Let’s Encrypt: Unexpected certificate warnings

On Mai 2021, Let’s Encrypt issued a note about the expiration of their DST Root CA X3:

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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