A problem with python drupal services

Hi i try to run this code on Drupal 6.x but i get an error :
A fault occurred
Fault code: 1
Fault string: Wrong username or password.
can some body already try python to access with Drupal xmlrpc and to get authentificate

#

import xmlrpclib, time

Put the URL for your Service in here. See admin/build/services.

config = {
'url': 'http://twitter.connexionservice.com/services/xmlrpc',
'username': 'developer',
'password': 'password',
}
s = xmlrpclib.Server(config['url'], allow_none=True)
class node:
# You need to set uid and username appropriately for your site if you don't want
# everything to be posted by Anonymous.
def init(self, title, body, path, ntype='twitterpost', uid=3, username='dofbi'):
self.title = title
self.body = body
self.path = path
self.type = ntype
self.uid = uid
self.name = username
self.promote = False

try:
connection = s.system.connect()
session = s.user.login(connection['sessid'], config['username'], config['password'])
sessid = session['sessid']
# Here you could read in the content for each node from some other source and do
# n = node(title, body, path)
# but for now we'll just do:
n = node('A test node', 'This is an interesting page', 'interesting')
# and then save it into Drupal
s.node.save(sessid, n)
# where it should appear at /interesting.

except xmlrpclib.Fault, err:
print "A fault occurred"
print "Fault code: %d" % err.faultCode
print "Fault string: %s" % err.faultString