The client ned the IP of the server.

back in the days with Win98, and A5, I never had a problem just using -cl
on a single machine (and also never a problem to connect to a server running
on a computer over a simle Modem). Somehow on Vista, with routers and firewalls, I have much more problems.

Anyhow, try "-ip localhost", as this should give you the ip of the local computer