Ensure the server computer itself hasn’t gone to sleep, restarted for updates, or disconnected from the local router. 5. Configure Windows Firewall and Antivirus

Install the fresh driver by typing: haspdinst.exe -i and pressing Enter. Restart your computer and try launching Mastercam 2021.

With the shift toward software-based (digital) licenses, the error often occurs because the license wasn't properly "checked out" or activated [12].