Nagios Support Forum

Just to provide some closure to this issue, the problem seems to stem from DNS not being available. So something about the way sendmail delivers messages locally even with host entires in /etc/hosts it still queries DNS anyways, if it can't reach it nothing goes in the mailq and silently fails. In m...

I haven't files a bug report since I thought I should make sure it was really a bug or if someone else has the same problem. Here is the output from maillog and what happens when I run the whole command from linux: sendmail[17867]: rBRKZGBl017867: from=nagios, size=0, class=0, nrcpts=0, relay=nagios...

I think I might have found a bug in nagios, this is version 3.4.1 however. What happens is that when a host goes down, the notification tries to send but times out, yet the host UP notifications always work so I can't see it being a sendmail problem. I've tried many things and still can't find the p...