Nagios - HTTP WARNING: HTTP/1.1 403 Forbidden

You may have encountered this message after installing new frest copy of Nagios on one of your servers

This happening because nagios is searching for index page under your http root directory and cannot find it

To fix it quickly all you need to do is go to your http root directory (by default /var/www/html) and create empty index file:

cd /var/www/html
touch index.html

restart both nagios & httpd service:

service nagios restart
service httpd restart

Fixed =)