We just moved from a Windows Server 2003 to a Windows Server 2012. Whenever we try to access any of the websites in IIS with the the error
HTTP Error 401.2 - Unauthorized
You are not authorized to view this page due to invalid authentication headers.
I already made sure that anonymous authentication was enabled. Windows Authentication is also available as an option, but it is disabled.
I gave the user IUSR full access to the folders where the webpage files are located in the server.
I also made sure that on the Authorization rules all users were allowed.
In the application pool, the Enable 32-bit Applications is set to True.
I'm thinking this is some kind of authentication error because if I enable Windows Authentication instead of Anonymous Authentication, I can see the website when I entered a valid username and password from one of the accounts in the server.
Any help will be greatly appreciated.