This is due to Network Application Monitoring being enabled:
This is a known issue in this version so you need to upgrade:
Endpoint Protection 12.1 SBE enables Network Application Monitoring without ability to modify feature settings.
http://www.symantec.com/docs/TECH167268
Workaround: This issue only affects the pre created groups (My Company; Laptops and Desktops; Servers) and does not affect user-created groups. If migration is not possible at this time, move affected clients to user-created groups.