Failed to connect master server

I've had a problem for day. I've been trying to make a system where the user acts as a host for a game. Is It true that I can't make it without buying the Pro-license? The only thing I've been able to make is a LAN-game.

Error: Failed to connect master server

 var playerPrefab : GameObject;
 var spawnObject : Transform;
 
 var gameName : String = "level1";
 private var refreshing : boolean = false;
 private var hostData : HostData[];
 
 var DatabaseObject : GameObject;
 static var LuodaanHahmo : boolean = false;
 
 var connected : boolean;
 var ipAddress : String;
 var ownIP : String;
 var gameIP : String;
 var port : int;
 function OnGUI () {
 
 if(!Network.isClient && !Network.isServer) {
 
      if (GUI.Button(Rect(Screen.width/2,Screen.height/2,100,20),"Start Server")) {
             startServer();
     }
 
      if (GUI.Button(Rect(Screen.width/2,Screen.height/2 + 30,100,20),"Refresh Hosts")) {
             Debug.Log("Refresh");
             refreshHostList();
     }
         if(hostData) {
          for(var i:int = 0; i<hostData.length; i++) {
     
             if(GUI.Button(Rect(Screen.width/2,Screen.height/2 + 60,100,20),hostData[i].gameName)) {
                 Network.Connect(hostData[i]);
         }
     }
 
 }
 
 
 }
 
 
 }
 
 
 function Update () {
 
     if(refreshing) {
         if(MasterServer.PollHostList().Length > 0) {        
         refreshing = false;
         Debug.Log(MasterServer.PollHostList().Length);
         hostData = MasterServer.PollHostList();
         
         
         }
     
     
     }
     if(LuodaanHahmo) {
             Database.charactersInGame[0] = new Character(PersonalData.AnnettuNimi, PersonalData.AloitusRaha, 4, 0, true, 0, 999999, 0, 10, 10, 10, 10, 10, 18);
             LuodaanHahmo = false;
     }
     ipAddress = MasterServer.ipAddress;
 
 }
 
 
 function startServer () {
 
     var useNat = !Network.HavePublicAddress();
     Network.InitializeServer(1,port, useNat);
     MasterServer.RegisterHost(gameName, "Tutorial Game", " this is a tutorial");
 }
     
     
     
 function OnServerInitialized () {
 
     Debug.Log("server initialized");
     spawnPlayer();
     DatabaseObject.active = true;
 }
 
 function OnConnectedToServer () {
     connected = true;
     spawnPlayer();
 
 
 }
 
 function OnDisconnectedFromServer() {
      connected = false;
  }
 function spawnPlayer () {
 
     Network.Instantiate(playerPrefab, spawnObject.position, Quaternion.identity, 0);
 
 }
 
 function OnMasterServerEvent(mse:MasterServerEvent) {
 
     if(mse == MasterServerEvent.RegistrationSucceeded) {
     Debug.Log("Registered Server");
     
     }
     
 }
     
     
 function refreshHostList () {
 
     MasterServer.RequestHostList(gameName);
     refreshing = true;
 
     
     
 }