I'm using plugin which gives me warning or crtis with established connections. If I run it on local machine it gives:

*root@graber:/usr/lib/nagios/plugins# ./check_connections -w 1 -c 5 -C sshd
CRITICAL  Established connections: 6*

I know, I run as root. But:

Rights to the file:

root@graber:/usr/lib/nagios/plugins# ls -all check_connections
-rwxr-xr-x 1 nagios nagios 5459 2012-07-06 10:19 check_connections

/etc/sudoers:

root@graber:/usr/lib/nagios/plugins# cat /etc/sudoers
Defaults        env_reset
root    ALL=(ALL:ALL) ALL
%admin ALL=(ALL) ALL
nagios ALL=(ALL) NOPASSWD: /usr/bin/lsof
nagios ALL=(ALL) NOPASSWD: /usr/lib/nagios/plugins/

/etc/nagios/nrpe.cfg:

*nrpe_user=nagios
nrpe_group=nagios*
*dont_blame_nrpe=1*
*command_prefix=/usr/bin/sudo
command[check_connections]=/usr/lib/nagios/plugins/check_connections -w 1 -c 5 -C sshd*

log from remote:

*2012-07-06T11:12:49+02:00 graber nrpe[25928]: Handling the connection...
2012-07-06T11:12:49+02:00 graber nrpe[25928]: Host address is in allowed_hosts
2012-07-06T11:12:49+02:00 graber nrpe[25928]: Host is asking for command 'check_connections' to be run...
2012-07-06T11:12:49+02:00 graber nrpe[25928]: Running command: /usr/lib/nagios/plugins/check_connections -w 1 -c 5 -C sshd
2012-07-06T11:19:11+02:00 graber nrpe[26100]: Return Code: 2, Output: NRPE: Unable to read output*

Why is this happening? I'm out of ideas, I've searched google for 2 days now :)