Sep not updating
Under normal conditions, Symantec recommends Certified definitions for routine use on enterprise Endpoint systems.If you are unsure as to which definitions set you should use, please contact Symantec Support for guidance.
The SEPM shows old virus definitions in "Admin Server Activity logs may provide details on the nature of the failure.
Once these definitions pass the full QA process, they are posted as Certified Live Update definitions.
Please note that using Rapid Release definitions regularly, on the endpoint instead of Certified definitions is not encouraged by Symantec.
These Intelligent Updater files do not contain the required content needed by a Symantec Endpoint Protection Manager.
By default, SEP will use the operating system's proxy settings.