Thread: Client / Server connection not working except localhost

I created a server and a client and it's working with localhost. But when using any IP except localhost for the client it won't work. I tested it with both LAN and Hamachi. When using my own Hamachi IP it also won't work, that's why I think it has nothing to do with port forwarding or something like that.


This is the initialisation code for my server:

public static void init()
    	{
    		try
    		{	
    			serverSocket = new ServerSocket(port, 4, InetAddress.getByName("localhost"));
    			new ClientThread(serverSocket); // The thread that's sending the data, not important for my problem, because I can't even connect to the server
    		}
    		catch (IOException e)
    		{
    			e.printStackTrace();
    		}
    	}

And the client code:

public static void init()
    	{
    		try
    		{
    			clientSocket = new Socket(serverIP, port);
    			System.out.println("Connected!\nBuffering...");
    			in = new ObjectInputStream(clientSocket.getInputStream());
    			out = new ObjectOutputStream(clientSocket.getOutputStream());
    			String name = "Client "+new Random().nextLong();
    			Client.name = name;
    			System.out.println("Buffered\nPinging for 256 bytes...");
    			out.writeObject(name.getBytes());
    			out.flush();
    			long latency = in.readLong();
    			System.out.println("Latency: "+(System.currentTimeMillis()-latency));
 
    			System.out.println("Starting threads...");
    			new ThreadSend(out);
    			new ThreadReceive(in);
    		}
    		catch (IOException e)
    		{
    			e.printStackTrace();
    		}
    	}

Are there any errors in my code or is it something else?