonly string PacPrefix= $"http://127.0.0.1:{Global.Settings.Pac_Port}/pac/";
 
-        public static string InitPACServer(string address)
+        public static string InitPACServer()
         {
             try
             {
-                _pacContent = GetPacList(address);
-                var prefixes = $"http://{address}:{Global.Settings.Pac_Port}/pac/";
+                _pacContent = GetPacList("127.0.0.1");
 
-                _httpWebServer = new HttpWebServer(SendResponse, prefixes);
+                _httpWebServer = new HttpWebServer(SendResponse, PacPrefix);
                 Task.Run(() => _httpWebServer.StartWaitingRequest());
 
                 var pacUrl = GetPacUrl();
@@ -77,7 +77,7 @@ namespace Netch.Utils.HttpProxyHandler
         /// <returns></returns>
         public static string GetPacUrl()
         {
-            return $"http://127.0.0.1:{Global.Settings.Pac_Port}/pac/?t={DateTime.Now:yyyyMMddHHmmssfff}";
+            return PacPrefix + $"?t={DateTime.Now:yyyyMMddHHmmssfff}";
         }
     }
 }
\ No newline at end of file