I am in the process of setting up our Nagios server and have a little problem with servers that are inside the DMZ.
Our Nagios server is outside the DMZ and I want to monitor those servers inside the DMZ. We allowed our Nagios server access to port 12489. When we did that it no longer could make contact with the hosts inside of the DMZ BUT, it could monitor services on those computers even though the host appeared down.
Do I need to get some more ports opened up?
We tried 7, 8, 445 and it still does not work. I also tried pinging from the actual Nagios server to those inside of the DMZ and that does not work either.