Dashbord error "You are not authorized to access /syspanel/"

Hello,

I've just completed Horizon installation successfully and I've been able to connect it as reported in the manual http://docs.openstack.org/trunk/openstack-compute/install/content/ch_install-dashboard.html.

However, whenever I select any link, I am redirect to the login page with error "Error: You are not authorized to access /syspanel/..."

I've already tested what's suggested here http://<email address hidden>/msg08286.html but things are even worse.

I get a traceback in the browser.

Could you indicate what to do to proceed?

Thanks.