Error receiving in UDP: Connection refused

Question

I am trying to send a string HI to a server over UDP in a particular port and then to receive a response. However, after I try to get the response using recvfrom() I was stuck i

Answer 1

My guess would be that your ip address is bad somehow, or the port is already in use somehow. UDP is connectionless, so there really isn't any "connection" to fail.

Answer 2

Chances are your're sending something to a server who does not listen on that particular port. That would cause an icmp message to be sent back , and your next recvfrom will return an error in the case where you connect the socket.

Check with tcpdump or wireshark what's going on on the wire.