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ITsVISTA KB-Link: KB973917

Description of the update that implements Extended Protection for Authentication in Internet Information Services (IIS)

This article describes a non-security update that implements Extended Protection for Authentication in Internet Information Services (IIS).

When Extended Protection for Authentication is enabled, authentication requests are bound to both the Service Principal Names (SPN) of the server to which the client tries to connect and to the outer Transport Layer Security (TLS) channel over which Integrated Windows Authentication happens.

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB973917.

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