Python - Problemas de socket (error: [Errno 111] Connection refused)

#import httplib2

import socket

from threading import Thread

import make_html

import make_html2

import os.path

#import gtk

#import grafico2

# creamos un objeto grafico2

#hello = grafico2.HelloWorld()

def Call_Rachael(torachael, tema, original_sentences, urlpath, Extractors):

	t = Thread(target=socket_, args=(torachael, tema, original_sentences, urlpath, Extractors,))

	t.start()

	return 0

def socket_(torachael, tema, original_sentences, urlpath, Extractors):

	HOST = 'localhost'

	PORT = 5556

	s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

	try:

		s.connect((HOST, PORT))

		s.send(torachael)

		data = s.recv(1024)

		if data == "":

			data = s.recv(1024)

		summary = ''

		if os.path.isfile(tema+'~resumen.txt'):

			summary = os.path.abspath(tema+'~resumen.txt')

			make_html.Making_html(tema, urlpath, original_sentences, summary, Extractors)

			print 'comienzo del segundo resmen'

			make_html2.Making_html(tema, urlpath, original_sentences, summary, Extractors)

			print '--------------------------------------DONE-------------------------------------'

			#hello.main()

		else:

			print "Error summary not found!..."

			return 1

		print "Socket Receive back "+data

		return 0

	finally:

		print "Cerramos el socket"

		s.close()

Exception in thread Thread-1:Traceback (most recent call last):

  File "/home/juancz/NetBeansProjects/Kukulkan-Ladislao/build/lib/jython-standalone-2.7-b1.jar/Lib/threading.py", line 184, in _Thread__bootstrap

    self.run()

  File "/home/juancz/NetBeansProjects/Kukulkan-Ladislao/build/lib/jython-standalone-2.7-b1.jar/Lib/threading.py", line 175, in run

    self._target(*self._args, **self._kwargs)

  File "lib/python/socket_.py", line 28, in socket_

    s.connect((HOST, PORT))

  File "<string>", line 1, in connect

  File "/home/juancz/NetBeansProjects/Kukulkan-Ladislao/build/lib/jython-standalone-2.7-b1.jar/Lib/socket.py", line 180, in set_last_error

    return method(obj, *args, **kwargs)

  File "/home/juancz/NetBeansProjects/Kukulkan-Ladislao/build/lib/jython-standalone-2.7-b1.jar/Lib/socket.py", line 171, in map_exception

    raise _map_exception(jlx)

error: [Errno 111] Connection refused