Upgraded from 3.1.2 from 3.0.6 using the following instructions:
nagios.sourceforge.net/docs/3_0/ … l#nagios3x
Now I cannot access “http:///nagios” with localhost being the server where Nagios is installed.
When trying to access the site, it prompts to download the following file
Nagios
unknown file format 768K
It seems it is [application/x-httpd-php] file.
Help please
looks like your apache server isn’t configured for PHP.
The package managers of almost every distribution have some php package.
Installed libapache2-mod-php5
Restarted Apache
Changed link to ](http://)/nagios/index.php
Works now.
Thanks Luca
you may still have the html pages around, if you rename them so they are called index.bak or something which is NOT html, htm or php it should go autmoatically to index.php. (i think they can be deleted but if it doens’t work it’s better to be able to go back 
)
Thanks for the update 
Luca