MVC3 with IIS7 credential error

     When I deploy my new MVC 3 project to a Windows 2008 R2 with IIS 7 server, I got an error with “401 – Unauthorized: Access is denied due to invalid credentials” on every page.
     After some google’s, I figure out the reason was: in my “_layout” page, I have the code “@Html.RenderAction(…)”, and the action I was trying to render actually is under “Home” controller with “[Authorize]” attribute. In another word, when IIS calling MVC pages, ASP.NET will ask for authentication, and if not authenticated, it’s supposed to redirect to “_logon” page, but unfortunately the “_logon” page (which is using “_layout” as master page of cause) also asked for authentication because of rendering action. It became to a dead end.
     Based on the reason explained above, the fastest solution is remove the “[Authorize]” attribute from the controller. But if you don’t want change your code, go to IIS management tool, select the website your are running, choose “Error Pages”, and “Edit Feature Settings”, change “Error Responses” to “Detailed errors”.

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