If you're typing 5 digits then it's a different problem (the problem here was typing only 4) - so better to start a new thread really.
That said - what error do you get? What have you tried so far?
Do you have any sites set up on the server yet? If so, can you access those OK? If so, have you tried yoursite.com:22222
Do you have a firewall, and is port 22222 open?