public ISaslStep Transition(SaslConversation conversation, byte[] bytesReceivedFromServer)
            {
                // Even though RFC says that clients should specifically check this and raise an error
                // if it isn't true, this breaks on Windows XP, so we are skipping the check for windows
                // XP, identified as Win32NT 5.1: http://msdn.microsoft.com/en-us/library/windows/desktop/ms724832(v=vs.85).aspx
                if (Environment.OSVersion.Platform != PlatformID.Win32NT ||
                    Environment.OSVersion.Version.Major != 5) {
                    if (bytesReceivedFromServer == null || bytesReceivedFromServer.Length != 32) //RFC specifies this must be 4 octets
                    {
                        throw new MongoAuthenticationException(conversation.ConnectionId, message: "Invalid server response.");
                    }
                }