NRPE: Unable to read output

[Jake Solid]

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 remotehost.domain.com -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=
198.162.1.1 <- 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 at 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 127.0.0.1 and
I run the following from the remote host I get prompted by a password:*
*[nagios at remotehost plugins]$ sudo /usr/lib64/nagios/plugins/check_nrpe -h
remotehost.domain.com.latpro.com -c check_smartmon
Password:
*
*The permissions on the device are the following:*
*[nagios at 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 at nagios-server plugins]$ ./check_nrpe -H remotehost.domain.com -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?
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