It seems that some versions of IE create the wrong SPN when accessing a web site via a CNAME record. More info at
http://support.microsoft.com/kb/911149/en-us
To be on the safe side, use A records in DNS to point to your SharePoint site.
SharePoint, Kerberos and DNS CNAME Records
Published August 6, 2009 SharePoint , Technical Leave a CommentTags: DNS CNAME records, Kerberos
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