Hi,
Let's Encrypt new chain of trust is now the following:
- *ISRG Root X1*: *C = US, O = Internet Security Research Group, CN = ISRG
Root X1*
  (was previsouly also cross signed by *DST Root CA X3*: *O = Digital
Signature Trust Co., CN = DST Root CA X3*)
- *R3*: *C = US, O = Let's Encrypt, CN = R3*
- your server cert

You mention that the cross-signed root certificate was removed with
ipa-cacert-manage, but did you also run ipa-certupdate before trying
ipa-server-certinstall? This step is mandatory in order to update the NSS
databases, as specified in the man page ipa-cacert-manage(1).

HTH,
flo

On Thu, Oct 7, 2021 at 11:44 PM Stefan Fleischmann via FreeIPA-users <
[email protected]> wrote:

> Hi! I've been using FreeIPA (installed without CA --no-pkinit) with
> letsencrypt certificate. Whenever the certificate gets renewed I install it
> with
> ipa-server-certinstall for both the LDAP and web server and that has been
> working just fine. Recently the root certificate (DST Root CA X3)
> expired as mentioned here
> https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/
>
> Now when I try to install the new certificate I get this error:
> ---
> CA certificate CN=DST Root CA X3,O=Digital Signature Trust Co. in
> /etc/letsencrypt/live/XXX/cert.pem, /etc/letsencrypt/live/XXX/privkey.pem
> is not valid: certutil: certificate is invalid: The certificate issuer's
> certificate has expired. Check your system date and time.
>
> The ipa-server-certinstall command failed.
> ---
> I don't understand this error message at all since the `cert.pem` file
> does not contain any reference to the X3 CA, so I suppose it must come from
> somewhere else. Does someone have an idea how to fix this?
>
> I've already removed the root certificate with ipa-cacert-manage and added
> the self-signed X1 root cert, yet the same error message above keeps
> showing up.
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