Nagios Support Forum

Not much to start with here I know..

I am interested primarily in devices that have volatile memory - e.g network switches, so I setup a building that has 3 IDF's and all seam switch types, one of the idf's connects fine to nagioslog the other two do not, same switch types, same firmware version, same settings,

how do we start figuring out why?

What port are they sending data to on the NLS? Do you see data coming in when running a tcpdump:

yum -y install tcpdump
tcpdump -i any port <PORTNUM> and host <DEVICEIP>

?

Does the traffic go through the same devices? A firewall some where may prevent traffic from some devices but allow others.