When trying to connect to an internal (domain) website that uses Integrated Windows Authentication using a fully qualified domain name (server.domain.com) the user is prompted for authentication. If the authentication is cancelled the follow error is displayed:

You are not authorized to view this page
HTTP Error 401.2 - Unauthorized: Access is denied due to server configuration.

If the short name is used authentication passes through as expected.

This is a feature of Internet Explorer 7. To resolve the issue:

- Select Tools | Internet Options
- Select the Security tab
- Select Local Intranet (if this is the zone the affected website appears in)
- Click Custom level...
- Under User Authentication | Logon select "Automatic logon only in Intranet Zone" or "Automatic logon with current username and password"
- Click OK
- Click OK

This can also be set in Group Policy in the following location:

- User Configuration | Administrative Templates | Windows Components | Internet Explorer | Internet Control Panel | Security Page | Intranet Zone | Logon options

Alternatively add the site to the Trusted Sites zone:

- Select Tools | Internet Options
- Select the Security tab
- Select Trusted sites
- Click Sites
- Click Add
- Click Close
- Click OK