KB981205

A hotfix is available that adds the Extended Protection for Authentication feature to Windows Communication Foundation (WCF) in the Microsoft .NET Framework 3.5 Service Pack 1 (SP1). This hotfix applies to Windows Vista and to Windows Server 2008. The Extended Protection for Authentication feature helps prevent relay attacks when you use Integrated Windows Authentication (IWA).

For more information about the Extended Protection for Authentication feature and about relay attacks, visit the following Microsoft Developer Network (MSDN) Web site:
Overview of the Extended Protection for Authentication feature and of relay attacks

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