https://letsencrypt.org/2023/07/10/cross-sign-expiration.htm...
(There are Android compatibility changes that will affect anybody using Let's Encrypt certificates which are consumed by older unsupported Android devices.)
- Android devices which needed the cross-sign compatibility dropped to 6.1%.
- “dropping the cross-sign will reduce the number of certificate bytes sent in a TLS handshake by over 40%.”
- “it will significantly reduce our operating costs”
Too bad for those who use their old Android devices to access the public library and can’t afford to upgrade.
It’s not ideal, but using Firefox Mobile to access Libby web app should still work?