diff --git a/v2rayN/ServiceLib/Handler/ConfigHandler.cs b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
index 9f401fba..89b8b2f6 100644
--- a/v2rayN/ServiceLib/Handler/ConfigHandler.cs
+++ b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
@@ -1511,7 +1511,8 @@ public static class ConfigHandler
         else if (node.ConfigType == EConfigType.Custom
             && node.PreSocksPort is > 0 and <= 65535)
         {
-            var preCoreType = config.TunModeItem.EnableTun ? ECoreType.sing_box : ECoreType.Xray;
+            var customPreCoreType = AppManager.Instance.GetCoreType(null, EConfigType.Custom);
+            var preCoreType = (enableLegacyProtect && config.TunModeItem.EnableTun) ? ECoreType.sing_box : customPreCoreType;
             itemSocks = new ProfileItem()
             {
                 CoreType = preCoreType,
diff --git a/v2rayN/ServiceLib/Manager/AppManager.cs b/v2rayN/ServiceLib/Manager/AppManager.cs
index de16cf35..72d29305 100644
--- a/v2rayN/ServiceLib/Manager/AppManager.cs
+++ b/v2rayN/ServiceLib/Manager/AppManager.cs
@@ -663,7 +663,7 @@ public sealed class AppManager
         return Global.SsSecuritiesInSingbox;
     }
 
-    public ECoreType GetCoreType(ProfileItem profileItem, EConfigType eConfigType)
+    public ECoreType GetCoreType(ProfileItem? profileItem, EConfigType eConfigType)
     {
         if (profileItem?.CoreType != null)
         {
diff --git a/v2rayN/v2rayN.Desktop/Views/OptionSettingWindow.axaml b/v2rayN/v2rayN.Desktop/Views/OptionSettingWindow.axaml
index 926de8a4..5b39896b 100644
--- a/v2rayN/v2rayN.Desktop/Views/OptionSettingWindow.axaml
+++ b/v2rayN/v2rayN.Desktop/Views/OptionSettingWindow.axaml
@@ -1114,7 +1114,7 @@
                         Grid.Column="0"
                         Margin="{StaticResource Margin4}"
                         VerticalAlignment="Center"
-                        Text="Custom" />
+                        Text="Custom Pre" />
                     <ComboBox
                         x:Name="cmbCoreType2"
                         Grid.Row="2"
diff --git a/v2rayN/v2rayN/Views/OptionSettingWindow.xaml b/v2rayN/v2rayN/Views/OptionSettingWindow.xaml
index 4abe772d..be2e84c9 100644
--- a/v2rayN/v2rayN/Views/OptionSettingWindow.xaml
+++ b/v2rayN/v2rayN/Views/OptionSettingWindow.xaml
@@ -1388,7 +1388,7 @@
                         Margin="{StaticResource Margin8}"
                         VerticalAlignment="Center"
                         Style="{StaticResource ToolbarTextBlock}"
-                        Text="Custom" />
+                        Text="Custom Pre" />
                     <ComboBox
                         x:Name="cmbCoreType2"
                         Grid.Row="2"