The System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy is enforced only if the client and server supports extended protection.
Syntax
PolicyEnforcement WhenSupported
Requirements
Namespace: System.Security.Authentication.ExtendedProtection
Assembly: System (in System.dll)
Assembly Versions: 4.0.0.0
Assembly: System (in System.dll)
Assembly Versions: 4.0.0.0