if you have a BT homehub then go to [url=http://www.unofficialguidetolive.co.uk/faqs/56-bt-homehub-strict-nat-tbc]this website[/url] nothing I tried changed my NAT to open until I followed the steps recommended by this site :) basically after trying all the complicated stuff like port fowarding and putting my xbox in a dmz (which is surprisingly tricky with the homehub), I found that simply setting all the I.P.s, gateways and subnet masks and stuff to auto on the xbox, telling the homehub to use the same I.P. address every time for my xbox, and assigning the application "XBconnect" to my xbox's I.P., it mysteriously started working again (go to the website as I cant be bothered to run through it all here) sometimes the simplest solutions are the best :) [Edited on 12.20.2010 6:29 AM PST]