Did you tell him to restart everything and then call his DSL people?
Heh...not in so many words, but basically.
He's got a router set up, and though he or his room mate can connect, if one person is connected, the other person gets a time out error when they try to connect.
He hadn't looked through any of the setup instructions for DSL, so there may even be something in the paperwork they got, I dunno. But I still feel wretched that I didn't have answers.