Any ProtectionLevel settings of a transport are ignored if the SecurityMode is set to None. For more information about the ProtectionLevel property, see Understanding Protection Level.
For more information about Windows Communication Foundation (WCF) security and how this property affects general security features, see Securing Services and Programming WCF Security. For more information about the transport mode, see Transport Security.
Note that if you choose TransportWithMessageCredential, then the value set in HttpClientCredentialType or TcpClientCredentialType is ignored.