diff --git a/shadowsocks-csharp/Controller/Local.cs b/shadowsocks-csharp/Controller/Local.cs
index ed769215..8bdbd15f 100755
--- a/shadowsocks-csharp/Controller/Local.cs
+++ b/shadowsocks-csharp/Controller/Local.cs
@@ -70,7 +70,7 @@ namespace Shadowsocks.Controller
             {
                 Socket listener = (Socket)ar.AsyncState;
                 Socket conn = listener.EndAccept(ar);
-                conn.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.NoDelay, true);
+                conn.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, true);
 
                 listener.BeginAccept(
                     new AsyncCallback(AcceptCallback),
@@ -103,15 +103,14 @@ namespace Shadowsocks.Controller
         public const int RecvSize = 16384;
         public const int BufferSize = RecvSize + 32;
         // remote receive buffer
-        public byte[] remoteRecvBuffer = new byte[RecvSize];
+        private byte[] remoteRecvBuffer = new byte[RecvSize];
         // remote send buffer
-        public byte[] remoteSendBuffer = new byte[BufferSize];
+        private byte[] remoteSendBuffer = new byte[BufferSize];
         // connection receive buffer
-        public byte[] connetionRecvBuffer = new byte[RecvSize];
+        private byte[] connetionRecvBuffer = new byte[RecvSize];
         // connection send buffer
-        public byte[] connetionSendBuffer = new byte[BufferSize];
+        private byte[] connetionSendBuffer = new byte[BufferSize];
         // Received data string.
-        public StringBuilder sb = new StringBuilder();
 
         private bool connectionShutdown = false;
         private bool remoteShutdown = false;
@@ -134,7 +133,7 @@ namespace Shadowsocks.Controller
 
                 remote = new Socket(ipAddress.AddressFamily,
                     SocketType.Stream, ProtocolType.Tcp);
-                remote.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.NoDelay, true);
+                remote.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, true);
 
                 // Connect to the remote endpoint.
                 remote.BeginConnect(remoteEP,
@@ -238,6 +237,7 @@ namespace Shadowsocks.Controller
                     {
                         // reject socks 4
                         response = new byte[]{ 0, 91 };
+                        Console.WriteLine("socks 5 protocol error");
                     }
                     connection.BeginSend(response, 0, response.Length, 0, new AsyncCallback(HandshakeSendCallback), null);
                 }
@@ -289,6 +289,7 @@ namespace Shadowsocks.Controller
                 }
                 else
                 {
+                    Console.WriteLine("failed to recv data in handshakeReceive2Callback");
                     this.Close();
                 }
             }
diff --git a/shadowsocks-csharp/Program.cs b/shadowsocks-csharp/Program.cs
index 35356d78..2115c77a 100755
--- a/shadowsocks-csharp/Program.cs
+++ b/shadowsocks-csharp/Program.cs
@@ -47,7 +47,9 @@ namespace Shadowsocks
                 }
                 LoadLibrary(dllPath);
 
+#if !DEBUG
                 Logging.OpenLogFile();
+#endif
                 Application.EnableVisualStyles();
                 Application.SetCompatibleTextRenderingDefault(false);
                 ShadowsocksController controller = new ShadowsocksController();
diff --git a/shadowsocks-csharp/shadowsocks-csharp.csproj b/shadowsocks-csharp/shadowsocks-csharp.csproj
index 1ad09bf6..2fa3cf78 100755
--- a/shadowsocks-csharp/shadowsocks-csharp.csproj
+++ b/shadowsocks-csharp/shadowsocks-csharp.csproj
@@ -119,7 +119,9 @@
       <DependentUpon>QRCodeForm.cs</DependentUpon>
     </EmbeddedResource>
     <None Include="app.config" />
-    <None Include="app.manifest" />
+    <None Include="app.manifest">
+      <SubType>Designer</SubType>
+    </None>
     <None Include="Data\polarssl.dll.gz" />
     <None Include="Data\polipo.exe.gz" />
     <None Include="Properties\Settings.settings">