I have an error (Return code of 127 is out of bounds - plugin may be missing) in the Status Information column for all service checks and No Output under Host details.
I can run checks manually, they run well at command line.
It’s most likely that you have a configuration problem.
For example:
In my resource.cfg I have this:
$USER1$=/usr/local/nagios/libexec
In my checkcommands.cfg I have this:
I had a similar problem, but a specific set of steps to reproduce. I could start okay with /etc/init.d/nagios start. No errors reported. I could restart with /etc/init.d/nagios restart. No errors reported. If i tried /etc/init.d/nagios reload - ALL services would report failure with same message as reported in this thread. thoughts? i do not know much about -HUP.