Also as requested from the other threads:
What Country/State/Province do you live in? NC, USA
Modem brand & model number: Uverse 2Wire
Router brand & model number: Netgear WNDR4000
If Wireless, are you using a white or black external adapter, or an internal (Xbox 360S) adapter? Wired
Things you have tried: See above
Is UPnP Enabled? Yes
Do you have a NAT error? No
Any Error Codes you encounter: 80072741
Who is your ISP(Internet Service Provider)? ATT Uverse
After you run "Test Xbox LIVE connection" press “Y” for "More Info”. In the pop-up that appears, what are the following values, if shown? (If a value below does not appear for you, just leave it blank.)
W: 0000- 000B
X: 0000 - F001
Y: 20A8 - 4840
Z: 0000 - 0000
ID: FFFF - FFFF
L: 0015 - 10F0
Q: 8007 - 0435
T: Wired
A: 192.168.1.166/255.255.255.0
G: 192.168.1.1
D: 192.168.1.1/0.0.0.0