Thread:Project:Support desk/403 error, CSS mess, only on IE/FF, not on Chrome

Hello everyone, greetings!

So my problem is as follows:

Whenever I access my mediawiki site, ( site.projetopescar.org.br/tsp/ ), the first page appears all messed up, without CSS. If I click on the 'authenticate' link to log-in, I get a 403 error.

The problem ONLY happens in IE and Firefox. Using Chrome, everything is just fine. What could possibly be happening?

MediaWiki 1.17.0 PHP 5.3.23 (apache2handler) MySQL 5.0.95

Any help would be greatly appreciated!

Best regards, Felipe