Hi,
We got some monitoring alerts that CentOS Stream 9 build infra is actually unreachable. We have an internal ticket open at Red Hat to investigate the issue (seems network related)
If you're directly consuming pkgs from that infra (like https://kojihub.stream.centos.org) it's actually unreachable.
That means that it also impacts downstream buildsystems, like https://cbs.centos.org, but only if you asked to consume directly pkgs from teh CentOS Stream 9 buildroot. For SIGs only building against content from mirror.stream.centos.org, builds should continue to work.
We'll update this thread when we'll have more information.