Nagios Support Forum

i have the same issue:

Monitor Engine Process: No data
Monitor Engine Event Queue: Scheduled Events Over Time: Error: No output from backend!


Did anyone ever solve this? For me it started after the most recent upgrade.

Yes, ping only; there was a different issue with the host check, but that seemed to be a syntax difference which was solved by just forcing the configs to be rewritten. No, I only altered the command now to add the -4 flag. Either way, that works for now and I'll remove and re-add the existing hosts...

It should not try ipv6 first unless it is available. I bet your server is configured to support ipv6 and for some reason the plugin tries that first even though you do not have a valid interface up running ipv6. I just tested on one of my test boxes and didn't experience the issue, so this may be u...

Thanks, yes, I did that, but there's no IPv6 on the server, nor any quad A for the zone, so why is it trying IPv6? It shouldn't be doing that.

Either way, it's working now.

We were able to upgrade to NagiosXI 2014R1.3, all works fine for existing hosts and services, but if I edit a service or add a new host with services, then the services keeps flapping: 2014-07-19 09:36:47 XXX UP HARD 1 of 5 HTTP OK: HTTP/1.1 200 OK - 79826 bytes in 0.046 second response time 2014-07...