Thread:Project:Support desk/change or remove default index page name

Hi, for some reason, all my links include /index.php/ on the URL, which is very annoying and affects SEO negatively. Even when accessing the domain directly, I am redirected to "/index.php/MainPage".

The question is, how do I get rid or change this. I have root access to the entire server and can edit all files. Thanks!

MediaWiki 1.21.1 PHP 5.3