My SEPM is using 12.1.x, I am going to block all unnecessary network port from SEPM to internet, may I know is that only allow port 80 go out should be enough ?
Hi see the below link for ports used by SEP and block any that aren't needed https://support.symantec.com/en_US/article.HOWTO81103.html
See here:
http://www.symantec.com/docs/TECH102059