Funny you should mention a firewall, a friend who works IT at the county shared how they had to unplug the 911 vendor’s systems from theirs (killing 911 service for the county of course) because they hadn’t updated their firewall for years. They informed the vendor “since you haven’t done your due diligence in updating anything, we are unplugging this. You can figure out the legal ramifications for yourself” so the vendor then flew someone out the next day to update it all