CODEWITHSUNDEEP
c#.netsockets
Jasim Khan Afridi
Jasim Khan Afridi

Reputation: 776

Close a socket and then reopen it from the same port in .net

Well, I wonder if some one can help with a problem that I encounter....

I want to close a socket and then rerun from the same port. This is what i am doing...

opening:

    UdpServer = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
    UdpServerIpEndPoint = new IPEndPoint(IPAddress.Any, 9050);
    UdpEndPoint = (EndPoint)UdpServerIpEndPoint;
    UdpServer.Bind(UdpServerIpEndPoint);

closeing:

        UdpServer.Shutdown(SocketShutdown.Both);
        UdpServer.Disconnect(true);
        UdpServer.Close();

After I close it. and the I try to reconnect it with the same code as above, I get error:

Additional information: Only one usage of each socket address (protocol/network address/port) is normally permitted

I checked for exception during closing, but I didnt get any, i guessed they were closed properly, so actually, what is causing this problem? Please help!

Upvotes: 11

Views: 15122

Answers (3)

Miebster
Miebster

Reputation: 2404

For reference, in case anyone else stumbles onto this question but looking for the UdpClient implementation.

int port = 1234;
var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
var endPoint = new IPEndPoint(IPAddress.Any, port);
socket.Bind(endPoint);

var updClient = new UdpClient();
updClient.Client = socket;
updClient.Connect(_ipAddress, port);

Upvotes: 0

Jasim Khan Afridi
Jasim Khan Afridi

Reputation: 776

I got answer.... I need to use this after decleration of socket...

socket.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.ReuseAddress, true);

Upvotes: 17

Paul Farry
Paul Farry

Reputation: 4768

You could look at this 2 ways.

  1. Don't actually Receive whilst your are in your stopped state, just in your BeginReceive, just drop/ignore the data

  2. If you really need to recreate the socket, then don't perform the disconnect on your Server because you haven't actually got a connection. Your disconnect is throwing

System.Net.Sockets.SocketException (0x80004005): A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied

Upvotes: 0

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