After applying update 1809 on Windows 10 with Symantec Endpoint Protection (SEP) 14.2.1031.0100 receiving Error "Security Center failed to validate caller with error xxxx." in Windows Event Viewer, every time SEP service is being restarted.
Windows Event Viewer:
Event 17: Security Center failed to validate caller with error xxx
This event is getting logged because SEP version used is not compliant with Microsoft AM PPL feature.
This issue is fixed in Symantec Endpoint Protection 14.2 RU1. For information on how to obtain the latest build of Symantec Endpoint Protection, see Download the latest version of Symantec Endpoint Protection.