Network.Connect Fails To Connect

I'm making a Script that will scan for servers on LAN so the user wont have to type in the IP themselfs. But i have run into an error. OnFailedToConnect() is not called when network.connect cant connect to a server. Code:

//this is where is scans

var ConnectionTries : int;

var IPString : GameObject;

function ConnectToServer () {

ConnectionTries++;

 if (ConnectionTries < 1000) {

 IP = "192.168.1." + ConnectionTries;

 Debug.Log(IP);

     var error : NetworkConnectionError = Network.Connect(IP,Port);

     Debug.Log(error);

     }

 }

function OnFailedToConnect(error: NetworkConnectionError) {

     Debug.Log("failed");

 }