Mountain lion messages cannot sign in

Just updated my Mac Pro to Mountain Lion. The messages app begins to walk me through setup, but when I try to log in using my apple ID, it says "Could not sign in. Please check your network connection and try again."
I have tried my apple ID, my me.com email address, AND my icloud.com address and I get the same message each time. There is no network problem on this machine. I connect to the internet and to the other devices on my home network just fine.

Hi,
Try this update
http://support.apple.com/kb/DL1611
10:34 PM Sunday; November 25, 2012
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

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Mountain lion messages cannot sign in

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