are you sure nagios works ??? check this : # /usr/local/etc/rc.d/nagios.sh status whats the output ??? and what you get when u try to run nagios with -s , -d or -v options ??? are you sure that nagios works fine ? and did u change anything in your httpd.conf file ? try running : nagios -v nagios.cfg nagios -d nagios.cfg nagios -s nagios.cfg and share the outputs with us. and check your httpd.conf again.