title: Socket connections being dropped
body: <p>I have created a port scanner with multi-threading that scans ports, starting at 1 and going up in numbers.
  It works great on my LAN but if I try to scan an IP outside of my LAN it says all ports are closed, which I assume is because the firewall is blocking the connection?</p>
  
  <p>Is there any way to check if the port is open on an IP address outside my LAN? This is the code I've got</p>
  
  <pre><code>for (int port = startPort; port &lt; 65535; port+=PortScanner.count) 
          {
              Socket socket;
                  try 
                  {
                      socket = new Socket();
                      socket.connect(new InetSocketAddress(host, port ), 500);
  
                      openPorts.add(port);
  
                      foundPort = true;
                      String temp = "Port " + port + " is open.\n";
                      System.out.write(temp.getBytes());
  
                      socket.close();
                  }
                  catch (IOException ioEx) 
                  {
                      System.out.println("Port " + port + " is closed");
                  }
           }
           Thread.yield();
  </code></pre>