Estou tentando resolver um erro de conexão lançado pelo AllAuth / Django 1.7 em execução no Google App Engine: acredito que o erro pode estar na configuração de Sessões, mas não consegui identificar o problema. A inscrição local está funcionando corretamente, mas os logons sociais geram um erro.

editar: O LinkedIn funciona bem.

editar: No servidor local; Recebo "deve ser _socket.socket, não socket" depois de inserir credenciais.

editar: Parece haver alguma ambiguidade no que o AppEngine atende a http ou https; embora a página seja https, o URI está sendo recebido como http.

editar: Meus pacotes por pip congelam:

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

Aqui está o meu 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'))