Form helper post to index.php

[eluser]Christophe28[/eluser]
Hello,

I'm a new user of codeigniter.

I escaped index.php in nginx and it works perfectly (I guess) When I surf to mysite.com/controller the proper controller is loaded. But now I'm want to use a login form. When I press the submit button, I got redirected to mysite/index.php/login/validate_credentials instead of mysite/login/validate_credentials

And obvious that didn't work, otherwise I wouldn't be here. What am I doing wrong?

I'm sure it is a small thing :-)

THX!