letsencrypt topic about this issue: https://community.letsencrypt.org/t/solution-client-with-the-currently-selected-authenticator-does-not-support-any-combination-of-challenges-that-will-satisfy-the-ca/49983/2
This is due to a security incident with LetsEncrypt
Incident Status Security Issue
Components acme-v01.api.letsencrypt.org (Production), acme-staging.api.letsencrypt.org (Staging), acme-staging-v02.api.letsencrypt.org (Staging)
Locations High Assurance Datacenter 1, High Assurance Datacenter 2
Soundcloud recently changed their streaming format from 128kbps MP3 to 64kbps Opus. This drastically reduces the audio quality and can introduce strange artifacts. I made & released a Chrome Extension to restore the 128kbps MP3s. Give it a try.
Let’s see what support says…
[Errno -1] repomd.xml does not match metalink for epel
Trying other mirror.
yum clean all rm -rf /var/cache/yum
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