http//1.1 connect proxy

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C#

error:

HTTP/1.1 502 Proxy Error ( The specified Secure Sockets Layer (SSL) port is not allowed. ISA Server is not configured to allow SSL requests from this port. Most Web browsers use port 443 for SSL requests. )
code:

private Socket ConnectByHTTP(string v_sHost, int v_iPort, string v_sProxyHost, int v_iProxyPort, string v_sUserName, string v_sPassword)
        {
            Socket mSocket = DirectConnect(v_sProxyHost, v_iProxyPort); 
            if (mSocket.Connected)
            {
                byte[] end = new byte[] { 13, 10 };
                string sEnd = Encoding.Default.GetString(end);

                byte[] user = Encoding.Default.GetBytes(v_sUserName + ":" + v_sPassword);
                string sUser = Convert.ToBase64String(user, 0, user.Length, Base64FormattingOptions.InsertLineBreaks);
               // v_iPort = 443;
                String msg = "CONNECT" + " " + v_sHost + ":" + v_iPort.ToString() + " " + "HTTP/1.1" + sEnd
                    //  + "Host: " + v_sProxyHost + ":" + v_iProxyPort.ToString() + sEnd
                    //+ "Authorization: Basic " + sUser + sEnd + sEnd;
                    //  + "Proxy-Authorization: Basic " + sUser + sEnd + sEnd;
                + "User-Agent: MyApp/0.1" + sEnd + sEnd;

                byte[] buff = Encoding.Default.GetBytes(msg);
                mSocket.Send(buff, buff.Length, SocketFlags.None);

                buff = new byte[4096];
                mSocket.Receive(buff, 4096, SocketFlags.None);

                string str = Encoding.Default.GetString(buff);

                if (str.StartsWith("HTTP") == true && str.IndexOf("200") > 0)
                    return mSocket;
                else
                    return null;
            }
            else
                return null;            
        }