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UK players may be experiencing problems signing in to Xbox Live. Microsoft is aware of the issue with the online service and has apologised to gamers having trouble logging in. A message on the XBL status page says "users may experience difficulties signing into Xbox Live from an Xbox console" and "signing into Xbox Live from Xbox.com". Microsoft is currently running a closed beta for the 2012 Xbox Live update, which will introduce Internet Explorer for Xbox 360, among other features.
~ Source