I'm having the same problems on a production website.
It has several hundreds of visitors each days and this error occurs
occasionally (more or less 1-3 times a week).
Looking at the logs I see it is an actual visitor doing 'normal'
things.
I also saw a visitor that had it several times in a short period (with
different authenticity tokens).

I can't seem to find the reason.
We're using the database for storing the sessions
(ActionController::Base.session_store = :active_record_store).
We're using a 128 character session key.

Any ideas?

Thanks
Matthias

On Oct 8, 10:40 pm, drewB <[email protected]> wrote:
> A few times a week we get an
> ActionController::InvalidAuthenticityToken exception from our app (not
> all from the same action or controller).  I understand why
> protect_from_forgery exists and am not interested in disabling it.  I
> am quite certain this is not from actual attacks on our site but not
> sure why users are consistently triggering it.  The number of users it
> impacts is very small but still would be nice to know how to reduce
> them or at least why it is happening.
>
> Any ideas?
>
> Thanks,
> Drew

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