SEP (Symantec Endpoint Protection) for Mac is displaying popups requesting permission for application traffic.
Various popups asking whether to block or allow traffic for different applications on the Mac: "Do you want to allow this connection?"
These notices are for an application control feature that is not yet implemented and there are no related user-configurable settings in SEP. This traffic should automatically be allowed and governed by SEP firewall settings. This issue is fixed in SEP 14.3 RU1 (14.3.3385) for Mac
Upgrade to SEP 14.3 RU1 (14.3.3385) or newer. See Upgrading and Migrating to the Latest Release of Symantec Endpoint Protection (SEP)