diff --git a/v2rayN/ServiceLib/Common/Utils.cs b/v2rayN/ServiceLib/Common/Utils.cs
index c5b670cf..b0d3827b 100644
--- a/v2rayN/ServiceLib/Common/Utils.cs
+++ b/v2rayN/ServiceLib/Common/Utils.cs
@@ -435,11 +435,11 @@ public class Utils
         return false;
     }
 
-    public static int GetFreePort(int defaultPort = 9090)
+    public static int GetFreePort(int defaultPort = 0)
     {
         try
         {
-            if (!Utils.PortInUse(defaultPort))
+            if (!(defaultPort == 0 || Utils.PortInUse(defaultPort)))
             {
                 return defaultPort;
             }
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigSingboxService.cs b/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigSingboxService.cs
index 5b87fdcd..eee6a0cd 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigSingboxService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigSingboxService.cs
@@ -785,7 +785,6 @@ public class CoreConfigSingboxService
         try
         {
             endpoint.address = Utils.String2List(node.RequestHost);
-            // Utils.GetFreePort() 9090 ?
             endpoint.listen_port = Utils.GetFreePort();
             endpoint.type = Global.ProtocolTypes[node.ConfigType];