When you try to access the Server from localhost by it’s FQDN or CNAME repeatedly pops up for cridentials

This is about the folowing situation. I have one vitual PC for testing purposes. For example the machine is called Server01.domain.local. I have one local site hosted on it . A simple site writted on ASP.Net or Sharepoint site. It doesn’t matter. It has windows integrated authentication. I have a host header for example mysite.somedomain.com. It works perfectly from Internet. I have the host header name in local hosts file too. When i tried to browse that from local machine (mysite.somedomain.com) it pops up repeatedly for cridentials.

This happened with IIS 6.0 in windows server 2003 with sp1 or sp2. In windows server 2008 the behaviour is the same.

The solution is:


New multistring value called


Right click modify and add host headers if there are more. In this cause i add


 The full article http://support.microsoft.com/kb/926642



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