Community Tip - Have a PTC product question you need answered fast? Chances are someone has asked it before. Learn about the community search. X
As it indicates the server may be down.
It could be simply the license manager isn't running on the server after a restart. I'd start with the server, and use the license diagnostics. Also check your license file to be sure it's using the right server name if for some reason something change via hardware or something.
Anyways a few blanks you need to fill in to help more.