The Print Spooler is the Windows service that manages all print jobs and port communications. If it is stuck or glitched, the MF Port Monitor cannot be registered. Press Windows Key + R , type services.msc , and hit Enter. Locate in the list. Right-click it and select Stop . Wait a few seconds, then right-click and select Start .
Set the "Startup type" to to prevent future issues. 3. Disable Firewalls Temporarily could not install canon mf port monitor exclusive