Hi,

I had the same problem and just found the solution.

My token was no longer valid, which means your app has to invalidate
the token in the cache itself and redo the request with the new token.

http://stackoverflow.com/questions/3919071/what-is-the-proper-url-to-get-an-auth-cookie-from-a-gae-based-application/3929312#3929312

Cheers,
Gabriel

On Sep 12, 10:55 am, Lior Harsat <[email protected]> wrote:
> Hi,
>
> I have an android application that authenticates to the app engine with the
> a google account.
> I am experiencing a very annoying issue.
> Once in a while I start getting status 500 when posting /_ah/login?... to my
> app.
> I just get the regular server error message :
>
> "Error: Server Error
> The server encountered an error and could not complete your request.
>
> If the problem persists, please 
> report<http://code.google.com/appengine/community.html> your
> problem and mention this error message and the query that caused it."
>
> currently I am unable to get non 500 status from app engine.
> This is not the first time this has happened and it just goes away by itself
> after more than a few hours.
> The app engine status page does not show there is any issue.
> The last time this happened, I did see a few posts in this group and in app
> engine java group about this issue but there was no response by any Googler.
>
> Is anyone using Google authentication on a production environment?
> Is it flakey as it seems?
> Any help will be appreciated (before I re write my authentication process).
>
> Thanx,Lior

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