Ironport Webfilter XP embedded SSO authentication not passing for IE

bciengineer
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I've installed an Ironport WSA webfilter for a customer that has thousands of Wyse thin clients some running XPe and others Win7e. The XP clients are being prompted for login to the Ironport when launching IE. This terminals are members of the domain and the initial login is using a domain user account. The Win7 clients don't have this problem. It's as if SSO doesn't work with XPe.
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I found the answer to this. The Wyse terminals have a trust issue with the Ironport. The work around is to add the Ironport exmple http://ironport to Intranet trusted sites.

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