Last night beginning at around 5:30PM PDT (GMT-7) authentication using
Google Apps for your Domain failed with Google App Engine apps, and
the Google App Engine Admin console (
http://appengine.google.com/a/
YOURDOMAIN). When attempting to sign in using a Google Apps for your
Domain account, users received an error. This did not affect
applications using Google Accounts authentication. As of 10:30AM PDT
normal service has been restored to all users.