IF you cannot loggin past your character selection Do this easy fix. It worked for both my Xboxs having this issue. No i didnt figure this out I read this on this forum though i cannot remember the gamertag that did it. Thanks to the person who figured this Out and did his homework!
-Per an OpenDNS Support article I found, I manually changed my system's primary and secondary DNS address' to 208.67.222.222 and 208.67.220.220 respectively and that seems to have fixed the issue!
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You are legend!