Xavier ,  Can you add to wiki page bugzilla ( http://rpmfusion.org/ReportingBugs ) ?  In page age http://rpmfusion.org/ReportingBugs we should read : You should install CACert root certificate to successfully validate bugzilla's certificate. UPDATE: to fix: Python client - SSL lib - certificate verify failed in F23 (for fedora-review for example) cd /etc/pki/ca-trust/source/anchors wget http://www.cacert.org/certs/root.crt update-ca-trust More references in  https://ask.fedoraproject.org/en/question/47794/is-bugzillarpmfusionorg-s... Thanks, -- Sérgio M. B.