Windows Server 2008 activation trouble: solved!

I recently installed a Windows Server 2008 Standard box for testing, and everything ran succesfully during install. I entered a product key from MSDN, but didn't bother to activate just yet.

After running the system succesfully for several days, I though it would be a good time to activate. But strangely enough, I got an activation error with data "Code: 0x8007232B, Description: DNS name does not exists."

Ahem, what did I do wrong? Installation media from MSDN, code from MSDN. Did I foget something? No, I double-checked the key, the media, and both were correct/valid. What to do, since activation still didn't work. Solution: change the product key, but change it back to what is was before! To do so, I opened the properties window of Computer (right-click in Start menu; this is the same as going to Control Panel and opening the System applet or by pressing Win+Break), and then clicked the Change Product Key link, re-entered the original key, and activated. Problem solved: all was okay this time!

By the way, to run the Windows Activation quickly, simply run "SLUI.EXE" from the System32 directory. And to change the product key, go to Computer Properties.