You configured Exceptions policy on Symanetc Endpoint Protection Manager (SEPM) or configured local Exceptions on Symantec Endpoint Protection (SEP) client GUI but exceptions are not working as expected.
Symantec Endpoint Foundation (SEF) definition is missing on SEP client.
Configure SEPM and SEP client to download Symantec Endpoint Foundation (SEF) definition.
In LiveUpdate Administrator, SEF definition is called as "SymPlatform Definitions".