Michael P. Soulier via linux wrote on 2025-03-06 03:31:
2025-03-02T00:33:47.783614+00:00 nicodemus dovecot: imap-login: Disconnected: Connection closed: SSL_accept() failed:error:0A000102:SSL routines::unsupported protocol (no auth attempts in 0 secs): user=<>, rip=198.235.24.247, lip=104.236.37.12, TLS handshaking: SSL_accept() failed:error:0A000102:SSL routines::unsupported protocol, session=</2NkMVEv+MvG6xj3>
It looks (at a glance) like the best place to investigate might start with TLS on postfix.
Certs valid and in correct location, for example? Correct ciphers / protocols used?
Perhaps review settings like these, from main.cf: smtpd_tls_protocols = !SSLv2, !SSLv3 smtp_tls_protocols = >=TLSv1 To unsubscribe send a blank message to [email protected] To get help send a blank message to [email protected] To visit the archives: https://lists.linux-ottawa.org
