private static boolean testConn(String host, int port)

    {

        // Java Socket default timeout value: 60000 milliseconds

        Socket  socket = null;



        try {

            socket  = new Socket(host, port) ;

             return true;



        } catch(ConnectException e){

            System.out.println("testConn ConnectException, host:"+host+", port:"+port);

            return false;

        } catch (IOException e) {

            System.out.println("testConn IOException, host:"+host+", port:"+port);

            return false;

        }catch (Exception e) {

            System.out.println("testConn Exception, host:"+host+", port:"+port);

            return false;

        }finally{

            try {

                socket.close();

            } catch (IOException e) {

                System.out.println("testConn socket close fail");

            }

        }

    }