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We have a web page that is configured for Integrated Windows Authentication under ISS. When I access this page via its HostName (e.g. http://MyHost/mypage.htm) it works. When I access this page via the IP address of the host (e.g. instead of MyHost, use MyHost’s IP address in the URL), I’m prompted for a username & password. Can anyone explain why this is happening?
If the computer name portion of the requested URL contains periods (such as http://www.microsoft.com and http://10.0.0.1), Internet Explorer assumes that the requested address exists on the Internet and does not pass any credentials automatically.
Addresses without periods (such as http://webserver) are considered to be on the intranet (local); Internet Explorer passes credentials automatically. The only exception is addresses included in the Intranet zone in Internet Explorer.
http://support.microsoft.com/kb/258063