tls_early_post_process_client_hello:unsupported protocol

[Elise]

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=</w+MZ7jKvLhomDQf>

Is this a TLS 1.3 related issue?

/elise
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