A Symantec Endpoint Protection (SEP) 14 scan does not complete, and runs for several days or longer. The scan is configured with "Best Application Performance" Tuning settings. Also, virus definitions may not appear to update, and stopping the SEP Master Service by executing smc -stop
fails.
Symantec Endpoint Protection 14.0.0 or 14.0 MP1
This was an issue that has been fixed in Symantec Endpoint Protection 14.0 MP2 and higher.
For information on how to obtain the latest build of Symantec Endpoint Protection, please see Download the latest version of Symantec Endpoint Protection.