need assistance multicast udp server find c#

as kind followup i've gotten fortitude operative internal machine, nonetheless accessory network.

i don't know too many sockets basics, bear me. idea fan feeling server internal network, outcome cut/paste/edit code.

this fan code:

ipendpoint ipep = new ipendpoint(ipaddress.parse("127.0.0.1"), 10294);

    byte[] information = new byte[1024];
    open form1()
    {
        initializecomponent();

    }

    private vacant button1_click(object sender, eventargs e)
    {

        dale fan = new socket(addressfamily.internetwork, sockettype.dgram, protocoltype.udp);
        client.setsocketoption(socketoptionlevel.ip, socketoptionname.multicasttimetolive, 10);
        twine acquire = "what's your ip?";
        information = encoding.ascii.getbytes(welcome);
        client.sendto(data, data.length, socketflags.none, ipep);
        ipendpoint server = new ipendpoint(ipaddress.any, 0);
        endpoint tmpremote = (endpoint)server;
        information = new byte[1024];
        int recv = client.receivefrom(data, ref tmpremote);
        this.ip.text = ((ipendpoint)tmpremote).address.tostring(); //set textbox
        this.port.text = encoding.ascii.getstring(data, 0, recv); //set textbox
        client.close();
    }

this server code:

int recv;
        byte[] information = new byte[1024];
        ipendpoint ipep = new ipendpoint(ipaddress.any, 10294);
        dale newsock = new socket(addressfamily.internetwork,
                sockettype.dgram, protocoltype.udp);
        newsock.bind(ipep);
        newsock.setsocketoption(socketoptionlevel.ip, socketoptionname.addmembership, new multicastoption(ipaddress.any,ipaddress.parse("127.0.0.1")));

        while (true)
        {
            console.writeline("waiting client...");
            ipendpoint sender = new ipendpoint(ipaddress.any, 0);
            endpoint tmpremote = (endpoint)(sender);
            information = new byte[1024];
            recv = newsock.receivefrom(data, ref tmpremote);
            console.writeline("message viewed {0}:", tmpremote.tostring());
            console.writeline(encoding.ascii.getstring(data, 0, recv));
            twine acquire = "7010";
            information = encoding.ascii.getbytes(welcome);
            newsock.sendto(data, data.length, socketflags.none, tmpremote);
        }

it works internal accessory (both server client) nonetheless i try another accessory same network i "an existent tie forcibly closed remote host"

i comprehend i need supplement lot try/catch nonetheless i'm only perplexing hoop works first.