Feature: authenticate to the server without sending the password

Either using password-authentication key exchange or via authorized keys

src/network/network.cpp

@@ -321,6 +321,7 @@ StringID GetNetworkErrorMsg(NetworkErrorCode err)
 		STR_NETWORK_ERROR_CLIENT_TIMEOUT_MAP,
 		STR_NETWORK_ERROR_CLIENT_TIMEOUT_JOIN,
 		STR_NETWORK_ERROR_CLIENT_INVALID_CLIENT_NAME,
+		STR_NETWORK_ERROR_CLIENT_NOT_ON_ALLOW_LIST,
 	};
 	static_assert(lengthof(network_error_strings) == NETWORK_ERROR_END);