I recently upgraded our site to Joomla 3.2. Post upgrade I was unable to access multiple areas of the backend and was receiving 404 errors. My decision was to take the site offline while I sorted it out. I could not take the site off line from the admin area, so I then changed public $offline = '0'; to public $offline = '1'; in configuration.php. In order to save the file, I needed to change the permissions from 444 to 644. Immediately following this, i received the following error when visiting the site in the browser.
No configuration file found and no installation code available. Exiting...
I'm not sure how this would be a server issue as all of my other 3.2 sites are running smoothly. However returning configuration.php to its original state did not resolve the issue.
Thanks for your help in advance
Perhaps the server runs out of disk space. Try clearing folders tmp and cache...