Could not load type System.Security.Authentication.....

如果WCF出现这个错误,请把 KB979909 & KB976769v2 两个补丁删除.

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

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原文地址：https://www.cnblogs.com/wingfay/p/1756876.html