Error 0x8007007f: A problem is preventing Windows from accurately checking the license for this computer

I got this error, when I tried to log in to one of my Domain Controllers this morning. It is a Windows 2003 x64 server. I had remotely applied SP2 and some other patches.
 
Looking up this error, I found references to the fact that SP2 may have been installed, but the computer had not been rebooted. Duh!
 
Rebooted the server, and all was well.

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