Nagios

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there seem to be issues with check_procs on solaris, pst3 and config.h - #define PS_COMMAND are the keywords here

FAQ

Hosts or services simply not showing up

Check if you have more than one instances of nagios running

Debian complaining about rights on nagios.cmd

dpkg-statoverride --update --add nagios www-data 2710 /var/lib/nagios2/rw
dpkg-statoverride --update --add nagios nagios 751 /var/lib/nagios2

NRPE: Unable to read output

This could mean the plugins are not installed ( yes, on debian nrpe comes without those :)

CHECK_NRPE: Error receiving data from daemon.

Possibly SSL version mismatch, try check_nrpe -n

(No output returned from plugin)

Most likely ssl mismatch again. It can also mean you're using debian, where check_nrpe!check_something fails, since it expects one more argument. call 'check_nrpe_1arg' instead.

Error: Could not stat() command file '/var/lib/nagios3/rw/nagios.cmd'!

That's apache missing read rights to the path.