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I recently updated my XP machine now I can't run any of my WCF (.NET 3.5) web apps. It crashes when I call var wsHttpBinding = new WSHttpBinding(); with the following exception:

Could not load type 'System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy' from assembly 'System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

I have read this post but it did not help. There are many posts at Microsoft that do not help either.

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Tawani
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  • possible duplicate of [WCF service errors after installing WindowsXP updates](http://stackoverflow.com/questions/3004299/wcf-service-errors-after-installing-windowsxp-updates) – Mark Hurd Aug 12 '14 at 10:34

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