Tool: Symantec Endpoint Protection Manager 12.1
I have a network of a few PC. I want to protect this from alien computers by using a firewall rule that only allows users in a host list. Problem is that the applications the system uses for internal comunication utilizes multicast, and the firewall rule only specifies source/destination or local/remote combinations.
Logically, the firewall rule ought to allow my applications, but it does not. I have a debug tool that can send/receive to my applications. This runs on java, and I had to make a rule that allowed that application in order to make that work. Now my applications are blocked. Unless I run the debug tool as well, in which case SEP allows suddenly allows the applications to communicate freely.
I also have problems with Remote Desktop being blocked. The other computers vanish from network list, and ping only works when using IP adress rather than PC name, which functions fine when SEP is disabled.