I have many thousands of users and one who is reporting a problem I
can't diagnose. Unfortunately, I don't have detailed information but
I'm hoping the problem can trigger a suggestion from someone.
The user is authenticated with ClientLogin which my application
believes is successful. But then all further requests return 403.
And that's all I know right now. The user is able to log in with a
different account so it's not environmental and authentication is
working for (literally) the other 99.9% of my users. I do handle
Captcha challenges (which this user isn't reporting) and I had the
user change their password in the hopes that it would reset a
challenge flag or something. The user is able to access Google Reader
through the web. It's probably not relevant but the user is in Israel.
(I'm grasping here.)