Symantec Endpoint Protection (SEP) 14.2 RU1 MP1 clients attempt to connect to Symantec Endpoint Protection Manager (SEPM) with System proxy. If this fails, the SEP client does not failover to direct connection as it should.
SEP 14.2 RU1 MP1
This issue is fixed in Symantec Endpoint Protection 14.2 RU2. For information on how to obtain the latest build of Symantec Endpoint Protection, see Download the latest version of Symantec software here.