Timeout shows RC 255 and full command

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ryleybob
Posts: 1
Joined: Wed Sep 17, 2025 3:22 am

Timeout shows RC 255 and full command

Post by ryleybob »

Hi everyone,

Not 100% sure if this is a Nagios XI or a Nagios Core issue.

I’m seeing an odd combination of return-code 255 and full-command echo when a check times out, and the command line contains a clear-text password.

I’m running a distributed check setup with Nagios Core 4.5.3 on the master using Mod Gearman:

Environment
Nagios Core 4.5.3 (single master)
mod-gearman NEB: 1.0.1 on the master
mod-gearman worker: 3.3.0 on a separate node
NCPA 2.4.4 on the target host, launching a custom Bash wrapper → pytest → Selenium
What happens
A service check that ultimately calls NCPA + a custom plugin sometimes exceeds its internal timeout.
User avatar
lgute
Posts: 420
Joined: Mon Apr 06, 2020 2:49 pm

Re: Timeout shows RC 255 and full command

Post by lgute »

Hi @ryleybob,

Thanks for reaching out. A bit more information would be helpful.
  1. What version of XI are you running?
  2. Are you using Mod Gearman or the bundled Nagios Mod Gearman?
  3. Are you able to successfully run the check on the command line and through the NCPA interface?
Please let us know if you have any other questions or concerns.

-Laura
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