diff --git a/shadowsocks-csharp/Controller/Service/Sip003Plugin.cs b/shadowsocks-csharp/Controller/Service/Sip003Plugin.cs
index e3391ecb..c9173ef4 100644
--- a/shadowsocks-csharp/Controller/Service/Sip003Plugin.cs
+++ b/shadowsocks-csharp/Controller/Service/Sip003Plugin.cs
@@ -43,7 +43,7 @@ namespace Shadowsocks.Controller.Service
             {
                 throw new ArgumentException("Value cannot be null or whitespace.", nameof(serverAddress));
             }
-            if ((ushort)serverPort != serverPort)
+            if (serverPort <= 0 || serverPort > 65535)
             {
                 throw new ArgumentOutOfRangeException("serverPort");
             }
diff --git a/shadowsocks-csharp/Properties/AssemblyInfo.cs b/shadowsocks-csharp/Properties/AssemblyInfo.cs
index 9e24b47d..fa5e0f3b 100755
--- a/shadowsocks-csharp/Properties/AssemblyInfo.cs
+++ b/shadowsocks-csharp/Properties/AssemblyInfo.cs
@@ -11,7 +11,7 @@ using System.Runtime.InteropServices;
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyCompany("")]
 [assembly: AssemblyProduct("Shadowsocks")]
-[assembly: AssemblyCopyright("clowwindy & community 2017")]
+[assembly: AssemblyCopyright("clowwindy & community 2018")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]