I have a problem with the app engine backends instance, I am using django-nonrel and I tried the deferred.defer both in development and in production and here is the result: On Development (testing in my computer) the deferred.defer with _target:backend_name, worked and I could see that used the backend instance. On Production, deferred.defer didn't work, the backend instance is not starting, the _ah/start is giving the 500 error, with all the backend instance configuration that I tried (resident, dynamic, public, B1, B2, B4, etc) So I have no more ideas and I couldn't find anyone in the same situation as me, if anyone could help I appreciate. Please let me know if needed more information.
Regards
Fabio
Problem solved,
App engine was not finding the 404 page, once I solved this the backend worked.