diff --git a/v2rayN/v2rayN/Handler/ConfigHandler.cs b/v2rayN/v2rayN/Handler/ConfigHandler.cs
index c8bc583e..76148041 100644
--- a/v2rayN/v2rayN/Handler/ConfigHandler.cs
+++ b/v2rayN/v2rayN/Handler/ConfigHandler.cs
@@ -69,13 +69,7 @@ namespace v2rayN.Handler
                 };
 
                 config.inbound.Add(inItem);
-
-                //inItem = new InItem();
-                //inItem.protocol = "http";
-                //inItem.localPort = 1081;
-                //inItem.udpEnabled = true;
-
-                //config.inbound.Add(inItem);
+                 
             }
             else
             {
diff --git a/v2rayN/v2rayN/Handler/CoreConfigHandler.cs b/v2rayN/v2rayN/Handler/CoreConfigHandler.cs
index 4d418e1b..21374738 100644
--- a/v2rayN/v2rayN/Handler/CoreConfigHandler.cs
+++ b/v2rayN/v2rayN/Handler/CoreConfigHandler.cs
@@ -132,8 +132,8 @@ namespace v2rayN.Handler
                                 fileContent.RemoveAt(indexPort);
                             }
 
-                            fileContent.Add($"port: {LazyConfig.Instance.GetLocalPort(Global.InboundHttp)}");
-                            fileContent.Add($"socks-port: {LazyConfig.Instance.GetLocalPort(Global.InboundSocks)}");
+                            fileContent.Add($"port: {LazyConfig.Instance.GetLocalPort(EInboundProtocol.http)}");
+                            fileContent.Add($"socks-port: {LazyConfig.Instance.GetLocalPort(EInboundProtocol.socks)}");
                             break;
                     }
                     File.WriteAllLines(fileName, fileContent);
diff --git a/v2rayN/v2rayN/Handler/CoreConfigSingbox.cs b/v2rayN/v2rayN/Handler/CoreConfigSingbox.cs
index 6feb2f55..f726e754 100644
--- a/v2rayN/v2rayN/Handler/CoreConfigSingbox.cs
+++ b/v2rayN/v2rayN/Handler/CoreConfigSingbox.cs
@@ -121,7 +121,7 @@ namespace v2rayN.Handler
                     };
                     singboxConfig.inbounds.Add(inbound);
 
-                    inbound.listen_port = LazyConfig.Instance.GetLocalPort(Global.InboundSocks);
+                    inbound.listen_port = LazyConfig.Instance.GetLocalPort(EInboundProtocol.socks);
                     inbound.sniff = _config.inbound[0].sniffingEnabled;
                     inbound.sniff_override_destination = _config.inbound[0].routeOnly ? false : _config.inbound[0].sniffingEnabled;
                     inbound.domain_strategy = Utile.IsNullOrEmpty(_config.routingBasicItem.domainStrategy4Singbox) ? null : _config.routingBasicItem.domainStrategy4Singbox;
@@ -405,13 +405,13 @@ namespace v2rayN.Handler
 
                 switch (node.GetNetwork())
                 {
-                    case "h2":
-                        transport.type = "http";
+                    case nameof(ETransport.h2):
+                        transport.type = nameof(ETransport.http);
                         transport.host = Utile.IsNullOrEmpty(node.requestHost) ? null : Utile.String2List(node.requestHost);
                         transport.path = Utile.IsNullOrEmpty(node.path) ? null : node.path;
                         break;
 
-                    case "tcp":   //http
+                    case nameof(ETransport.tcp):   //http
                         if (node.headerType == Global.TcpHeaderHttp)
                         {
                             if (node.configType == EConfigType.Shadowsocks)
@@ -421,7 +421,7 @@ namespace v2rayN.Handler
                             }
                             else
                             {
-                                transport.type = "http";
+                                transport.type = nameof(ETransport.http);
                                 transport.host = Utile.IsNullOrEmpty(node.requestHost) ? null : Utile.String2List(node.requestHost);
                                 transport.path = Utile.IsNullOrEmpty(node.path) ? null : node.path;
                             }
@@ -433,8 +433,8 @@ namespace v2rayN.Handler
 
                         break;
 
-                    case "ws":
-                        transport.type = "ws";
+                    case nameof(ETransport.ws):
+                        transport.type = nameof(ETransport.ws);
                         transport.path = Utile.IsNullOrEmpty(node.path) ? null : node.path;
                         if (!Utile.IsNullOrEmpty(node.requestHost))
                         {
@@ -445,12 +445,12 @@ namespace v2rayN.Handler
                         }
                         break;
 
-                    case "quic":
-                        transport.type = "quic";
+                    case nameof(ETransport.quic):
+                        transport.type = nameof(ETransport.quic);
                         break;
 
-                    case "grpc":
-                        transport.type = "grpc";
+                    case nameof(ETransport.grpc):
+                        transport.type = nameof(ETransport.grpc);
                         transport.service_name = node.path;
                         transport.idle_timeout = _config.grpcItem.idle_timeout.ToString("##s");
                         transport.ping_timeout = _config.grpcItem.health_check_timeout.ToString("##s");
@@ -881,7 +881,7 @@ namespace v2rayN.Handler
                 singboxConfig.inbounds.Clear(); // Remove "proxy" service for speedtest, avoiding port conflicts.
                 singboxConfig.outbounds.RemoveAt(0);
 
-                int httpPort = LazyConfig.Instance.GetLocalPort("speedtest");
+                int httpPort = LazyConfig.Instance.GetLocalPort(EInboundProtocol.speedtest);
 
                 foreach (var it in selecteds)
                 {
diff --git a/v2rayN/v2rayN/Handler/CoreConfigV2ray.cs b/v2rayN/v2rayN/Handler/CoreConfigV2ray.cs
index 54f1a270..6d457798 100644
--- a/v2rayN/v2rayN/Handler/CoreConfigV2ray.cs
+++ b/v2rayN/v2rayN/Handler/CoreConfigV2ray.cs
@@ -111,11 +111,11 @@ namespace v2rayN.Handler
                 {
                     if (_config.inbound[0].newPort4LAN)
                     {
-                        Inbounds4Ray inbound3 = GetInbound(_config.inbound[0], Global.InboundSocks2, 2, true);
+                        var inbound3 = GetInbound(_config.inbound[0], Global.InboundSocks2, 2, true);
                         inbound3.listen = "0.0.0.0";
                         v2rayConfig.inbounds.Add(inbound3);
 
-                        Inbounds4Ray inbound4 = GetInbound(_config.inbound[0], Global.InboundHttp2, 3, false);
+                        var inbound4 = GetInbound(_config.inbound[0], Global.InboundHttp2, 3, false);
                         inbound4.listen = "0.0.0.0";
                         v2rayConfig.inbounds.Add(inbound4);
 
@@ -564,7 +564,7 @@ namespace v2rayN.Handler
                 //streamSettings
                 switch (node.GetNetwork())
                 {
-                    case "kcp":
+                    case nameof(ETransport.kcp):
                         KcpSettings4Ray kcpSettings = new()
                         {
                             mtu = _config.kcpItem.mtu,
@@ -588,7 +588,7 @@ namespace v2rayN.Handler
                         streamSettings.kcpSettings = kcpSettings;
                         break;
                     //ws
-                    case "ws":
+                    case nameof(ETransport.ws):
                         WsSettings4Ray wsSettings = new();
                         wsSettings.headers = new Headers4Ray();
                         string path = node.path;
@@ -608,7 +608,7 @@ namespace v2rayN.Handler
 
                         break;
                     //h2
-                    case "h2":
+                    case nameof(ETransport.h2):
                         HttpSettings4Ray httpSettings = new();
 
                         if (!string.IsNullOrWhiteSpace(host))
@@ -621,7 +621,7 @@ namespace v2rayN.Handler
 
                         break;
                     //quic
-                    case "quic":
+                    case nameof(ETransport.quic):
                         QuicSettings4Ray quicsettings = new()
                         {
                             security = host,
@@ -645,7 +645,7 @@ namespace v2rayN.Handler
                         }
                         break;
 
-                    case "grpc":
+                    case nameof(ETransport.grpc):
                         GrpcSettings4Ray grpcSettings = new()
                         {
                             serviceName = node.path,
@@ -923,7 +923,7 @@ namespace v2rayN.Handler
                 v2rayConfig.inbounds.Clear(); // Remove "proxy" service for speedtest, avoiding port conflicts.
                 v2rayConfig.outbounds.RemoveAt(0);
 
-                int httpPort = LazyConfig.Instance.GetLocalPort("speedtest");
+                int httpPort = LazyConfig.Instance.GetLocalPort(EInboundProtocol.speedtest);
 
                 foreach (var it in selecteds)
                 {
diff --git a/v2rayN/v2rayN/Handler/DownloadHandle.cs b/v2rayN/v2rayN/Handler/DownloadHandle.cs
index 67000d65..9162c86c 100644
--- a/v2rayN/v2rayN/Handler/DownloadHandle.cs
+++ b/v2rayN/v2rayN/Handler/DownloadHandle.cs
@@ -4,6 +4,7 @@ using System.Net;
 using System.Net.Http;
 using System.Net.Http.Headers;
 using System.Net.Sockets;
+using v2rayN.Model;
 using v2rayN.Resx;
 
 namespace v2rayN.Handler
@@ -311,7 +312,7 @@ namespace v2rayN.Handler
             {
                 return null;
             }
-            var httpPort = LazyConfig.Instance.GetLocalPort(Global.InboundHttp);
+            var httpPort = LazyConfig.Instance.GetLocalPort(EInboundProtocol.http);
             if (!SocketCheck(Global.Loopback, httpPort))
             {
                 return null;
diff --git a/v2rayN/v2rayN/Handler/LazyConfig.cs b/v2rayN/v2rayN/Handler/LazyConfig.cs
index 2cc46fac..1b13a035 100644
--- a/v2rayN/v2rayN/Handler/LazyConfig.cs
+++ b/v2rayN/v2rayN/Handler/LazyConfig.cs
@@ -19,7 +19,7 @@ namespace v2rayN.Handler
             {
                 if (_statePort is null)
                 {
-                    _statePort = Utile.GetFreePort(GetLocalPort(Global.InboundAPITagName));
+                    _statePort = Utile.GetFreePort(GetLocalPort(EInboundProtocol.api));
                 }
 
                 return _statePort.Value;
@@ -50,20 +50,10 @@ namespace v2rayN.Handler
             return _config;
         }
 
-        public int GetLocalPort(string protocol)
+        public int GetLocalPort(EInboundProtocol protocol)
         {
-            var localPort = _config.inbound.FirstOrDefault(t => t.protocol == Global.InboundSocks)?.localPort ?? 10808;
-            return protocol.ToLower() switch
-            {
-                Global.InboundSocks => localPort,
-                Global.InboundHttp => localPort + 1,
-                Global.InboundSocks2 => localPort + 2,
-                Global.InboundHttp2 => localPort + 3,
-                "pac" => localPort + 4,
-                Global.InboundAPITagName => localPort + 11,
-                "speedtest" => localPort + 21,
-                _ => localPort,
-            };
+            var localPort = _config.inbound.FirstOrDefault(t => t.protocol == nameof(EInboundProtocol.socks))?.localPort ?? 10808;
+            return localPort + (int)protocol;
         }
 
         public void AddProcess(IntPtr processHandle)
diff --git a/v2rayN/v2rayN/Handler/ShareHandler.cs b/v2rayN/v2rayN/Handler/ShareHandler.cs
index 3704cce6..4a240d11 100644
--- a/v2rayN/v2rayN/Handler/ShareHandler.cs
+++ b/v2rayN/v2rayN/Handler/ShareHandler.cs
@@ -310,11 +310,11 @@ namespace v2rayN.Handler
                 dicQuery.Add("spx", Utile.UrlEncode(item.spiderX));
             }
 
-            dicQuery.Add("type", !Utile.IsNullOrEmpty(item.network) ? item.network : "tcp");
+            dicQuery.Add("type", !Utile.IsNullOrEmpty(item.network) ? item.network : nameof(ETransport.tcp));
 
             switch (item.network)
             {
-                case "tcp":
+                case nameof(ETransport.tcp):
                     dicQuery.Add("headerType", !Utile.IsNullOrEmpty(item.headerType) ? item.headerType : Global.None);
                     if (!Utile.IsNullOrEmpty(item.requestHost))
                     {
@@ -322,7 +322,7 @@ namespace v2rayN.Handler
                     }
                     break;
 
-                case "kcp":
+                case nameof(ETransport.kcp):
                     dicQuery.Add("headerType", !Utile.IsNullOrEmpty(item.headerType) ? item.headerType : Global.None);
                     if (!Utile.IsNullOrEmpty(item.path))
                     {
@@ -330,7 +330,7 @@ namespace v2rayN.Handler
                     }
                     break;
 
-                case "ws":
+                case nameof(ETransport.ws):
                     if (!Utile.IsNullOrEmpty(item.requestHost))
                     {
                         dicQuery.Add("host", Utile.UrlEncode(item.requestHost));
@@ -341,9 +341,9 @@ namespace v2rayN.Handler
                     }
                     break;
 
-                case "http":
-                case "h2":
-                    dicQuery["type"] = "http";
+                case nameof(ETransport.http):
+                case nameof(ETransport.h2):
+                    dicQuery["type"] = nameof(ETransport.http);
                     if (!Utile.IsNullOrEmpty(item.requestHost))
                     {
                         dicQuery.Add("host", Utile.UrlEncode(item.requestHost));
@@ -354,13 +354,13 @@ namespace v2rayN.Handler
                     }
                     break;
 
-                case "quic":
+                case nameof(ETransport.quic):
                     dicQuery.Add("headerType", !Utile.IsNullOrEmpty(item.headerType) ? item.headerType : Global.None);
                     dicQuery.Add("quicSecurity", Utile.UrlEncode(item.requestHost));
                     dicQuery.Add("key", Utile.UrlEncode(item.path));
                     break;
 
-                case "grpc":
+                case nameof(ETransport.grpc):
                     if (!Utile.IsNullOrEmpty(item.path))
                     {
                         dicQuery.Add("serviceName", Utile.UrlEncode(item.path));
@@ -599,32 +599,32 @@ namespace v2rayN.Handler
             i.network = m.Groups["network"].Value;
             switch (i.network)
             {
-                case "tcp":
+                case nameof(ETransport.tcp):
                     string t1 = query["type"] ?? Global.None;
                     i.headerType = t1;
                     break;
 
-                case "kcp":
+                case nameof(ETransport.kcp):
                     i.headerType = query["type"] ?? Global.None;
                     break;
 
-                case "ws":
+                case nameof(ETransport.ws):
                     string p1 = query["path"] ?? "/";
                     string h1 = query["host"] ?? "";
                     i.requestHost = Utile.UrlDecode(h1);
                     i.path = p1;
                     break;
 
-                case "http":
-                case "h2":
-                    i.network = "h2";
+                case nameof(ETransport.http):
+                case nameof(ETransport.h2):
+                    i.network = nameof(ETransport.h2);
                     string p2 = query["path"] ?? "/";
                     string h2 = query["host"] ?? "";
                     i.requestHost = Utile.UrlDecode(h2);
                     i.path = p2;
                     break;
 
-                case "quic":
+                case nameof(ETransport.quic):
                     string s = query["security"] ?? Global.None;
                     string k = query["key"] ?? "";
                     string t3 = query["type"] ?? Global.None;
@@ -945,39 +945,39 @@ namespace v2rayN.Handler
             item.shortId = Utile.UrlDecode(query["sid"] ?? "");
             item.spiderX = Utile.UrlDecode(query["spx"] ?? "");
 
-            item.network = query["type"] ?? "tcp";
+            item.network = query["type"] ?? nameof(ETransport.tcp);
             switch (item.network)
             {
-                case "tcp":
+                case nameof(ETransport.tcp):
                     item.headerType = query["headerType"] ?? Global.None;
                     item.requestHost = Utile.UrlDecode(query["host"] ?? "");
 
                     break;
 
-                case "kcp":
+                case nameof(ETransport.kcp):
                     item.headerType = query["headerType"] ?? Global.None;
                     item.path = Utile.UrlDecode(query["seed"] ?? "");
                     break;
 
-                case "ws":
+                case nameof(ETransport.ws):
                     item.requestHost = Utile.UrlDecode(query["host"] ?? "");
                     item.path = Utile.UrlDecode(query["path"] ?? "/");
                     break;
 
-                case "http":
-                case "h2":
-                    item.network = "h2";
+                case nameof(ETransport.http):
+                case nameof(ETransport.h2):
+                    item.network = nameof(ETransport.h2);
                     item.requestHost = Utile.UrlDecode(query["host"] ?? "");
                     item.path = Utile.UrlDecode(query["path"] ?? "/");
                     break;
 
-                case "quic":
+                case nameof(ETransport.quic):
                     item.headerType = query["headerType"] ?? Global.None;
                     item.requestHost = query["quicSecurity"] ?? Global.None;
                     item.path = Utile.UrlDecode(query["key"] ?? "");
                     break;
 
-                case "grpc":
+                case nameof(ETransport.grpc):
                     item.path = Utile.UrlDecode(query["serviceName"] ?? "");
                     item.headerType = Utile.UrlDecode(query["mode"] ?? Global.GrpcGunMode);
                     break;
diff --git a/v2rayN/v2rayN/Handler/SysProxyHandle.cs b/v2rayN/v2rayN/Handler/SysProxyHandle.cs
index 5b2c2507..f71b0f68 100644
--- a/v2rayN/v2rayN/Handler/SysProxyHandle.cs
+++ b/v2rayN/v2rayN/Handler/SysProxyHandle.cs
@@ -41,9 +41,9 @@ namespace v2rayN.Handler
 
             try
             {
-                int port = LazyConfig.Instance.GetLocalPort(Global.InboundHttp);
-                int portSocks = LazyConfig.Instance.GetLocalPort(Global.InboundSocks);
-                int portPac = LazyConfig.Instance.GetLocalPort(ESysProxyType.Pac.ToString());
+                int port = LazyConfig.Instance.GetLocalPort(EInboundProtocol.http);
+                int portSocks = LazyConfig.Instance.GetLocalPort(EInboundProtocol.socks);
+                int portPac = LazyConfig.Instance.GetLocalPort(EInboundProtocol.pac);
                 if (port <= 0)
                 {
                     return false;
diff --git a/v2rayN/v2rayN/Model/EInboundProtocol.cs b/v2rayN/v2rayN/Model/EInboundProtocol.cs
new file mode 100644
index 00000000..7e322b8e
--- /dev/null
+++ b/v2rayN/v2rayN/Model/EInboundProtocol.cs
@@ -0,0 +1,13 @@
+namespace v2rayN.Model
+{
+    public enum EInboundProtocol
+    {
+        socks = 0,
+        http,
+        socks2,
+        http2,
+        pac,
+        api = 11,
+        speedtest = 21
+    }
+}
\ No newline at end of file
diff --git a/v2rayN/v2rayN/Model/ETransport.cs b/v2rayN/v2rayN/Model/ETransport.cs
new file mode 100644
index 00000000..0351aa52
--- /dev/null
+++ b/v2rayN/v2rayN/Model/ETransport.cs
@@ -0,0 +1,13 @@
+namespace v2rayN.Model
+{
+    public enum ETransport
+    {
+        tcp,
+        kcp,
+        ws,
+        h2,
+        http,
+        quic,
+        grpc
+    }
+}
\ No newline at end of file
diff --git a/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs b/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs
index ea6d2e04..a17079c1 100644
--- a/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs
+++ b/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs
@@ -1811,7 +1811,7 @@ namespace v2rayN.ViewModels
         public void InboundDisplayStaus()
         {
             StringBuilder sb = new();
-            sb.Append($"[{Global.InboundSocks}:{LazyConfig.Instance.GetLocalPort(Global.InboundSocks)}]");
+            sb.Append($"[{Global.InboundSocks}:{LazyConfig.Instance.GetLocalPort(EInboundProtocol.socks)}]");
             sb.Append(" | ");
             //if (_config.sysProxyType == ESysProxyType.ForcedChange)
             //{
@@ -1819,7 +1819,7 @@ namespace v2rayN.ViewModels
             //}
             //else
             //{
-            sb.Append($"[{Global.InboundHttp}:{LazyConfig.Instance.GetLocalPort(Global.InboundHttp)}]");
+            sb.Append($"[{Global.InboundHttp}:{LazyConfig.Instance.GetLocalPort(EInboundProtocol.http)}]");
             //}
             InboundDisplay = $"{ResUI.LabLocal}:{sb}";
 
@@ -1828,9 +1828,9 @@ namespace v2rayN.ViewModels
                 if (_config.inbound[0].newPort4LAN)
                 {
                     StringBuilder sb2 = new();
-                    sb2.Append($"[{Global.InboundSocks}:{LazyConfig.Instance.GetLocalPort(Global.InboundSocks2)}]");
+                    sb2.Append($"[{Global.InboundSocks}:{LazyConfig.Instance.GetLocalPort(EInboundProtocol.socks2)}]");
                     sb2.Append(" | ");
-                    sb2.Append($"[{Global.InboundHttp}:{LazyConfig.Instance.GetLocalPort(Global.InboundHttp2)}]");
+                    sb2.Append($"[{Global.InboundHttp}:{LazyConfig.Instance.GetLocalPort(EInboundProtocol.http2)}]");
                     InboundLanDisplay = $"{ResUI.LabLAN}:{sb2}";
                 }
                 else
diff --git a/v2rayN/v2rayN/Views/AddServerWindow.xaml.cs b/v2rayN/v2rayN/Views/AddServerWindow.xaml.cs
index 07107a0a..c9c5c8ed 100644
--- a/v2rayN/v2rayN/Views/AddServerWindow.xaml.cs
+++ b/v2rayN/v2rayN/Views/AddServerWindow.xaml.cs
@@ -284,7 +284,7 @@ namespace v2rayN.Views
                 cmbHeaderType.Items.Add(Global.None);
                 cmbHeaderType.Items.Add(Global.TcpHeaderHttp);
             }
-            else if (network is "kcp" or "quic")
+            else if (network is nameof(ETransport.kcp) or nameof(ETransport.quic))
             {
                 cmbHeaderType.Items.Add(Global.None);
                 Global.KcpHeaderTypes.ForEach(it =>
@@ -292,7 +292,7 @@ namespace v2rayN.Views
                     cmbHeaderType.Items.Add(it);
                 });
             }
-            else if (network == "grpc")
+            else if (network == nameof(ETransport.grpc))
             {
                 cmbHeaderType.Items.Add(Global.GrpcGunMode);
                 cmbHeaderType.Items.Add(Global.GrpcMultiMode);
@@ -318,33 +318,33 @@ namespace v2rayN.Views
 
             switch (network)
             {
-                case Global.DefaultNetwork:
+                case nameof(ETransport.tcp):
                     tipRequestHost.Text = ResUI.TransportRequestHostTip1;
                     tipHeaderType.Text = ResUI.TransportHeaderTypeTip1;
                     break;
 
-                case "kcp":
+                case nameof(ETransport.kcp):
                     tipHeaderType.Text = ResUI.TransportHeaderTypeTip2;
                     tipPath.Text = ResUI.TransportPathTip5;
                     break;
 
-                case "ws":
+                case nameof(ETransport.ws):
                     tipRequestHost.Text = ResUI.TransportRequestHostTip2;
                     tipPath.Text = ResUI.TransportPathTip1;
                     break;
 
-                case "h2":
+                case nameof(ETransport.h2):
                     tipRequestHost.Text = ResUI.TransportRequestHostTip3;
                     tipPath.Text = ResUI.TransportPathTip2;
                     break;
 
-                case "quic":
+                case nameof(ETransport.quic):
                     tipRequestHost.Text = ResUI.TransportRequestHostTip4;
                     tipPath.Text = ResUI.TransportPathTip3;
                     tipHeaderType.Text = ResUI.TransportHeaderTypeTip3;
                     break;
 
-                case "grpc":
+                case nameof(ETransport.grpc):
                     tipPath.Text = ResUI.TransportPathTip4;
                     tipHeaderType.Text = ResUI.TransportHeaderTypeTip4;
                     labHeaderType.Visibility = Visibility.Hidden;