Why can't I sign into messages on OSX Mountain Lion?

I just upgraded to Mountain Lion on OSX and I cannot sign into Messages or FaceTime. I'm getting this message every time:
"The server encountered an error processing registration. Please try again later."
Any advice or anyone else experiencing this?

Hi again,
The Host File was the "fix" to the issue before OS X 10.8.2 came out (this updates Messages to version 7.0.1)
Editing the Hosts file can be done by some apps but is normally a deliberate act to stop some Apps "Phoning Home".
It does not sound like this is something you have done.
It is worth learning how to look at the file though.
EDIT.
I am presuming you have checked Date and Time (including Zone) settings
9:08 PM Sunday; January 13, 2013
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously
Message was edited by: Ralph Johns (UK)

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Why can't I sign into messages on OSX Mountain Lion?

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