On Mai 2021, Let’s Encrypt issued a note about the expiration of their DST Root CA X3:
https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/
Now that this root certificate has expired (2021-09-30), your systems might issue a warning when connecting to sites using Let’s Encrypt certificates.
To fix this glitch on a general client, follow the instructions of the link above:
- Ensure that the involved systems trust the ISRG Root X1 CA
- If such systems depend on OpenSSL, ensure that they’re using at version 1.1.0 or later
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