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 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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FortiWeb v6.4.0 and Let’s Encrypt

FortiWeb v6.4 starts to support the integration with Let’s Encrypt. This allows you to automatically generate server certificates alleviating the need to upload private certificates.

The administration guide gives you some information on how to request those Let’s Encrypt certificates but in our opinion the configuration guidelines are not sufficient.
So we tried to give some more information on how to configure FortiWeb to obtain a server certificate from Let’s encrypt and how to use them in the server policy.

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