I am running the check_networkload.pl check command on remote servers using check_nrpe on the monitoring server. On all machines apart from 1 it works fine, on the 1 machine it returns "Unable To Read Output". All other commands on that machine being run by check_nrpe are working fine.
If I run ./check_networkload.pl from the command line on this machine it also works fine. It's only a problem when being run by check_nrpe.
It can't be a permissions issue as permissions are configured the same for all the other check commands on each machine, it's not an SSL issue as this produces a different error message.
Thanks In Advance
PS. What extensions are allowed on this forum when sending attachments? I have strace output examples for when check_nrpe works and when it doesn't.