Nagios Support Forum

My nagios installation seems to toggle between showing all status monitored via NRPE as OK and UNKNOWN with the following error message: CHECK_NRPE: Receive header underflow - only -1 bytes received (4 expected) For example, all services go to UNKNOWN at ~5:30 and return to OK at 7:00, then again to...

I have a small home network with a number of (virtual) Ubuntu machines to monitor with nagios and recently switched to Nagios 4. Since then, nrpe appears to be unstable. My network does not use SSL and I have no intention to introduce it at the moment. As a consequence, I configured all nrpe service...