Today Let’s Encrypt announced that all certificates verified through a TLS-ALPN-01 challenge and created between October 29, 2021 and 00:48 UTC January 26, 2022 will be revoked at 16:00 UTC on January 28.
Traefik Proxy and Traefik Enterprise users with certificates that meet these criteria must force-renew the certificates before that time. If the certificates are not renewed, visitors to any property secured by a revoked certificate may receive errors or warnings until the certificates are renewed.
Check out our step-by-step instructions to determine if you are affected by this event, and how to update certificates for both Traefik Proxy and Traefik Enterprise.
If you have questions, please post them to this topic so that we can get back to you as quickly as possible.