Occasionally, and for no particular reason, my computer will no longer establish Remote Desktop connections to any computer. When trying to connect, I get the error message “The remote computer disconnected the session because of an error in the licensing protocol. Please try connecting to the remote computer again or contact your server administrator.” The issue seems to stem from a corrupt registry key, so the best way to resolve the problem is by removing that key from the registry and allowing Remote Desktop to recreate it. The fix is basically the same for Windows XP through Windows 7, though Vista/7 may require one more step.
1. Log in as an Administrator.
2. start regedit
3. delete key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSLicensing
4. Reboot your computer.
5. Start ( “Run as Administrator” ) Remote Desktop.