diff --git a/Netch/Controllers/IServerController.cs b/Netch/Controllers/IServerController.cs
index 13989489..dba15b25 100644
--- a/Netch/Controllers/IServerController.cs
+++ b/Netch/Controllers/IServerController.cs
@@ -4,7 +4,7 @@ namespace Netch.Controllers
 {
     public interface IServerController : IController
     {
-        public int? Socks5LocalPort { get; set; }
+        public ushort? Socks5LocalPort { get; set; }
 
         public string LocalAddress { get; set; }
 
@@ -19,7 +19,7 @@ namespace Netch.Controllers
 
     public static class ServerControllerExtension
     {
-        public static int Socks5LocalPort(this IServerController controller)
+        public static ushort Socks5LocalPort(this IServerController controller)
         {
             return controller.Socks5LocalPort ?? Global.Settings.Socks5LocalPort;
         }
diff --git a/Netch/Controllers/MainController.cs b/Netch/Controllers/MainController.cs
index 888cdfc4..d2e4537e 100644
--- a/Netch/Controllers/MainController.cs
+++ b/Netch/Controllers/MainController.cs
@@ -124,7 +124,7 @@ namespace Netch.Controllers
 
         private static async Task<bool> StartMode(Server server, Mode mode)
         {
-            var port = 0;
+            ushort port = 0;
             switch (mode.Type)
             {
                 case 0:
@@ -193,7 +193,7 @@ namespace Netch.Controllers
         /// <param name="portName">端口用途名称</param>
         /// <param name="portType"></param>
         /// <exception cref="PortInUseException"></exception>
-        private static void PortCheckAndShowMessageBox(int port, string portName, PortType portType = PortType.Both)
+        private static void PortCheckAndShowMessageBox(ushort port, string portName, PortType portType = PortType.Both)
         {
             if (PortInUse(port, portType))
             {
diff --git a/Netch/Forms/MainForm.Status.cs b/Netch/Forms/MainForm.Status.cs
index 8c121e08..28eeefb9 100644
--- a/Netch/Forms/MainForm.Status.cs
+++ b/Netch/Forms/MainForm.Status.cs
@@ -183,34 +183,55 @@ namespace Netch.Forms
 
         public static class StatusPortInfoText
         {
-            public static int Socks5Port = 0;
-            public static int HttpPort = 0;
-            public static bool ShareLan = false;
+            private static ushort? _socks5Port;
+            private static ushort? _httpPort;
+            private static bool? _shareLan;
+
+            public static bool ShareLan
+            {
+                set => _shareLan = value;
+            }
+
+            public static ushort HttpPort
+            {
+                set => _httpPort = value;
+            }
+
+            public static ushort Socks5Port
+            {
+                set => _socks5Port = value;
+            }
 
             public static string Value
             {
                 get
                 {
-                    if (Socks5Port == 0 && HttpPort == 0)
+                    if (_socks5Port == null && _httpPort == null)
                         return string.Empty;
 
                     var text = new StringBuilder();
-                    if (ShareLan)
+                    if (_shareLan == true)
                         text.Append(i18N.Translate("Allow other Devices to connect") + " ");
 
-                    if (Socks5Port != 0)
-                        text.Append($"Socks5 {i18N.Translate("Local Port", ": ")}{Socks5Port}");
+                    if (_socks5Port != null)
+                        text.Append($"Socks5 {i18N.Translate("Local Port", ": ")}{_socks5Port}");
 
-                    if (HttpPort != 0)
+                    if (_httpPort != null)
                     {
-                        if (Socks5Port != 0)
+                        if (_socks5Port != null)
                             text.Append(" | ");
-                        text.Append($"HTTP {i18N.Translate("Local Port", ": ")}{HttpPort}");
+                        text.Append($"HTTP {i18N.Translate("Local Port", ": ")}{_httpPort}");
                     }
 
                     return $" ({text})";
                 }
             }
+
+            public static void Reset()
+            {
+                _httpPort = _socks5Port = null;
+                _shareLan = null;
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/Netch/Forms/SettingForm.cs b/Netch/Forms/SettingForm.cs
index ddf50b8e..84cbe5bc 100644
--- a/Netch/Forms/SettingForm.cs
+++ b/Netch/Forms/SettingForm.cs
@@ -132,20 +132,17 @@ namespace Netch.Forms
 
             #region Port
 
-            int socks5LocalPort;
-            int httpLocalPort;
-            int redirectorTCPPort;
+            ushort socks5LocalPort;
+            ushort httpLocalPort;
+            ushort redirectorTCPPort;
             try
             {
-                socks5LocalPort = int.Parse(Socks5PortTextBox.Text);
-                httpLocalPort = int.Parse(HTTPPortTextBox.Text);
-                redirectorTCPPort = int.Parse(RedirectorTextBox.Text);
+                socks5LocalPort = ushort.Parse(Socks5PortTextBox.Text);
+                httpLocalPort = ushort.Parse(HTTPPortTextBox.Text);
+                redirectorTCPPort = ushort.Parse(RedirectorTextBox.Text);
 
-                static void CheckPort(string portName, int port, int originPort, PortType portType = PortType.Both)
+                static void CheckPort(string portName, ushort port, ushort originPort, PortType portType = PortType.Both)
                 {
-                    if (port <= 0 || port > 65536)
-                        throw new FormatException();
-
                     if (port == originPort)
                         return;
 
diff --git a/Netch/Models/Setting.cs b/Netch/Models/Setting.cs
index c760e47c..60735ef3 100644
--- a/Netch/Models/Setting.cs
+++ b/Netch/Models/Setting.cs
@@ -116,22 +116,22 @@ namespace Netch.Models
         /// <summary>
         ///		HTTP 本地端口
         /// </summary>
-        public int HTTPLocalPort = 2802;
+        public ushort HTTPLocalPort = 2802;
 
         /// <summary>
         ///		Socks5 本地端口
         /// </summary>
-        public int Socks5LocalPort = 2801;
+        public ushort Socks5LocalPort = 2801;
 
         /// <summary>
         ///		Redirector TCP 占用端口
         /// </summary>
-        public int RedirectorTCPPort = 3901;
+        public ushort RedirectorTCPPort = 3901;
 
         /// <summary>
         ///		UDP Socket 占用端口
         /// </summary>
-        public int UDPSocketPort = 18291;
+        public ushort UDPSocketPort = 18291;
 
         /// <summary>
         ///		HTTP 和 Socks5 本地代理地址
diff --git a/Netch/Servers/Shadowsocks/SSController.cs b/Netch/Servers/Shadowsocks/SSController.cs
index 259bb44b..c9031f61 100644
--- a/Netch/Servers/Shadowsocks/SSController.cs
+++ b/Netch/Servers/Shadowsocks/SSController.cs
@@ -11,7 +11,7 @@ namespace Netch.Servers.Shadowsocks
         public override string Name { get; protected set; } = "Shadowsocks";
         public override string MainFile { get; protected set; } = "Shadowsocks.exe";
 
-        public int? Socks5LocalPort { get; set; }
+        public ushort? Socks5LocalPort { get; set; }
         public string LocalAddress { get; set; }
 
         private Mode _savedMode;
diff --git a/Netch/Servers/ShadowsocksR/SSRController.cs b/Netch/Servers/ShadowsocksR/SSRController.cs
index beb69437..47f2cf15 100644
--- a/Netch/Servers/ShadowsocksR/SSRController.cs
+++ b/Netch/Servers/ShadowsocksR/SSRController.cs
@@ -11,7 +11,7 @@ namespace Netch.Servers.ShadowsocksR
 
         public override string Name { get; protected set; } = "ShadowsocksR";
 
-        public int? Socks5LocalPort { get; set; }
+        public ushort? Socks5LocalPort { get; set; }
         public string LocalAddress { get; set; }
 
         public bool Start(Server s, Mode mode)
diff --git a/Netch/Servers/Socks5/S5Controller.cs b/Netch/Servers/Socks5/S5Controller.cs
index 44ce714f..b4a67f82 100644
--- a/Netch/Servers/Socks5/S5Controller.cs
+++ b/Netch/Servers/Socks5/S5Controller.cs
@@ -33,7 +33,7 @@ namespace Netch.Servers.Socks5
                 StopInstance();
         }
 
-        public int? Socks5LocalPort { get; set; }
+        public ushort? Socks5LocalPort { get; set; }
 
         public string LocalAddress { get; set; }
     }
diff --git a/Netch/Servers/Trojan/TrojanController.cs b/Netch/Servers/Trojan/TrojanController.cs
index da256960..2ea13c4c 100644
--- a/Netch/Servers/Trojan/TrojanController.cs
+++ b/Netch/Servers/Trojan/TrojanController.cs
@@ -18,7 +18,7 @@ namespace Netch.Servers.Trojan
 
         public override string MainFile { get; protected set; } = "Trojan.exe";
         public override string Name { get; protected set; } = "Trojan";
-        public int? Socks5LocalPort { get; set; }
+        public ushort? Socks5LocalPort { get; set; }
         public string LocalAddress { get; set; }
 
 
diff --git a/Netch/Servers/VLESS/VLESSController.cs b/Netch/Servers/VLESS/VLESSController.cs
index ad4cfdfc..49782e08 100644
--- a/Netch/Servers/VLESS/VLESSController.cs
+++ b/Netch/Servers/VLESS/VLESSController.cs
@@ -10,7 +10,7 @@ namespace Netch.Servers.VLESS
         public override string Name { get; protected set; } = "VLESS";
         public override string MainFile { get; protected set; } = "v2ray.exe";
 
-        public int? Socks5LocalPort { get; set; }
+        public ushort? Socks5LocalPort { get; set; }
 
         public string LocalAddress { get; set; }
 
diff --git a/Netch/Servers/VMess/VMessController.cs b/Netch/Servers/VMess/VMessController.cs
index 8eef3909..ba1773f9 100644
--- a/Netch/Servers/VMess/VMessController.cs
+++ b/Netch/Servers/VMess/VMessController.cs
@@ -15,7 +15,7 @@ namespace Netch.Servers.VMess
 
         public override string Name { get; protected set; } = "V2Ray";
         public override string MainFile { get; protected set; } = "v2ray.exe";
-        public int? Socks5LocalPort { get; set; }
+        public ushort? Socks5LocalPort { get; set; }
         public string LocalAddress { get; set; }
 
 
diff --git a/Netch/Utils/PortHelper.cs b/Netch/Utils/PortHelper.cs
index d718e856..f24c35c6 100644
--- a/Netch/Utils/PortHelper.cs
+++ b/Netch/Utils/PortHelper.cs
@@ -8,8 +8,8 @@ namespace Netch.Utils
 {
     public static class PortHelper
     {
-        private static readonly List<int[]> TCPExcludedRanges = new List<int[]>();
-        private static readonly List<int[]> UDPExcludedRanges = new List<int[]>();
+        private static readonly List<ushort[]> TCPExcludedRanges = new List<ushort[]>();
+        private static readonly List<ushort[]> UDPExcludedRanges = new List<ushort[]>();
 
         static PortHelper()
         {
@@ -24,7 +24,7 @@ namespace Netch.Utils
             }
         }
 
-        private static void GetExcludedPortRange(PortType portType, ref List<int[]> targetList)
+        private static void GetExcludedPortRange(PortType portType, ref List<ushort[]> targetList)
         {
             var lines = new List<string>();
             var process = new Process
@@ -63,9 +63,9 @@ namespace Netch.Utils
 
                     var value = line.Trim().Split(' ').Where(s => s != string.Empty);
 
-                    var port = 0;
+                    ushort port = 0;
                     var _ = (from s1 in value
-                        where int.TryParse(s1, out port)
+                        where ushort.TryParse(s1, out port)
                         select port).ToArray();
 
                     targetList.Add(_);
@@ -80,7 +80,7 @@ namespace Netch.Utils
         /// <param name="type">端口类型</param>
         /// <returns>是否是保留端口</returns>
         /// <exception cref="ArgumentOutOfRangeException"></exception>
-        private static bool IsPortExcluded(int port, PortType type)
+        private static bool IsPortExcluded(ushort port, PortType type)
         {
             return type switch
             {
@@ -97,7 +97,7 @@ namespace Netch.Utils
         /// <param name="port">端口</param>
         /// <param name="type">检查端口类型</param>
         /// <returns>是否被占用</returns>
-        public static bool PortInUse(int port, PortType type = PortType.Both)
+        public static bool PortInUse(ushort port, PortType type = PortType.Both)
         {
             var netInfo = IPGlobalProperties.GetIPGlobalProperties();
             var isTcpUsed = type != PortType.UDP &&
@@ -111,11 +111,12 @@ namespace Netch.Utils
             return isPortExcluded && (isTcpUsed || isUdpUsed);
         }
 
-        public static int GetAvailablePort()
+        public static ushort GetAvailablePort()
         {
-            for (var i = 0; i < 55535; i++)
+            var random = new Random();
+            for (ushort i = 0; i < 55535; i++)
             {
-                var p = new Random().Next(10000, 65535);
+                var p = (ushort) random.Next(10000, 65535);
                 if (!PortInUse(p))
                 {
                     return p;
@@ -128,7 +129,7 @@ namespace Netch.Utils
         /// <summary>
         ///     记录Netch使用的端口
         /// </summary>
-        public static readonly List<int> UsingPorts = new List<int>();
+        public static readonly List<ushort> UsingPorts = new List<ushort>();
     }
 
     /// <summary>