Nagios Support Forum

Hi ,

We have configured one linux server and few services are giving output and few now. Throwing attached error (NRPE: Unable to read output ) . If run script localy i am getting output , however when i try to run the command from nagios i get error :- NRPE: Unable to read output

And script has the same persmisson as the working scripts, and i dont see any permission issue.

If you search the forum for this topic "NRPE: Unable to read output" you will see a lot of information that might help you. Off the top of my head, I would say that the commands that nagios (the user) is executing on the remote host are not in the sudoers file and therefore, nagios (the user) is not able to gather the appropriate information.

Thanks for your reply

However i am getting the output for other plugins as well with any permission issue. I suspect it is because of SELINUX , as i can see SELINUX is enable on the server.

Have you tried disabling SELINUX and checking to see? will temporarily disable it.

I completely agree with eloyd here, thats not all to uncommon though. Let's disable selinux, get it working properly then if you need to re-enable you\we can work out the proper context that nrpe and plugins will need to be placed in.

@veenm
You can check if selinux has been disabled by running: However, sometimes, this error ("NRPE: Unable to read output") can be caused by incorrect plugin paths. Double check how commands are defined on the client.
Hope this helps.

@eloyd
Thanks again!

You can thank me if it works.

Hi,

Problem resolved , i disabled the SELINUX and it working fine now.