11-16-2015
04:06 PM
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11-16-2015
04:06 PM
Hi @Anonymous,
Welcome to the community!
Sorry to hear about the issue. As you might already know, Windows 10 is not officially supported by AutoCAD 2013. I would recommend checking what updates were recently performed on your computer. It appears you are having an issue communicating with the license server, try giving this a shot.

Matt DiMichele
Autodesk Product Blogs | @ADSKCommunity Twitter
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Please Accept As Solution if this resolves your issue, to help others benefit and locate it.