Infinite redirect loop after adding "login: admin" to app.yaml

[npierfm]

Hello,
my app was running smoothly until I added:
login: admin or login: required
in my app.yaml

- url: /.*
script: controller.py
login: admin

This app (npiermap.appspot.com) works great on the dev server (even
with login: admin) and works great live, as long as I do not have any
"login" config to app.yaml.

I have seen the posts about the known bug associated with google apps
but I do not have a Google Apps account associated with the google
account that npiermap uses.

I observe this issue on multiple machines, browsers etc. I have
cleared all cache etc. No luck.

Anyone have any suggestions?

[Geoffrey Spear]

You need to handle requests to _ah/login_required; since you have a .*
mapping that requires logins, the page on which users would be logged
it itself requires the users to already be logged in.