ZF7982 with VSZ-E and guest portal

unknown

Hi,
i have problem with ZF7982 and VSZ with 3.5.1.0.862.
I can't use guest portal,
after I enter password no matter proper or bad, portal is stuck ...
After some time i receive message on portal
"system is too busy, please try again".
 With R510 everything works fine.

Anyone met the same problem ?

Regards,
Piotr