IE 10 Prompting for credentials – Windows Authentication in IIS
When using IE7, IE8, or IE9, the domain user can access the web site without being prompted for a password
When using IE10, the user is prompted everytime. Is there a setting I can change on IIS or somewhere else to prevent being prompted in IE10?
if IE10 performs Intranet zone detection differently than IE6/7/8/9, that’s news to me!
these articles explain a little how it’s supposed to work:
I think you should check to see if the pc in question does have some different settings in the proxy/connection configuration area of IE?