Thanks, with my level of incompetence, I'm sure we can sort these problems out

Hopefully you've sorted that one out, but all I did was load up the program and run it. I didn't make any changes at all. The server starts automatically and I just clicked 'Connect' on the client, and the error appeared. Hopefully the update will resolve that.

As for having two seperate assemblies, this is probably due to my incompetence with VB, but what I was looking to do was to have one program for my server and one for my clients. But I assume what you're saying is, they would both be identical anyway, I just need to set one up as a server, which runs as it does now but doesn't start any clients, and one which only starts the client. I'll tinker around with it once you've uploaded the new code and see if I can sort that without any problems.