Originally posted by crono_logical
I have no idea what DMZ is
DeMilitarized Zone(geez, remember, from "Good Morning Vietnam")

Anyway, yeah, if you "just" gave your computer a new ip address, chances are that somewhere something is looking for the old address. Like Unne said, start from the beginning, but rather than redo everything, check all of your setups where the ip addresses could be in a systematic order.