I just got a new Xbox and I've problems getting onto Xbox live. (Wired connection)
I've reset the router (the box is connected straight to the router), reset the Xbox, manually applied IP settings (automatic assign did work, but the connection only goes as far as the connecting to my network) and the all stuff that appear on the support page.
The error I'm getting is that it can't resolve the DNS server (or something along those lines).
My PS3 works fined (simpy entered my PPPOE details) and my PC can connect to the internet, so it's not my network.
I'm not sure what the deal is - either I'm missing something really basic or something is wrong.