IIS Integrated Windows Authentication

Have you ever encounter a pop-up windows asking for username and password when you try to access an intranet site hosted on IIS with Integrated Windows Authentication even though you are login to your windows with domain account?

IE determines the URL address whether it is local or not by checking the URL if it is contain a dot (.) or not. If the URL contains a dot, it assumes the URL is not local, thus it won't pass the user domain credential to the server (what for?).

You can avoid this issue by putting the URL in your IE setting's Local Intranet Sites