Thread:Project:Support desk/MediaWiki:Common.css 404 error/reply (4)

Note: Mediawiki should not send 404's for things in mediawiki namespace that have a default, even if they don't "exist". (Common.css has a default, so MW should not send a 404 for it).

This sounds most likely something wrong with your web server configuration (In particular if the normal create this page is not shown). Do you have access to the apache error log, it might say something of interest.

This can potentially be caused by short urls being misconfigured. This is likely if none of the pages in mediawiki namespace are handled by mediawiki.

Other things to look into is do you have mod_security installed (mod_security does weird crap).