What Country/State/Province do you live in? United States
Modem brand & model number: Are these two necessary?
Router brand & model number: Only one account is unable to connect, so it's obviously a problem with the account.
If Wireless, are you using a white or black external adapter, or an internal (Xbox 360S) adapter? Not wireless.
Things you have tried: Restarting Xbox, restarting modem.
Is UPnP Enabled? Yes
Do you have a NAT error? If so, what is your NAT? No NAT error
Any Error Codes you encounter: No error codes.
Who is your ISP(Internet Service Provider)? Time Warner
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.)
Further information: I'm only unable to connect to Xbox live with this account, RainingSeagulls. Attempts on all other accounts to access Xbox live have been successful. When I log in with RainingSeagulls, it states that "this xbox is unable to connect to LIVE." However, when I test the connection and it logs everyone out, it does just fine, connecting in no time. The xbox live subscription did expire on 3/27, however, which I believe to be the cause of my problems. Therefore I suspect it's only an account or system problem, not a router or modem connected problem. I would sign up for more Xbox live using the website if I were certain that I would be able to access my account afterwards.
On that string of numbers and letters up there, there were no S and C values. However, there were A and G values if I should post those.