The Xbox couldn't determine the DNS servers, but with a little 'blowing into the vents' (and a call to BT), I managed to get it all sorted.

I'm so glad that 7 year olds with Brute shots or plasma rifles can now kick my ass, alllllll the way in San Diego or whatnot.

Cheers!

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When Bucks Fizz’s tour bus crashed they all survived. When Metallica's bus crashed Cliff Burton died. Why?