UdpClient, Receive() right after Send() does not work?

Question

Consider the following code:

client.Send(data, data.Length, endpoint);
byte[] response = client.Receive(ref endpoint);

While, according to WireShark (network sniffer), the remote host does reply with data, the application here just waits for data forever... it does not receive the answer from the remote host for some reason.

Any ideas?

Answer 1

You probably want to setup two UdpClients: one for listening, one for sending.

For the receiving UdpClient, use the constructor that takes a port.

Answer 2

probably the remote host has firewall then couldn't response to request, before send request set the

client.Client.ReceiveTimeout = 5000; 

so when the response couldn't get the request you have a exception