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 of the link above:

  • Ensure that the involved systems trust theISRG 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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FortiGuard DNS Rating Server (SDNS) unavailable

Last update from 12.05.2021 at 09:40 Swiss local time: We have noticed an improvement in the situation. Some rare rating timeouts still show up from time to time, but the majority of requests are being answered correctly. Also the DNS servers are working as usual again.

We have noticed an increase of support requests regarding the FortiGuard DNS rating service (SDNS) today. Therefore we want to inform you about the following issue.

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