Hi All, I have installed nagios-2.9 and nagios-plugins-1.4.9 on a RHEL 5 system. For monitoring MySql, I downloaded check_mysqld.pl and i kept it under the directory /usr/local/nagios/libexec/ I modified the following parameters in check_mysqld.pl file to my need; my $HOSTNAME= 'localhost'; my $PORT= 3306; my $DATABASE= 'test'; my $USERNAME= 'username'; my $PASSWORD= 'password'; After that, in the file commands.cfg I added the command for mysqld as define command{ command_name check_mysqld command_line $USER1$/check_mysqld.pl -H $HOSTADDRESS$ -u $ARG1$ -p $ARG2$ } Then, in the file localhost.cfg, I added the service for mysqld as define service { use local-service host_name localhost service_description MYSQLD check_command check_mysqld } Then I restart nagios..... Nagios starts without any error. But when I access nagios from the web interface <a onclick="return top.js.OpenExtLink(window,event,this)" href="http://localhost/nagios/" target="_blank"> http://localhost/nagios/</a> The services section shows MYSQLD is critical. Why is it so? I guess I have missed something while configuring the check_mysqld.pl plugin. Please be informed, when i try checking the mysqld service from the command prompt using the plugin, it works well... following is the output of the same; [root@RHEL5 libexec]# ./check_mysqld.pl MYSQL 5.0.22 OK Please help!!! I need the web interface of Nagios to work as well.... With Regards, -- Bijit