Socket error: An existing connection was forcibly closed by the remote host

I am trying to send data from unity to matlab for further processing. I am using matlab as server and unity as a client. when I run the program no data is sent from unity and i get the following error Socket error: System.IO.IOException: Unable to write data to the transport connection: An existing connection was forcibly closed by the remote host. . ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host. I tried disabling the firewall but no effect.