url gets a 404, but routes.php finds it

[eluser]überfuzz[/eluser]
I'm just in the middle of transferring a site to codeigniter. When I run the base url in the browser the default controller gets loaded as stated in routes.php. But when I try to run it in the browser I get a 404.

Code:

www.base_url.com           | $route['default_controller'] = "home"; loads
www.base_url.com/home      | 404 is thrown

I can't find the misstake... If someone would point out the error I'd go nake:

[eluser]rogierb[/eluser]
Did you setup the .htaccess?

[eluser]überfuzz[/eluser]
No I didn't Thanx!!!