either do
openssl s_client -connect host:993
or
openssl s_client -connect host:143 -starttls imap
Aki
On 20/11/2025 17:49 EET Marek Gresko via dovecot
<[1][email protected]> wrote:
When trying openssl s_client to port 143, I get:
no peer certificate available
--
No client certificate CA names sent
Negotiated TLS1.3 group: <NULL>
---
SSL handshake has read 5 bytes and written 1556 bytes
Verification: OK
---
New, (NONE), Cipher is (NONE)
Protocol: TLSv1.3
This TLS version forbids renegotiation.
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
Why there is no certificate present? Because dovecot refuse to present
it since it thinks it is weak?
Marek
Odoslane pomocou bezpecneho emailu Proton Mail.
stvrtok 20. novembra 2025, 16:45, Marek Gresko
<[2][email protected]> napisal/a:
Hello,
I added ca_file to the server section. I do not want clients to
present certificates, so I did not create the ssl client section you
proposed.
Any other suggestion?
I still cannot imagine what could be the cause.
Thanks
Marek
Odoslane pomocou bezpecneho emailu Proton Mail.
stvrtok 20. novembra 2025, 16:13, pgnd [3][email protected] napisal/a:
after upgrading from Fedora 42 to Fedora 43 the dovecot got
upgraded to version 2.4.
imo, a sloppy choice on their part, forcing the need to
significantly change imap config at the same time as an OS upgrade,
and 'breaking imap' for lots of folks.
Should the authority certificate be configured somewhere in
dovecot?
start with a thorough read of
[4]https://doc.dovecot.org/2.4.2/core/config/ssl.html
if using self-signed certs, you'll end up with something similar to
ssl = required
...
ssl_server {
ca_file = /path/to/your_CA.crt.pem
cert_file = /path/to/your_domain.server.ec.crt.pem
key_file = /path/to/your_domain.server.ec.key.pem
...
}
ssl_client {
ca_file = /path/to/your_CA.crt.pem
cert_file = /path/to/your_domain.client.ec.crt.pem
key_file = /path/to/your_domain.client.ec.key.pem
...
}
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