<div dir="ltr">I'm trying to use check_nrpe with check_smartmon but I'm getting NRPE: Unable to read output at the Nagios Server. All other check plugins like check_load and check_procs work fine. I'm running the following command from my nagios server to the remote host: ./check_nrpe -H <a href="http://remotehost.domain.com">remotehost.domain.com</a> -c check_smartmon and the out put is the following: NRPE: Unable to read output This is what the remote host logs display: Aug 12 11:16:13 remotehost xinetd[7151]: START: nrpe pid=7986 from=<a href="http://198.162.1.1">198.162.1.1</a> <- Nagios Server IP Address Aug 12 11:16:13 remotehost nrpe[7986]: INFO: SSL/TLS initialized. All network traffic will be encrypted. Aug 12 11:16:13 remotehost xinetd[7151]: EXIT: nrpe status=0 pid=7986 duration=0(sec) When I use the check_smartmon directly in the remote machine as the user nagios and using sudo it works fine: [nagios@remotehost plugins]$ sudo /usr/lib64/nagios/plugins/check_smartmon ata -d /dev/sda OK: device is functional and stable (temperature: 33) If I change the only_from line on /etc/xinetd.d/nrpe file to <a href="http://127.0.0.1">127.0.0.1</a> and I run the following from the remote host I get prompted by a password: [nagios@remotehost plugins]$ sudo /usr/lib64/nagios/plugins/check_nrpe -h <a href="http://remotehost.domain.com.latpro.com">remotehost.domain.com.latpro.com</a> -c check_smartmon Password: The permissions on the device are the following: [nagios@remotehost plugins]$ ls -lah /dev/sda brw-rw---- 1 root disk 8, 0 Jan 8 2008 /dev/sda The disk group also has nagios: disk:x:6:root,nagios And again the other plugins work fine when they are invoked from the Nagios server. Like the following: [nagios@nagios-server plugins]$ ./check_nrpe -H <a href="http://remotehost.domain.com">remotehost.domain.com</a> -c check_load OK - load average: 2.14, 2.44, 2.72|load1=2.140;15.000;30.000;0; load5=2.440;10.000;25.000;0; load15=2.720;5.000;20.000;0; I added the following line on my remotehost to the /etc/sudoers: nagios ALL=(ALL) NOPASSWD: /usr/sbin/smartctl,/usr/lib64/nagios/plugins/check_nrpe,/usr/lib64/nagios/plugins/check_smartmon I also try running the NRPE as adeamon and not with xinetd and I had the same issue. Any inputs? </div>