On 2024-03-12, steffan--- via dovecot <dovecot@dovecot.org> wrote:
> I have an old CentOS 7 server using dovecot 2.2.36  and OpenSSL 1.0.2k-fips=
>  that=92s been fine for quite some time. Recently I started getting complai=
> nts related to SNI.
>
> I test with this: openssl s_client -connect mail.domain.com:993 -crlf -quie=
> t
>
> On macOS using OpenSSL LibreSSL 3.3.6 I test and get the default dovecot do=
> main =93SomeWrongDomain.com=94 which causes issues.
>
> On Oracle Linux 9 using OpenSSL 3.0.7 I get the correct response for the do=
> main =93mail.domain.com=94

That's not a valid test. openssl >=1.1.1 s_client uses SNI by default,
with libressl or older openssl you need to use -servername.


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