c# being done with a remote computer sending and receiving data using stunserver

Question

I can not send data stunserver remote computer using the two. Data comes from local computers, but data on remote computers is not going to come.

I'm using my program, stunserver

public void run() 
{
    UpdateText("Now Listening..");
    remoteSender = new IPEndPoint(IPAddress.Any, 0);
    tempRemoteEP = (EndPoint)remoteSender;
    byte[] packet = new byte[1024];
    while (true)
    {
        if (socket.Available > 0)
        {
            this.nbBytesRx = socket.ReceiveFrom(packet, ref tempRemoteEP);
            nbPackets++;
            seqNo = BitConverter.ToInt16(packet, 0);
            UpdateText(nbPackets.ToString() + ":" + seqNo.ToString() + " / ");
        }
    }
}

Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram,  ProtocolType.Udp);

socket.Bind(new IPEndPoint(IPAddress.Any, 0));
string localEP = socket.LocalEndPoint.ToString();
string publicEP = "";
string netType = "";
STUN_Result result = STUN_Client.Query("stunserver.org", 3478, socket);
netType = result.NetType.ToString();
if (result.NetType != STUN_NetType.UdpBlocked)
{
    publicEP = result.PublicEndPoint.ToString();
}
else
{
    publicEP = "";
}
UpdateText("Local EP:" + localEP);
UpdateText("Public EP:" + publicEP);

ThreadStart startMethod = new ThreadStart(this.run);
thread = new Thread(startMethod);
thread.Start();

Answer 1

I am working on the same problem, and using the same library.

Did you check if you get your endpoint? I found our that pointed server wasn`t online. So I made a List of servers to go throught.

My method to get public EP:

public static IPEndPoint GetMyPublicEP() {

// Create new socket for STUN client.
            Socket _socket = new Socket
                (AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            _socket.Bind(new IPEndPoint(IPAddress.Any, 0));

            List<string> _stunServers = new List<string> { // список стан серверов для проверки своей ендпоинт, не все работают
                "stun.l.google.com:19302",
                "stun1.l.google.com:19302",
                "stun2.l.google.com:19302",
                "stun3.l.google.com:19302",
                "stun4.l.google.com:19302",
                "stun01.sipphone.com",
                "stun.ekiga.net",
                "stun.fwdnet.net",
                "stun.ideasip.com",
                "stun.iptel.org",
                "stun.rixtelecom.se",
                "stun.schlund.de",
                "stunserver.org",
                "stun.softjoys.com",
                "stun.voiparound.com",
                "stun.voipbuster.com",
                "stun.voipstunt.com",
                "stun.voxgratia.org",
                "stun.xten.com"
            };

            foreach (string server in _stunServers)
            {
                try
                {
                    STUN_Result result = STUN_Client.Query(server, 3478, _socket);
                    IPEndPoint myPublicEPStun = result.PublicEndPoint;

                    if (myPublicEPStun != null)
                    {
                        _myPublicEPStun = myPublicEPStun;
                        break;
                    }
                }
                catch (Exception E)
                {
                    Console.WriteLine("Якась необ`ясніма магія трапилась");
                }
            }
            return _myPublicEPStun;
        }

Answer 2

I had the same problem... i solved it disabling Windows Firewall. It was blocking all the traffic.