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ITsVISTA KB-Link: KB981205

A hotfix is available that adds the Extended Protection for Authentication feature to WCF in the .NET Framework 3.5 SP1 for Windows Vista and for Windows Server 2008

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

There is a download that resolves this issue. See Hotfixes for details.
32-bit Download: Contact Microsoft
64-Bit Download: Contact Microsoft

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB981205.

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