This is a known problem with Microsoft terminal server licensing. Apparently this happened due to some corrupted or expired certificates that Microsoft uses for their clearing house. You might get errors about licensing protocol errors when trying to connect or get the 0xc0110011 errors when trying to activate the server again.
Luckily you can fix this problem by deleting the following registry keys (please make a backup beforehand):
- HKLM\Software\Microsoft\TermServLicensing\Certificates
- HKLM\System\CurrentControlSet\services\TermservLicensing\Parameters\Certificates.000
- HKLM\System\CurrentControlSet\services\TermservLicensing\Parameters\Certificates.001
