diff --git a/Netch/Controllers/MainController.cs b/Netch/Controllers/MainController.cs
index 1bf80a06..fa332191 100644
--- a/Netch/Controllers/MainController.cs
+++ b/Netch/Controllers/MainController.cs
@@ -34,7 +34,7 @@ namespace Netch.Controllers
 
             if (await DnsUtils.LookupAsync(server.Hostname) == null)
                 throw new MessageException(i18N.Translate("Lookup Server hostname failed"));
-            
+
             // TODO Disable NAT Type Test setting
             // cache STUN Server ip to prevent "Wrong STUN Server"
             DnsUtils.LookupAsync(Global.Settings.STUN_Server).Forget();
@@ -182,7 +182,20 @@ namespace Netch.Controllers
         public static async Task<int?> HttpConnectAsync(CancellationToken ctx = default)
         {
             Debug.Assert(Socks5Server != null, nameof(Socks5Server) + " != null");
-            return await Socks5ServerTestUtils.HttpConnectAsync(Socks5Server, ctx);
+            try
+            {
+                return await Socks5ServerTestUtils.HttpConnectAsync(Socks5Server, ctx);
+            }
+            catch (OperationCanceledException)
+            {
+                // ignored
+            }
+            catch (Exception e)
+            {
+                Log.Warning(e, "Unhandled Socks5ServerTestUtils.HttpConnectAsync Exception");
+            }
+
+            return null;
         }
     }
 }
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