Gets a bool value that indicates whether mutual authentication occurred.
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To request mutual authentication, set the WebRequest.AuthenticationLevel property using the System.Net.Security.AuthenticationLevel.MutualAuthRequested or System.Net.Security.AuthenticationLevel.MutualAuthRequired enumeration value. The default value for the WebRequest.AuthenticationLevel property contains System.Security.Principal.TokenImpersonationLevel.Delegation and System.Net.Security.AuthenticationLevel.MutualAuthRequested.