Закрыть listening порт

Чем плоха наивная реализация?

class ListenerThread extends Thread
{
    private ServerSocket serverSocket;
    public void enable() throws IOException
    {
        serverSocket = new ServerSocket(1337);
        start();
    }
    public void disable() throws IOException
    {
        serverSocket.close();
        interrupt();
    }
    @Override
    public void run()
    {
        try
        {
            serverSocket.accept();
        }
        catch (IOException ex)
        {
            ex.printStackTrace();
        }
    }
}

netsh advfirewall firewall add rule name="Block12000" protocol=TCP dir=in localport=12000 action=block