udp not receiving

i'm trying to make a networking script that will find all game servers on a LAN but i am running into some trouble; import System.Net.Sockets;

 private var udp_server:UdpClient;
 private var udp_client:UdpClient;
 private var udp_port:int = 18000;
 private var udp_broadcast_ip:IPAddress = IPAddress.Parse ("224.0.0.224");
 
 private var selected:boolean = false;
 
 private var udp_received_message:String;
 
 function StartServer(){
 
     udp_server = new UdpClient(udp_port, AddressFamily.InterNetwork);
     var udp_endpoint:IPEndPoint = new IPEndPoint(udp_broadcast_ip, udp_port);
     udp_server.Connect (udp_endpoint);
 
     InvokeRepeating("StartBroadcastUDP", 0.0,0.3);
 }
 
 function StartClient(){
     if(udp_client == null){
         udp_client = new UdpClient(udp_port);
         udp_client.BeginReceive(new AsyncCallback(StartReceiveUDP), null);
         Debug.Log("Searching for udp");
     }
 }
 
 function StartBroadcastUDP(){
     var udp_broadcast_message:String = "GAME SERVER";
 
     if(udp_broadcast_message != ""){
         udp_server.Send(Encoding.ASCII.GetBytes (udp_broadcast_message), udp_broadcast_message.Length);
     }
 }
 
 function StartReceiveUDP(result:IAsyncResult){
     Debug.Log("Searching for udp");
     var udp_endpoint:IPEndPoint = new IPEndPoint(IPAddress.Any, udp_port);
     var udp_received_message_byte:byte[];
 
     if(udp_client != null){
         udp_received_message_byte = udp_client.EndReceive(result, udp_endpoint);
     }else{
         return;
     }
     
     udp_client.BeginReceive(new AsyncCallback(StartReceiveUDP), null);
     udp_received_message = Encoding.ASCII.GetString(udp_received_message_byte);
     Debug.Log("Searching for udp");
 }
 
 function Update(){
     if(udp_received_message != null){
         Debug.Log("Received Message: " + udp_received_message);
     }
 }
 
 function OnGUI(){
     if(!selected){
         if(GUI.Button(Rect(0, 0, 50, 50), "Server")){
             StartServer();
             selected = true;
         }else if(GUI.Button(Rect(50, 0, 50, 50), "Client")){
             StartClient();
             selected = true;
         }
     }
 }

it seams that when i start receiving udp (BeginReceive in Startclient) it just plan doesn't to id. to make sure it is the case i added a few debug.logs and still got nothing