diff --git a/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigSingboxService.cs b/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigSingboxService.cs
index 7e9574fa..e9d197c0 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigSingboxService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigSingboxService.cs
@@ -2235,7 +2235,7 @@ public class CoreConfigSingboxService
                     continue;
                 }
             }
-            else if (outbound.detour.IsNullOrEmpty() && (!customConfig.ProxyDetour.IsNullOrEmpty()))
+            else if (outbound.detour.IsNullOrEmpty() && (!customConfig.ProxyDetour.IsNullOrEmpty()) && !Utils.IsPrivateNetwork(outbound.server ?? string.Empty))
             {
                 outbound.detour = customConfig.ProxyDetour;
             }
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigV2rayService.cs b/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigV2rayService.cs
index b332381d..dfb21e3f 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigV2rayService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigV2rayService.cs
@@ -1909,7 +1909,7 @@ public class CoreConfigV2rayService
                     continue;
                 }
             }
-            else if ((outbound.streamSettings?.sockopt?.dialerProxy.IsNullOrEmpty() == true) && (!customConfig.ProxyDetour.IsNullOrEmpty()))
+            else if ((outbound.streamSettings?.sockopt?.dialerProxy.IsNullOrEmpty() == true) && (!customConfig.ProxyDetour.IsNullOrEmpty()) && !(Utils.IsPrivateNetwork(outbound.settings?.servers?.FirstOrDefault()?.address ?? string.Empty) || Utils.IsPrivateNetwork(outbound.settings?.vnext?.FirstOrDefault()?.address ?? string.Empty)))
             {
                 outbound.streamSettings ??= new StreamSettings4Ray();
                 outbound.streamSettings.sockopt ??= new Sockopt4Ray();