It might be using default .po file (translation - language). You can set your default language to solve that English problem. But there is a problem in here, you ought not to run nagios as root. There can occur a security flaw. Try to run only "check_users" as root or give related permission to the nagios user. Dinçer <div>2007/3/23, Sil <Spam> <<a href="mailto:smog1@free.fr">smog1@free.fr </a>>:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">I think I solved the problem. In my tests I've try the plugin in a user shell, a sudo shel and a root shell (su - ) But when I restart a service I use sudo. $ sudo /etc/init.d/nagios restart So I try to restart Nagios service in a root shell : $ su - pw # /etc/init.d/nagios restart And now it works, the own difference is the answer text is now in English !!! Not important. Take care at the plugin answer : maugain@sarge:~$ /usr/lib/nagios/plugins/check_users -w3 -c10 UTILISATEURS OK - 1 utilisateurs actuellement connectés sur |users=1;3;10;0 me@sarge:~$ su - Password: sarge:~# /usr/lib/nagios/plugins/check_users -w3 -c10 USERS WARNING - 4 users currently logged in |users=4;3;10;0 Thanks for your help. Sil ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash <a href="http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV">http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV</a> _______________________________________________ Nagios-users mailing list <a href="mailto:Nagios-users@lists.sourceforge.net">Nagios-users@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/nagios-users">https://lists.sourceforge.net/lists/listinfo/nagios-users </a> ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null </blockquote></div>