Let’s Encrypt found some trouble with their certificate validation that used the `tls-alpn-01’ challenge scheme of the ACME protocol. It seems severe enough that they decided to revoke all certificates issues with this method on January 28, 2022. This is rather drastic, but they usually know what they are doing. But still, a 5 day heads up on this has many people scrambling. They offer help on renewing your certificates on their community forum. Which is a nice place with many helpful peo...
