Hello
It is probably because you haven't added those ip addresses to the IP
inclusion list? See if the following article helps
<a style='text-decoration: underline;' href="http://support.microsoft.com/default.aspx?scid=kb;en-us;813368" target="_blank">http://support.microsoft.com/default.aspx?scid=kb;en-us;813368</a>
Thanks,
Yogita Manghnani
Microsoft Developer Support
Internet Information Server
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