Redirection to LoginPath not working for not authenticated users

Unless I go directly in the browser to '/windowsauthentication/ntlm' I don't get myself authenticated. 
I am running the sample code from the samples folder .

This was working previous to the port to RTM. I could just run the sample app and I was automatically authenticated.

Also if I change the url in the ActiveDirectoryOptions I can't get authenticated at all.
