Security :: Authentication Not Working When Launching From Visual Studio 2008

I know this is working correctly beacuse when I publish my website to my hosting provider, and request a resource in a protected directory, and I am not currently authenticated, I get automatically redirected to my login page and then once successfully authenticated granted access and redirected back to the sure *.aspx file in my protected directory (assuming I am authorized for those resources).

So that is working no problem.

However, when I run this from visual studio 2008 (F5) in debug mode, I am not being required to authenticate. It simply serves up the protected resource without asking for my credentials.

If I put a [PrincipalPermission(SecurityAction.Demand, Authenticated = true)] on a BLL class method, it will throw an security exception, but the page that is calling it is in a secure directory and I am never asked to authenticate using the login page.

I am closing and re-opening brosers, clearing cookies, etc..., but no matter what I do I am not automatically redirected to the login page, and the secure page when I launch from visual Studio running on the embedded local host. Thiis working perfectly externally, same build, same web.config, pointing to the same database, on the hosting provider. (yes, eventually, I will be using dev/test/prod db configurations to test, but for now for simplicity I am keeping it the same)

Not only is it maddening, but worse yet, it would obviously make testing this application impossible after the initial release.