Hi
Exactly as you're saying - problem solved - CA cant load via aplications.

W dniu 8.05.2023 o 15:31, Viktor Dukhovni via Postfix-users pisze:
On Mon, May 08, 2023 at 01:29:55PM +0200, natan via Postfix-users wrote:

I have some problem with cert - user who connect via 465

postfix/smtps/smtpd[6901]: warning: TLS library problem:
  error:14094418:SSL routines:ssl3_read_bytes:tlsv1 alert unknown ca:
  ../ssl/record/rec_layer_s3.c:1544:SSL alert number 48:

Cert is new (renew) and  openssl x509 -in ... and key is ok
server and client not connect via ssl3
The client cannot validate your server's certificate chain.
Perhaps you've deployed just the leaf certificate, rather
than a "chain" with the leaf certificate plus intermediate
issuing CA?

     https://datatracker.ietf.org/doc/html/rfc8446#page-89

        unknown_ca:  A valid certificate chain or partial chain was received,
           but the certificate was not accepted because the CA certificate
           could not be located or could not be matched with a known trust
           anchor.


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