Estoy tratando de resolver un error de conexión lanzado por AllAuth / Django 1.7 que se ejecuta en Google App Engine: creo que el error puede estar en la configuración de Sesiones, pero no he podido identificar el problema. El registro local funciona correctamente, pero los inicios de sesión sociales arrojan un error.

editar: LinkedIn funciona bien.

editar: En el servidor local; Obtengo "debe ser _socket.socket, no socket" después de ingresar las credenciales.

editar: Parece haber cierta ambigüedad con respecto a qué AppEngine sirve http o https; aunque la página es https, el URI se recibe como http.

editar: Mis paquetes por pip se congelan:

AppEngine-Email-Backend==1.0
Django==1.7.2
GoogleAppEngineCloudStorageClient==1.9.15.0
MySQL-python==1.2.4b4
bootstrap-admin==0.3.3
django-allauth==0.19.0
django-appengine-toolkit==0.2.1
django-crispy-forms==1.4.0
django-localflavor==1.1
djangoappengine==1.6.3
djangotoolbox==1.6.2
mysqlclient==1.3.4
oauthlib==0.7.2
python-openid==2.2.5
requests==2.5.1
requests-oauthlib==0.4.2
wsgiref==0.1.2

Aquí está mi rastro:

Request Method: GET
Request URL: https://[app].appspot.com/accounts/google/login/callback/?state=LrL6Pw08bT7r&code=4/Og6R5AWIQX9WFGyF7XsXAVJHfbyBLRbIqxnflCyS2Kg.omD5uljwob8dPm8kb2vw2M1dUc7elQI

Django Version: 1.7.2
Python Version: 2.7.5
Installed Applications:
('bootstrap_admin',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.sites',
 'django.contrib.admindocs',
 'django.contrib.sitemaps',
 'django.contrib.flatpages',
 'appengine_toolkit',
 'djangoappengine',
 'localflavor',
 'crispy_forms',
 'allauth',
 'allauth.account',
 'allauth.socialaccount',
 'allauth.socialaccount.providers.google',
 'supplier',
 'main')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'django.contrib.flatpages.middleware.FlatpageFallbackMiddleware')


Traceback:
File "/base/data/home/apps/s~[app]/3.381542196672942284/django/core/handlers/base.py" in get_response
  111.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/base/data/home/apps/s~[app]/3.381542196672942284/site_packages/allauth/socialaccount/providers/oauth2/views.py" in view
  54.             return self.dispatch(request, *args, **kwargs)
File "/base/data/home/apps/s~[app]/3.381542196672942284/site_packages/allauth/socialaccount/providers/oauth2/views.py" in dispatch
  109.             access_token = client.get_access_token(request.GET['code'])
File "/base/data/home/apps/s~[app]/3.381542196672942284/site_packages/allauth/socialaccount/providers/oauth2/client.py" in get_access_token
  57.                                 data=data)
File "/base/data/home/apps/s~[app]/3.381542196672942284/site_packages/requests/api.py" in request
  49.     response = session.request(method=method, url=url, **kwargs)
File "/base/data/home/apps/s~[app]/3.381542196672942284/site_packages/requests/sessions.py" in request
  461.         resp = self.send(prep, **send_kwargs)
File "/base/data/home/apps/s~[app]/3.381542196672942284/site_packages/requests/sessions.py" in send
  573.         r = adapter.send(request, **kwargs)
File "/base/data/home/apps/s~[app]/3.381542196672942284/site_packages/requests/adapters.py" in send
  415.             raise ConnectionError(err, request=request)

Exception Type: ConnectionError at /accounts/google/login/callback/
Exception Value: ('Connection aborted.', error(13, 'Permission denied'))