Currently, when I was attempting to update cPanel, I was presented with the following notification:
yum.Errors.NoMoreMirrorsRepoError: failure: repodata/repomd.xml from bintray--ookla-rhel: [Errno 256] No more mirrors to try.
https://ookla.bintray.com/rhel/repodata/repomd.xml: [Errno 14] HTTPS Error 403 - Forbidden
Why can't I update cPanel?
At this time, if you are unfamiliar with the repository, we would suggest that you disable the RPM from your YUM configuration. Disable the repository permanently, so yum won't use it by default. Yum will then ignore the repository until you permanently enable it again:
yum-config-manager --disable bintray--ookla-rhel
Having trouble, you can review our guide to disabling RPMs;