If you are using symfony or Zend Framework, most probably you are using a .htaccess file indicating apache to direct all requests for non existing files to the symfony or ZF bootstrapper which is usually index.php in the web root. If you get the above error, it is mostly probably . . . Read more
When the server is given just a path, such as yourdomain.com, it will look for a document, in the order of the list below, to serve. This document can also be a CGI or script. If you need additional default document names added to this list, just start a support . . . Read more
To change the index file of a site, add the following line to a file .htaccess in your httpdocs directory: Replace home.html with the file that needs to be the index.