This KB article addresses the following NRPE error:
Return Code Of 126 Is Out Of Bounds - Plugin May Not Be Executable
Assumed Knowledge
The following KB article contains an explanation of how NRPE works and may need to be referenced to completely understand the problem and solution that is provided here:
NRPE - Agent and Plugin Explained
Troubleshooting The Error
Many times when a plugin is downloaded from the Nagios Exchange and copied to the remote host, it will not have executable permissions. You can verify this by getting a long-listing of the libexec plugin directory. For this example will will be using the command check_foo.sh. On the remote host execute the following command:
ls -l /usr/local/nagios/libexec
You should see a listing similar to:
-rwxr-xr-x. 1 root root 4173 Nov 21 01:39 check_bl
-rw-r--r--. 1 root root 2289 Nov 21 01:39 check_foo.sh
The far left column of the listing are the permissions for each file. If you noticed, check_foo.sh is missing an "x" in a few places. These are executable permissions and can easily be added to the file using the following command:
chmod +x /usr/local/nagios/libexec/check_foo.sh
Remember that check_foo.sh is just an example, you will change /usr/local/nagios/libexec/check_foo.sh to the actual name and path to your plugin that is missing executable permissions.
Final Thoughts
For any support related questions please visit the Nagios Support Forums at:
http://support.nagios.com/forum/
Article ID: 614
Created On: Fri, Jul 14, 2017 at 3:39 AM
Last Updated On: Fri, Jul 14, 2017 at 3:39 AM
Authored by: tlea
Online URL: https://support.nagios.com/kb/article/nrpe-return-code-of-126-is-out-of-bounds-plugin-may-not-be-executable-614.html