In a new SharePoint web application, it prompted for user name and password repeatedly
and finally resulted in "Not Authorized - HTTP Error 401. The requested resource requires user authentication" - in the SharePoint site with Kerberos Authentication Enabled.
Here is some more spec: MOSS 2007, Windows 2008, IIS 7.5.
Solution: With IIS 7.5, kerberos enabled for SharePoint, we must turn OFF the "Kernel Mode Authentication". Here is how:
1. Open the IIS, Select the authentication feature of the appropriate web application
3. Make sure you have unselected the "Kernel Mode Authentication"
4. Do an IISReset
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