All OJS requests go through the index.php script in the OJS install directory, even though it may appear to refer to subdirectories such as install.
For example, a request that goes to http://myhost.com/ojs2/index.php/install
is handled by the index.php script with the "install" part being passed to the script in an environment variable.
Is index.php being specified in the requests that are causing trouble? Do your server logs indicate what the problem is?
Open Journal Systems Team