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We have a default site that requires authentication. This site has a sub-domain that does not require authentication. If a user is logged into the authenticated site (in Internet Explorer) and tries to access the public sub-domain, they get a "This page can’t be displayed" error. If they log out of the parent site, then they can access the sub-domain just fine. We know that Internet Explorer doesn't let go of Authentication cookie like the other browsers but we don't know why this is preventing the sub-domain from being accessible. What can we do to fix this?