(Edit: June 12, 2021 (Japanese Time: June 13 morning))
Some ZeroSSL were revoked on June 11, 2021.
We have already seen the related posts.
However, Firefox is mainly affected. Chrome also delays sending a revoked certificate error.
Edge (Chromium based) are not affected by this.
It may not have been noticed by you for a while.
Supports revoked certificate renewal in Caddy v2.4.2.
But their Caddy developers haven’t been able to test these.
If you need to renew your certificate now
If your Caddy has few admin domains, manually delete the certificate directory and restart Caddy.
- https://caddy.community/t/sec-error-revoked-certificate-in-firefox/12750/3
- https://caddy.community/t/zerossl-acme-api-response-deterioration-information/12670/7
If your Caddy has a lot of admin domains, apply the batch module to Caddy:
As I have already commented, There is a way around the reference issue in Firefox