Question

I’m trying to get two instances of my program to communicate between them. I’ve been referred to udp, and so I’m trying to run the example from here: http://msdn.microsoft.com/en-us/library/system.net.sockets.udpclient%28v=VS.100%29.aspx
But I get an error:
“socketexception (0x80004005): This is usually a temporary error during hostname resolution…”

how do I solve this?

I don’t know anything about this stuff. I googled for what I needed and found this here:

//This is how you do it (kudos to sipwiz)
    UdpClient udpServer = new UdpClient(localpt); //This is what the proprietary(see question) sender would do (nothing special) 

    //!!! The following 3 lines is what the poster needs...(and the definition of localpt (of course))
    UdpClient udpServer2 = new UdpClient();
    udpServer2.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
    udpServer2.Client.Bind(localpt);

Thanks

Answer 1

The issue is you are using the code for the sample unmodified.

This is trying to connect to AlternateHostMachineName which does not exist, and therefore throws a 0x80004005: No such host is known exception.

You need to amend the code to connect to a real server.