Received this error today trying to RDP into a server:
Solution was to delete the registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSLicensing
In Windows Powershell (Run as Admin):
You'll be prompted to confirm the deletion:
The item at HKLM:\SOFTWARE\Microsoft\MSLicensing has children and the Recurse parameter was not specified. If you continue, all
children will be removed with the item. Are you sure you want to continue?
[Y] Yes [A] Yes to All [N] No [L] No to All [S] Suspend [?] Help (default is "Y"):
After this, you need to re-run the Remote Desktop Connection (Run as Admin) to recreate the key.