Unity multiplayer over internet does not work using port forwarding

I have tried multiplayer over LAN and it works perfectly fine. Then I tried multiplayer over internet using this tutorial.

http://www.paladinstudios.com/2013/07/10/how-to-create-an-online-multiplayer-game-with-unity/

It worked absolutely fine.

The key statements on server are

  Network.InitializeServer(4, 25000, !Network.HavePublicAddress());
     MasterServer.RegisterHost("typeName", "gameName");

While key statements on Client are

  MasterServer.RequestHostList("typeName");
 void OnMasterServerEvent(MasterServerEvent msEvent)
 {
     if (msEvent == MasterServerEvent.HostListReceived)
         hostList = MasterServer.PollHostList();
 }
 private void JoinServer(HostData hostData)
 {
     Network.Connect(hostData);
 }

Well in this process, using NAT punchthrough is used where Masterserver refers client and server and the connection continues via Network facilitator.

But I want to connect server and client without any intermediate server. Where in client, we just put the public ip address of the other computer and port no. on which game is running. Popular games like 'Terraria', 'Minecraft' work without intermediate servers . I have allowed the app through firewall and forwarded the port in router settings and still cannot see any service running on the port. I checked whether service was running using www.canyouseeme.org but it shows error: no service running.

Does unity provide such feature for connecting over internet without intermediate server?