NAT ignored

It seams like NAT is ignored, even if I initialize the server with useNat to true, the element.useNat is always false any guesses?

 if(GUI.Button(Rect (xAmount+80, yAmount+140, 120,20), "Host Game")){
     creatingNewHostGame = false;
     HostNewGameButton.text = "Host New Game";
     
     Network.InitializeSecurity();
     if(password != "")
         Network.incomingPassword = password;
     var info : NetworkConnectionError = Network.InitializeServer(MaxPlayers - 1, serverPort, useNAT);
     MasterServer.RegisterHost(gameName, hostGameName, hostGameDescription);
     Debug.Log(info);
     LobbyGUI.menuCounter = 0;
 }

 for (var element : HostData in hostData){
         counter++;x = (counter-1) * 100;
         GUILayout.BeginHorizontal();
         hostNat = "";hostInfo = "";
         hostNat = element.useNat.ToString();
         for(var host in element.ip)
             hostInfo += host + " / " + element.port + " / " + hostNat; 
         GUI.color = Color.white;
         GUI.DrawTexture(new Rect(0, x, 300, 80), rowTexture, ScaleMode.ScaleToFit, true, 0);
         GUI.color = Color.black;
         GUI.Label(new Rect(0, x, 300 , 30), "Game Name : " + element.gameName);GUI.Label(new Rect(0, x + 15, 300 , 30), "Description : " + element.comment);
         GUI.Label(new Rect(0, x + 30, 300, 30), "Players : " + element.connectedPlayers + " / " + element.playerLimit);
         GUI.Label(new Rect(0, x + 45, 300, 30), "Private : " + element.passwordProtected);GUI.Label(new Rect(0, x + 60, 300, 30), "IP/Port/NAT : " + hostInfo);
         GUI.color = Color.white;
         if(GUI.Button(new Rect(0,x + 80, 80, 18), "Join")){
             LobbyGUI.menuCounter = 1;
             if(element.useNat){
                 Debug.Log("Connected with NAT");
                 if(element.passwordProtected)
                     Network.Connect(element.guid, tempPassword[counter - 1]);
                 else Network.Connect(element.guid);
             }else{
                 Debug.Log("Connected without NAT");
                 if(element.passwordProtected)
                     Network.Connect(element, tempPassword[counter - 1]);
                 else Network.Connect(element);
             }
         }if(element.passwordProtected){
             tempPassword[counter - 1] = GUI.TextField(new Rect(82,x + 80, 300 - 80, 18), tempPassword[counter - 1]);
         }GUILayout.EndHorizontal();    
     }