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I have the usual problem with IP not found. However all the help on the forum doesn't help cause I have a small buissnes server which screwes everything up. It is brand new and EUII MP worked before I got it. I have had router all the time though
Do you have a new router/firewall? If yes, you need to check if you have opened/forwarded the correct ports.
www.portforward.com describes this for a lot of routers (under directX 7).
Ports ranged from 2300-2400 need to be opened by the firewall and port 2300 needs to be forwarded by the router.