private boolean test1Redo() throws UtilityException, SocketException, UnknownHostException, IOException, MessageAttributeParsingException, MessageHeaderParsingException{
		int timeSinceFirstTransmission = 0;
		int timeout = timeoutInitValue;
		while (true) {
			// redo test 1 with address and port as offered in the changed-address message attribute
			try {
				// Test 1 with changed port and address values
				socketTest1.connect(ca.getAddress().getInetAddress(), ca.getPort());
				socketTest1.setSoTimeout(timeout);
				
				MessageHeader sendMH = new MessageHeader(MessageHeader.MessageHeaderType.BindingRequest);
				sendMH.generateTransactionID();
				
				ChangeRequest changeRequest = new ChangeRequest();
				sendMH.addMessageAttribute(changeRequest);
				
				byte[] data = sendMH.getBytes();
				DatagramPacket send = new DatagramPacket(data, data.length);
				socketTest1.send(send);
				logger.finer("Test 1 redo with changed address: Binding Request sent.");
				
				MessageHeader receiveMH = new MessageHeader();
				while (!(receiveMH.equalTransactionID(sendMH))) {
					DatagramPacket receive = new DatagramPacket(new byte[200], 200);
					socketTest1.receive(receive);
					receiveMH = MessageHeader.parseHeader(receive.getData());
					receiveMH.parseAttributes(receive.getData());
				}
				MappedAddress ma2 = (MappedAddress) receiveMH.getMessageAttribute(MessageAttribute.MessageAttributeType.MappedAddress);
				ErrorCode ec = (ErrorCode) receiveMH.getMessageAttribute(MessageAttribute.MessageAttributeType.ErrorCode);
				if (ec != null) {
					di.setError(ec.getResponseCode(), ec.getReason());
					logger.config("Message header contains an Errorcode message attribute.");
					return false;
				}
				if (ma2 == null) {
					di.setError(700, "The server is sending an incomplete response (Mapped Address message attribute is missing). The client should not retry.");
					logger.config("Response does not contain a Mapped Address message attribute.");
					return false;
				} else {
					if ((ma.getPort() != ma2.getPort()) || (!(ma.getAddress().getInetAddress().equals(ma2.getAddress().getInetAddress())))) {
						di.setSymmetric();
						logger.fine("Node is behind a symmetric NAT.");
						return false;
					}
				}
				return true;
			} catch (SocketTimeoutException ste2) {
				if (timeSinceFirstTransmission < 7900) {
					logger.config("Test 1 redo with changed address: Socket timeout while receiving the response.");
					timeSinceFirstTransmission += timeout;
					int timeoutAddValue = (timeSinceFirstTransmission * 2);
					if (timeoutAddValue > 1600) timeoutAddValue = 1600;
					timeout = timeoutAddValue;
				} else {
					logger.config("Test 1 redo with changed address: Socket timeout while receiving the response.  Maximum retry limit exceed. Give up.");
					return false;
				}
			}
		}
	}