Have you tried putting AllowExpiredCerts Yes
into /etc/cups/client.conf ? I had the same issue with Xerox WorkCentre 7220 and this did the trick. The printer's TLS certificate expired: openssl x509 -in /var/spool/cups/tmp/.cups/ssl/<printer.crt> -text showed: Not After : Aug 28 16:18:54 2021 GMT -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1886653 Title: cups-pki-expired To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1886653/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs