SEP 14.3 RU3 introduced an additional feature (Total Cloud Protection) which needs to be either disabled, or an additional set of definitions needs to be configured, in order to update definitions from LiveUpdate Administrator.
SEP 14.3 RU3 and above
Starting SEP 14.3 RU3 an additional feature was introduced (Total Cloud Protection) which needs to be either disabled, or an additional set of definitions needs to be configured, in order to update definitions from LiveUpdate Administrator.
Solution 1:
To disable Total Cloud Protection, please:
Solution 2:
To configure the additional set of definitions, please make sure to download and distribute the following content: Client - SymPlatform Definitions TCP (Linux)
Further information about Total Cloud Protection can be found in the documentation.
Related Article: Use the LiveUpdate Administrator 2.x to download updates for Symantec Endpoint Protection for Linux. (broadcom.com)