IIS7 Multiple Headers Error "401 - Unauthorized: Access is denied due to invalid credentials."

If you setup your site on IIS7 with multiple headers and you get this error "401 - Unauthorized: Access is denied due to invalid credentials.", you need to set the Windows Authentication on the site. To do this, follow the following steps:

1.On IIS Manager, select the website
2. Select "Authentication" under Feature View
3. Select "Windows Authentication"
4. Hit Ok


If "Windows Authentication" is not found on the list of providers, you must add that role to Web Server (IIS). To do so, follow this link