<div class="gmail_quote">On Fri, Apr 17, 2009 at 11:39 PM, Brian O'Mahony <<a href="mailto:brian.omahony@curamsoftware.com">brian.omahony@curamsoftware.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div link="blue" vlink="purple" lang="EN-US"> <div> There seems to be a lot of documentation on Nagios all over the web. I must say im impressed with it, even though im still installing it. Basically I have the server set up and monitoring itself, and I have one remote machine, which I have set up 6 tests on just for testing. I have the nagios plugins and nrpe installed and everything is working in that regard. If I run the check_nrpe command with any of the base remote commands in the /etc/nagios/nrpe.cfg file, I get the output to my screen. [nagios@mido ~]$ /usr/lib/nagios/plugins/check_nrpe -H 172.16.165.248 -c check_root_disk DISK OK - free space: / 4460 MB (95% inode=98%);| /=208MB;4898;4908;0;4918 (IP is the remote machine) However when these tests are added to server.cfg files, I get Status==UNKNOWN and Status Information=(No output returned from plugin) I reckon its something simple that ive missed, but ive gotten a bit lost looking for it. Server: Rhel5.1 Nagios-3.0.6 installed from source Plugins 1.4.13-4 from rpm Plugins-nrpe 2.12-6 from rpm Remote Server: Rhel4u6 nagios-nrpe-2.5.2-1 nagios-plugins-nrpe-2.12-6 nagios-plugins-1.4.13-1.el4 Thanks B</div></div></blockquote><div> i would do the following - make sure that nrpe on the nagios server is connecting to the correct port at the nrpe server by comparing nrpe config files. (check encryption, port, privs, etc). - make sure that nrpe service on the clients are actually running and listening on the configured port. - check service and command definitions Also I would double check the nrpe pdf documentation -- there are examples there to get you up and running with nrpe. </div></div>