Let's Encryptが発行した証明書の2.6%を失効させる必要ができてしまったそうだ。失効させるのはUTCで3月4日。影響を受ける証明書の発行時にメールアドレスが提供されていた場合には通知を送るとのことです。
Revoking certain certificates on March 4 https://community.letsencrypt.org/t/revoking-certain-certificates-on-march-4/114864
community.letsencrypt.orgRevoking certain certificates on March 4Due to the 2020.02.29 CAA Rechecking Bug, we unfortunately need to revoke many Let’s Encrypt TLS/SSL certificates. We’re e-mailing affected subscribers for whom we have contact information. This post and thread will collect answers to frequently asked questions about this revocation, and how to avoid problems by renewing affected certificates early. If you’re affected, please: thoroughly read this thread, and search the community forum, for an answer to your question. If you don’t find one, ple...