Elise dovecot_ML@cloudzeeland.nl wrote:

I just read a line in my logfile that I haven't noticed before:

Aug 29 22:17:23 <myserver> dovecot[50098]: imap-login: Disconnected: Connection closed: SSL_accept() failed: error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol (no auth attempts in 2 secs): user=<>, rip=104.152.52.31, lip=10.10.10.37, TLS handshaking: SSL_accept() failed: error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol, session=

Is this a TLS 1.3 related issue?

Yes, but: The IP resolves to internettl.org which has the following blurp on its website: "The InterneTTL is a research project that identifies servers on the Internet. InterneTTL continuously scans every host on the Internet providing IT and security teams with realtime visibility into active servers."

Make from that, what you want.

Grüße, Sven.

-- Sigmentation fault. Core dumped.