IIS 7 - "Internet Explorer cannot display the webpage" when anonymous access is turned off

Question

I've got an ASP .NET website running on IIS 7. I'm trying to use Integrated Windows Authentication but having a hard time with IE. In IIS, I've enabled Windows and Forms Authentication and disabled anonymous authentication. Everything is working smoothly in Chrome but IE gives me a generic message:

"Internet Explorer cannot display the webpage"

As soon as I enable anonymous authentication in IIS, I can view the page properly in IE (but without proper authentication).

Googling the problem has given me some suggesions, none of which have worked. I've double checked that Keep-Alives are enabled and I've tried enabling and disabling Kernel mode authentication in IIS.

The host-header I'm using to access the website is not the same as the actual name of the webserver machine, if that makes any difference, but the host-header has been mapped to 127.0.0.1 in the hosts file.

Any ideas?

UPDATE: According to this: http://mvolo.com/iis-70-twolevel-authentication-with-forms-authentication-and-windows-authentication/

Using Integrated Windows Auth and Forms Auth at the same time does not work properly when the app pool is in integrated mode. I switched over to classic mode and now IE is able to display the site properly, although I have a new problem ... IE will not accept any cookies so the session is not sticking ....

UPDATE 2: Problen solved, apparently a host header with an underscore messes IE up big time. Cookies won't work and mixed mode auth + integrated app pool mode either.

Solution: Access the website with another host header that does not contain an underscore and problem goea away!

Solution

My solution: apparently a host header with an underscore messes IE up big time. Cookies won't work and mixed mode auth + integrated app pool mode either.

Solution: Access the website with another host header that does not contain an underscore and problem goes away!