Question

When running a ServerSocket on a machine A with ip 145.74.217.109
And then trying to connect to machine A using machine B with ip 145.74.219.103 I am unable to connect.
But when using machine C with ip 145.74.217.180 it works.

Iam not sure if this is solvable in code or its just network settings. If It is network issues is there another way to go around this problem or would I need to go away from sockets to …?

Machine A:

public void run() {
        try {
            sock = new ServerSocket(Constants.PORT);
            for (;;) {
                Socket newsock = sock.accept();

                System.out.println("Accepting new player: ");

                new PaintballPlayer(newsock);
            }
        } catch (Exception e) {
            System.out.println("IO error " + e);
        }
        System.out.println("End!");

        try {
            sock.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

Machine B, C :

socket = new Socket(ip, Constants.PORT);

Answer 1

if you look at the IP us server has IP 145.74.217.109 IP with 145.74.217.180 are able to connect while 145.74.219.103 is not being able to connect it means subnet 145.74.219.X has no access to 145.74.217.X that is why it is not being able to connect. It is network setting ask you network administrator for that. Make your both machine have same subnet mask