diff --git a/v2rayN/ServiceLib/Common/Utils.cs b/v2rayN/ServiceLib/Common/Utils.cs
index 03a1a860..f7447dfb 100644
--- a/v2rayN/ServiceLib/Common/Utils.cs
+++ b/v2rayN/ServiceLib/Common/Utils.cs
@@ -582,7 +582,7 @@ public class Utils
             var result = await cmd.ExecuteBufferedAsync();
             if (result.IsSuccess)
             {
-                return result.StandardOutput.ToString();
+                return result.StandardOutput ?? "";
             }
 
             Logging.SaveLog(result.ToString() ?? "");
@@ -839,14 +839,46 @@ public class Utils
     public static async Task<string?> SetLinuxChmod(string? fileName)
     {
         if (fileName.IsNullOrEmpty())
+        {
             return null;
+        }
+        if (SetUnixFileMode(fileName))
+        {
+            Logging.SaveLog($"Successfully set the file execution permission, {fileName}");
+            return "";
+        }
+
         if (fileName.Contains(' '))
+        {
             fileName = fileName.AppendQuotes();
-        //File.SetUnixFileMode(fileName, UnixFileMode.UserRead | UnixFileMode.UserWrite | UnixFileMode.UserExecute);
+        }
         var arg = new List<string>() { "-c", $"chmod +x {fileName}" };
         return await GetCliWrapOutput(Global.LinuxBash, arg);
     }
 
+    public static bool SetUnixFileMode(string? fileName)
+    {
+        try
+        {
+            if (fileName.IsNullOrEmpty())
+            {
+                return false;
+            }
+
+            if (File.Exists(fileName))
+            {
+                var currentMode = File.GetUnixFileMode(fileName);
+                File.SetUnixFileMode(fileName, currentMode | UnixFileMode.UserExecute | UnixFileMode.GroupExecute | UnixFileMode.OtherExecute);
+                return true;
+            }
+        }
+        catch (Exception ex)
+        {
+            Logging.SaveLog("SetUnixFileMode", ex);
+        }
+        return false;
+    }
+
     public static async Task<string?> GetLinuxFontFamily(string lang)
     {
         // var arg = new List<string>() { "-c", $"fc-list :lang={lang} family" };