IIS 7.5(7.0) 에서 HTTP Error 401.3 - Unauthorized 문제가 발생하면

출처 : stack overflow : IIS 7.5 (Windows 7) - HTTP Error 401.3 - Unauthorized

I had the same issue in IIS 7.5 on Windows Server 2008. I solved the issue with the following steps:

Open IIS Manager

Click the website you want to edit

Double-click Authentication

Click Anonymous Authentication, then click Edit... under Actions

Change to use the Application pool identity credentials instead of the Specific user (mine was IUSR)

After I made this change, my 401.3 errors disappeared.