Seems like that server wants you to send a vbCrLf after everything you send it, so try that. If that doesn't work, try vbCrLf & vbCrLf

You will need to find out the protocol it uses so you can make your client program communicate with it. You would have to contact the developer of the server to find that out.

If there is another client program already made, you can use a port monitor/packet sniffer to watch what data is being sent/received from client to server and learn the protocol that way.