If Wireless, are you using a white or black external adapter, or an internal (Xbox 360S) adapter?
Things you have tried:
Is UPnP Enabled? Yes/no/Unknown
Do you have a NAT error? If so, what is your NAT?
Any Error Codes you encounter:
Who is your ISP(Internet Service Provider)?
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.)
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