code: private static boolean isPortOpen(InetAddress pAddress, int pPort) {
          Socket socket = null;
          try {
              socket = new Socket();
              socket.setReuseAddress(true);
              SocketAddress sa = new InetSocketAddress(pAddress, pPort);
              socket.connect(sa, 200);
              return socket.isConnected();
          } catch (IOException e) {
              return false;
          } finally {
              if (socket != null) {
                  try {
                      socket.close();
                  } catch (IOException e) {
                      // Best effort. Hate that close throws an IOException, btw. Never saw a real use case for that.
                  }
              }
          }
      }
docs: Check a port by connecting to it. Try only 200ms.