Downloading/unpacking requests>=1.1 (from -r /opt/stack/heat/requirements.txt (line 25))
Downloading/unpacking Routes>=1.12.3 (from -r /opt/stack/heat/requirements.txt (line 26))
Downloading/unpacking six>=1.5.2 (from -r /opt/stack/heat/requirements.txt (line 27))
  Downloading six-1.6.1-py2.py3-none-any.whl
Downloading/unpacking SQLAlchemy>=0.7.8,<=0.9.99 (from -r /opt/stack/heat/requirements.txt (line 28))
Cleaning up...
Exception:
Traceback (most recent call last):
  File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/pip/basecommand.py", line 122, in main
    status = self.run(options, args)
  File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/pip/commands/install.py", line 278, in run
    requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
  File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/pip/req.py", line 1197, in prepare_files
    do_download,
  File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/pip/req.py", line 1375, in unpack_url
    self.session,
  File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/pip/download.py", line 546, in unpack_http_url
    resp = session.get(target_url, stream=True)
  File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 395, in get
    return self.request('GET', url, **kwargs)
  File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/pip/download.py", line 237, in request
    return super(PipSession, self).request(method, url, *args, **kwargs)
  File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 383, in request
    resp = self.send(prep, **send_kwargs)
  File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 486, in send
    r = adapter.send(request, **kwargs)
  File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/pip/_vendor/requests/adapters.py", line 381, in send
    raise ProxyError(e)
ProxyError: Cannot connect to proxy. Socket error: [Errno -2] Name or service not known.