Linux Nagios nrpe and sudo: NRPE: Unable to read output On CentOS 5 (and RedHat EL as well), you can encounter the following behaviour when configuring an nrpe plugin with sudo: [andrea@feyd ~]$ /usr/lib/nagios/plugins/checknrpe -H 1.2.3.4 -c checkmd_raid NRPE: Unable to read output...