Rewrite problem

[Derokorian]

So I'm having a problem with rewrites on my server. Basically if I go to site.example.com/ or site.example.com/index.php/ it works but if I go to site.example.com/index.php I get a 404 problem. Can anyone spot what is wrong?

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-s
RewriteCond %{REQUEST_FILENAME} !-l
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^.*$ index.php [NC,L]

[Ashley_Sheridan]

I'm not great with URL rewriting, so this might not help, but shouldn't there be a / before the index.php part, to let it know where to find the index file?