Well, given this:
https://www.cisa.gov/uscert/ics/advisories/icsa-21-243-02
It seemed like it might be time to start a thread dedicated to FSAC. I've hardly played with this so far. On the surface, it looks like just a whitelist of IP addresses you can set up from the pendant, but it seems like there's some more fine-grained control via some of the system variables?
Anyone with deep-dive experience in this area care to share their hard-won wisdom? It looks like we'll all have to start "hardening" our Fanucs...