Endpoint Protection 14.3 RU3 for Mac fails to load its system extension


Article ID: 233029


Updated On:


Endpoint Protection


Symantec Endpoint Protection (SEP) 14.3 RU3 for Mac may fail to load its system extension; the installation appears to finish OK but the SEP client GUI prompts for approval of unfinished setup tasks:

"Setup Incomplete
  You haven't finished Setup and your
  computer is not protected."

And there are no pending approvals at bottom of the macOS Security & Privacy settings General tab.

The list of installed system extensions (command line "systemextensionsctl list") does not include com.broadcom.mes.systemextension; normally this list will display com.broadcom.mes.systemextension with status of "[activated enabled]" or "[activated waiting for user]" 

Running "sudo /Applications/Symantec\ Endpoint\ Protection.app/Contents/MacOS/Symantec\ Endpoint\ Protection -activateSystemExtension" will result in output like:

2022-01-25 11:15:37.455 Symantec Endpoint Protection[1643:12674] call activateSystemExtension
2022-01-25 11:15:37.473 Symantec Endpoint Protection[1643:12674] Failed: error:Error Domain=OSSystemExtensionErrorDomain Code=8 "(null)"

The normal response should be "Succeed" or "Failed: activation request requires user approval"


This will be caused by blocked communications with Apple hosts that are used for app notarization and validation checks.


As a work-around, install SEP 14.3 RU2 for Mac first then upgrade to 14.3 RU3. An upgrade to RU3 doesn't require an app validation check with Apple servers. To resolve this otherwise, make sure that the devices on your network have direct access to the hosts described in Apple's support article Use Apple products on enterprise networks and un/re-install SEP.  When using the Symantec WSS Agent for Mac, for example, adjusting WSS to bypass api.apple-cloudkit.com is enough to eliminate this symptom. Otherwise, consult with Apple support and reference that technical article to determine what is necessary to unblock the necessary communications.