Let’s Encrypt: Unexpected certificate warnings

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…

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