How to support NTLM authentication with fall-back to form in ASP.NET MVC?

Question

How can I implement following in ASP.NET MVC application:

1. user opens intranet website
2. user is silently authenticated if possible
3. if NTLM auth

Answer 1

You cannot have both NTLM and FormsAuthentication in the same ASP.NET application. You will need two different applications in separate virtual directories.