SSL bug

            //STEP 1: open a socket and network streams
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            socket.Connect("localhost", 1433);

            var tcpStream = new NetworkStream(socket, true);
            var sslOverTdsStream = new SslOverTdsStream(tcpStream); //simple Stream wrapper - https://github.com/dotnet/corefx/blob/master/src/System.Data.SqlClient/src/System/Data/SqlClient/SNI/SslOverTdsStream.cs
            var sslStream = new SslStream(sslOverTdsStream, leaveInnerStreamOpen: true, userCertificateValidationCallback: new RemoteCertificateValidationCallback(ValidateServerCertificate), userCertificateSelectionCallback: null);

            //STEP 2: send & receive data via tcpStream (not ssl)
            tcpStream.Write...
            tcpStream.Read...

            //STEP 3: send & receive data via sslStream
            sslStream.AuthenticateAsClientAsync(_targetServer);
            sslOverTdsStream.FinishHandshake();
            sslOverTdsStream.Write...
            sslOverTdsStream.Read...

            //STEP 4: Dipose sslStream & sslOverTdsStream (it should not dispose tcpStream);
            sslOverTdsStream.Dispose();
            sslStream.Dispose();

            //STEP 5: Send & receive data via tcpStream 
            tcpStream.Write...
            tcpStream.Read...  -- hangs here. but if comment sslStream.Dispose() -- it won't hang.
            //Same code works in corefx on both macOS and Windows