Problems with XBox Live and AT&T
This problem may have been an isolated one since I don't see many other reports relating to problems with XBox Live and AT&T U-verse. In this consumer's report, we were unable to maintain a wireless connection and frequently received the message "IP Failure". I'm not a techie, but then AT&T could not solve the problem either.
ATT U-verse Won't Kill XBox LiveAft
We haven't experienced any problems with XBox Live after returning to Bright House.