I have a question that is more methodical rather than purely technical, I hope tha is OK. My servers have been hit with a virus two months after we purchased many licenses for Norton AV.
(never installed it)
The previous version was running with outdated definitions prior to this. Since being hit by the new virus, we have applied the new AV software and definitions. NAV uses 'Live Update' to go out over the net and download newer virus definitions on a regular basis.
Now, coming from an IP network/ router background, my first inclination is cut these servers off from the internet, and allow only DNS & some higher level custom TCP ports through. I could possibly open a hole in my FW for LiveUpdate, or I could delegate the download function to a DMZish server from which the updates can be periodically pulled. (Or can't I?- does NAV support this?)
I know the dangers of treating every problem like it was a nail when the only tool you own is a hammer. Is this an appropriate network transport issue? What is the industry prevalent method of insulating servers from the internet and updating/verifying virus definitions?