I've installed Nagios on a new server following the instructions from the site below: http://sharadchhetri.com/2012/08/05/installing-nagios-3-4-centos-6-3/
The upshot is:
yum install nagios nagios-devel nagios-plugins* gd gd-devel httpd php gcc glibc glibc-common
Everything seems to be running fine, htpasswd generated, pre-flight check returns normal
nagios -v /etc/nagios/nagios.cfg
I can log into the web server page (server.com/nagios), enter my basic auth details and see the default page fine.
When I click on any of the menu items, I'm presented with an "Internal Server Error" page on the RHS frame.
/var/log/messages don't give any clues.
I'm new to Nagios, but can anyone offer advice on where to look to get this solved?
Dedicated server running CentOS 6.3, x64, 4GB ram