Letsencrypt is going to revoke 3,048,289 certificates tomorrow that "may" have been wrongfully issued due to a wrong CAA DNS check.
To check if you're affected, and need to re-issue certs (before tomorrow!), check here:
https://letsencrypt.org/caaproblem/
Why is this step necessary? mastodon.kleph.eu might not be the server where you are registered, so we need to redirect you to your home server first. Don't have an account? You can sign up here
mastodon.kleph.eu