Open Stack

Goodmorning every one,
i'm finally approaching migration to keystone v3 but i want to maintain keystone v2 compatibility for all users that have custom scripts for authentication to our openstack.
Migration seems to be pretty simple, change endpoint direct into database changing http://keystone:5000/v2.0 to http://keystone:5000 <http://keystone:5000/>; Openstack client have the capability to add /v2.0 or /v3 at the end of url retrieved from catalog.
But i'm stuck with horizon dashboard, login works but compute information are not available and error log show:
“ Forbidden: You are not authorized to perform the requested action: rescope a scoped token. (HTTP 403)"
All other tabs works properly.
I think that is a keystone issue but i don't understand why with openstack client works perfectly and with horizon not.
Anyone can explain what i missed in migration?

Thanks a lot,
Davide Panarese
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