ikkeben
Verified User
DST Root CA X3 Expiration (September 2021) - Let's Encrypt
Update Feb 05, 2024 It’s been two years, and the Android compatibility cross-sign mentioned below is close to expiring. See our recent blog post for a detailed explanation of the changes coming over the course of 2024. Update September 30, 2021 As planned, the DST Root CA X3 cross-sign has...
letsencrypt.org
Take a look other to old devices then android also with newer openssl.
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On September 30, there will be a change in how older browsers and
devices trust Let's Encrypt certificates, resulting in a minor decrease
in compatibility. If you run a typical website, you won't notice a
difference. Devices and browsers running up-to-date software will
continue working fine, and we've taken steps to make sure the vast
majority of older devices will too. If you run a large website, or need
to support less common software (particularly non-browser software),
you'll want to read about the details at:"