De mail net binnengekregen: We recently discovered a bug in the Let's Encrypt certificate authority code, described here: https://community.letsencrypt.org/t/2020-02-29-caa-rechecking-bug/114591 Unfortunately, this means we need to revoke the certificates that were affected by this bug, which includes one or more of your certificates. To avoid disruption, you'll need to renew and replace your affected certificate(s) by Wednesday, March 4, 2020. We sincerely apologize for the issue. If you're not able to renew your certificate by March 4, the date we are required to revoke these certificates, visitors to your site will see security warnings until you do renew the certificate. Your ACME client documentation should explain how to renew. If you are using Certbot, the command to renew is: certbot renew --force-renewal If you need help, please visit our community support forum: https://community.letsencrypt.org/t/revoking-certain-certificates-on-march-4/114864 Please search thoroughly for a solution before ...