Running neutron commands against RHEL-OSP4 while using neutronclient-2.3.9 fails with error "Unable to establish connection to http://localhost:35357/v2.0/tokens"

Issue

• I have Mac OS or Fedora client system where I have installed the latest version of neutronclient package (python-neutronclient-2.3.9). Running neutron commands against an RHEL-OSP4 system fails with below error.

#  neutron net-list
Unable to establish connection to http://localhost:35357/v2.0/tokens

• Debug output is given below.

# neutron -v net-list
DEBUG: keystoneclient.session REQ: curl -i -X GET http://10.65.216.20:35357/v2.0/ -H "Accept: application/json" -H "User-Agent: python-keystoneclient"
DEBUG: keystoneclient.session RESP: [200] CaseInsensitiveDict({'date': 'Fri, 31 Oct 2014 13:19:03 GMT', 'content-type': 'application/json', 'content-length': '613', 'vary': 'X-Auth-Token'}) 
RESP BODY: {"version": {"status": "stable", "updated": "2013-03-06T00:00:00Z", "media-types": [{"base": "application/json", "type": "application/vnd.openstack.identity-v2.0+json"}, {"base": "application/xml", "type": "application/vnd.openstack.identity-v2.0+xml"}], "id": "v2.0", "links": [{"href": "http://localhost:35357/v2.0/", "rel": "self"}, {"href": "http://docs.openstack.org/api/openstack-identity-service/2.0/content/", "type": "text/html", "rel": "describedby"}, {"href": "http://docs.openstack.org/api/openstack-identity-service/2.0/identity-dev-guide-2.0.pdf", "type": "application/pdf", "rel": "describedby"}]}}

DEBUG: stevedore.extension found extension EntryPoint.parse('table = cliff.formatters.table:TableFormatter')
DEBUG: stevedore.extension found extension EntryPoint.parse('csv = cliff.formatters.commaseparated:CSVLister')
DEBUG: neutronclient.neutron.v2_0.network.ListNetwork get_data(Namespace(columns=[], fields=[], formatter='table', max_width=0, page_size=None, quote_mode='nonnumeric', request_format='json', show_details=False, sort_dir=[], sort_key=[]))
DEBUG: keystoneclient.auth.identity.v2 Making authentication request to http://localhost:35357/v2.0/tokens
ERROR: neutronclient.shell Unable to establish connection to http://localhost:35357/v2.0/tokens
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/neutronclient/shell.py", line 691, in run_subcommand
    return run_command(cmd, cmd_parser, sub_argv)
  File "/usr/lib/python2.7/site-packages/neutronclient/shell.py", line 90, in run_command
    return cmd.run(known_args)
  File "/usr/lib/python2.7/site-packages/neutronclient/common/command.py", line 29, in run
    return super(OpenStackCommand, self).run(parsed_args)
  File "/usr/lib/python2.7/site-packages/cliff/display.py", line 91, in run
    column_names, data = self.take_action(parsed_args)
  File "/usr/lib/python2.7/site-packages/neutronclient/common/command.py", line 35, in take_action
    return self.get_data(parsed_args)
  File "/usr/lib/python2.7/site-packages/neutronclient/neutron/v2_0/__init__.py", line 669, in get_data
    data = self.retrieve_list(parsed_args)
  File "/usr/lib/python2.7/site-packages/neutronclient/neutron/v2_0/__init__.py", line 615, in retrieve_list
    neutron_client = self.get_client()
  File "/usr/lib/python2.7/site-packages/neutronclient/neutron/v2_0/__init__.py", line 398, in get_client
    return self.app.client_manager.neutron
  File "/usr/lib/python2.7/site-packages/neutronclient/common/clientmanager.py", line 39, in __get__
    self._handle = self.factory(instance)
  File "/usr/lib/python2.7/site-packages/neutronclient/neutron/client.py", line 35, in make_client
    instance.initialize()
  File "/usr/lib/python2.7/site-packages/neutronclient/common/clientmanager.py", line 113, in initialize
    httpclient.authenticate()
  File "/usr/lib/python2.7/site-packages/neutronclient/client.py", line 328, in authenticate
    interface=self.interface)
  File "/usr/lib/python2.7/site-packages/keystoneclient/session.py", line 529, in get_endpoint
    return auth.get_endpoint(self, **kwargs)
  File "/usr/lib/python2.7/site-packages/keystoneclient/auth/identity/base.py", line 192, in get_endpoint
    service_catalog = self.get_access(session).service_catalog
  File "/usr/lib/python2.7/site-packages/keystoneclient/auth/identity/base.py", line 126, in get_access
    self.auth_ref = self.get_auth_ref(session)
  File "/usr/lib/python2.7/site-packages/keystoneclient/auth/identity/v2.py", line 79, in get_auth_ref
    authenticated=False, log=False)
  File "/usr/lib/python2.7/site-packages/keystoneclient/session.py", line 430, in post
    return self.request(url, 'POST', **kwargs)
  File "/usr/lib/python2.7/site-packages/keystoneclient/utils.py", line 318, in inner
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/keystoneclient/session.py", line 332, in request
    resp = send(**kwargs)
  File "/usr/lib/python2.7/site-packages/keystoneclient/session.py", line 374, in _send_request
    raise exceptions.ConnectionRefused(msg)
ConnectionRefused: Unable to establish connection to http://localhost:35357/v2.0/tokens
Unable to establish connection to http://localhost:35357/v2.0/tokens

• The same command against the same environment works if I use neutronclient-2.3.5. How can I resolve this?