Let’s Encrypt has been proud to work with the IETF to maintain ACME as an open standard since we first developed the technology a decade ago. We’re happy to announce that IETF has published our latest addition to the ACME protocol, ACME Renewal Information (ARI), as RFC 9773. ARI helps keep the renewal process reliable during unexpected events affecting certificate validity. Since the ACME protocol was first published as RFC 8555, the IETF ACME working group has remained active, defining ...
