There is an error that comes and goes on my forum when trying to make threads. It is, "Forbidden You don't have permission to access /index.php on this server." I get this error frequently, and sometimes it forces me to go several days without posting new threads. However sometimes I'm allowed to make new posts without getting the error, and at the same time cannot make new threads, or sometimes can not make posts in a certain thread, but can make posts in other threads on the site. I've checked permissions several times, and there's nothing set wrong there, so the only other thing which I could see may be causing it is access to the index.php file itself, however I don't know what the 'right' permissions for that file should be. Thanks.