check_users plugin problem

[Sil <Spam>]

Hi,
Excuse for my bad English, I'm French.
I'm trying to check my local users on Debian Sarge Nagios 1.3 with the 
plugin check_users.
But it only find one user each time.

Only root can make work properly the plugin :
me at sarge:~$ /usr/lib/nagios/plugins/check_users -w3 -c10
UTILISATEURS OK - 1 utilisateurs actuellement connectés sur |users=1;3;10;0
me at sarge:~$ su -
Password:
serveur:~# /usr/lib/nagios/plugins/check_users -w3 -c10
USERS OK - 2 users currently logged in |users=2;3;10;0

It must be a permission problem, so I try to add nagios user to others 
groups but it's not work.

Thanks
Sil


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