[ovirt-users] grafana @ ovirt 4.5.0.6 "origin not allowed"

Hello, in my current new installation ovirt-engine-4.5.0.6-1.el8.noarch I have a problem setting up the grafana monitoring portal. I'm supposing that there is some problem regarding connection to ovirt DWH DB. I tested the credentials stored in /etc/grafana/conf/provisioning/datasources/ovirt-dwh.yaml of the ovirt-engine and with psql it seem to work and also the DWH is populated by the engine. But connecting to configuration->data sources and trying to reconfigure the ovirt dwh datasource, when you click on "save & test" it appears a popup telling that the "origin not allowed". I cannot find anything in the grafana log or the httpd log. Can you help?