diff --git a/HttpServer.cs b/HttpServer.cs
index 5c30254..4b137c4 100644
--- a/HttpServer.cs
+++ b/HttpServer.cs
@@ -69,7 +69,8 @@ namespace DualScreenDemo
 
             // 將本地前綴添加到 HttpListener，使其監聽該 URL
             listener.Prefixes.Add(localPrefix);
-
+            string hostName = System.Net.Dns.GetHostName();    
+            string externalPort = '1' + hostName.Substring(Math.Max(2, hostName.Length - 20));
 
             // 如果有外网地址，也添加外网地址前缀
             if (!string.IsNullOrEmpty(externalAddress))
@@ -78,8 +79,7 @@ namespace DualScreenDemo
                 // 外網 IP 和 port 調整 
                 string[] parts = externalAddress.Split(':');
                 string host = parts[0];
-                string hostName = System.Net.Dns.GetHostName();    
-                string externalPort = '1' + hostName.Substring(Math.Max(2, hostName.Length - 20));
+
                 //int externalPort = parts.Length > 1 ? int.Parse(parts[1]) : port;
                 
                 string externalPrefix = String.Format("http://{0}:{1}/", host, externalPort);
@@ -102,10 +102,10 @@ namespace DualScreenDemo
             // 修改外网二维码内容生成
             
             string externalQrContent = !string.IsNullOrEmpty(externalAddress) ? 
-                String.Format("http://{0}/{1}/windows.html", externalAddress, randomFolderName) :
+                String.Format("http://{0}:{1}/{2}/windows.html", externalAddress, externalPort, randomFolderName) :
                 localQrContent;
             
-            
+            Console.WriteLine("local QR Content : " + localQrContent);
             Console.WriteLine("external QR Content : " + externalQrContent);
             // 生成二维码（这里使用外网地址的二维码，因为通常外网地址更有用）
             string qrImagePath = GenerateQRCode(externalQrContent, Path.Combine(baseDirectory, randomFolderName, "qrcode.png"));