NRPE (Winrpe) Powershell Command - Unable to read output in Nagios

Server Fault Asked by J2014 on January 3, 2022

I’m trying to run an Powershell script from NRPE.cfg and get the output in Nagios.

When i run the script on the local (Windows) server, everything is just fine.
But when i put it in the NRPE.cfg en try to get the output in Nagios, i get an Unable to Read Output error.

Searched the internet but can’t find the solution, so maybe you can help me out..

The command/script is:

command[check_veeam_dailyone]=cmd /c echo c:installveeam_check.ps1 ; exit($lastexitcode) | powershell.exe -ExecutionPolicy Bypass -noninteractive -noprofile -File –

When i put this on the Windows server in PowerShell, i’ll get this output:

PS C:Install> OK – Job: VeeamOne_Daily completed successfully at
10/09/2014 04:45:51.

The “PS C:Install>” part is strange, but it does read the last job, so seems ‘okay’..

But when I try to get this output in Nagios with:

[email protected]:~# /usr/lib/nagios/plugins/check_nrpe -H -t 300 -c check_veeam_dailyone

It says:

NRPE: Unable to read output

NRPE is running fine, cause when i try to get another command, like the C drive, everything is OK:

/usr/lib/nagios/plugins/check_nrpe -H -t 300 -c pdm_disk_c
DISK OK – usage: C: 38717.2 MB (63.12% of total 61337.0 MB)|’disk in use’=38717.2MB; ‘disk usage’=63.12%;90;95; ‘disk total’=61337.0MB;

Just can’t figure out whats wrong.

The script i use is this one:

Thanks for your reply!

One Answer

  1. I would first try to reduce the complexity of the script to let's say...

    echo "Hello World" and see if that works.

  2. More than that, NRPE is usually ran by the user which is called nrpe (unless specified otherwise) so when you run your checks, run them from the nrpe user rather than from root.
  3. Also make sure that "dont_blame_nrpe" is set to "1" in nrpe.cfg on the monitored machine.
  4. Another thing you can try is wrapping this:

cmd /c echo c:installveeam_check.ps1 ; exit($lastexitcode) | powershell.exe -ExecutionPolicy Bypass -noninteractive -noprofile -File -

within a batch file (.bat) and then change the command in NRPE to something simpler like so:


Then try to run the command again and see if that works.

Answered by Itai Ganot on January 3, 2022

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