Hi, I finally found a workaround to fix CBS issues when using python >= 2.7.9 (like Fedora 22 and above) https://bugzilla.redhat.com/show_bug.cgi?id=1231616 Though it's dirty, but it's no different from python 2.7.8 and older behavior. Starting python 2.7.9, python ssl standard module enable certificate verification by default, hence causing koji client to fail when interacting with CBS. What I do not get is why withe the same koki client I have no issues with Fedora Koji instance, and why it fails with CBS. People using F21 and older or CentOS, won't experience that issue. I suspect either a configuration or difference of server versions difference, so I'd like CBS admins to investigate that issue. Regards, H.