this may be a problem on how the application tries to reestablish a
connection with the server when the server side session has expired.
Could you try to use the debug version (index_debug.html instead of
index.html) in order to have a more useful error log?
Regards,
Giulio Cesare
But if you are inside a deferred chain, this would not be very informative.
I will try to give it a try as soon as I find some time.
Regards,
GIulio Cesare