SSL23_GET_CLIENT_HELLO:unknown protocol

[Voytek Eymont]

I have a user failing to get mail , using TBird client

is this due to his TBird email client backlevel TLS support ?

I'm trying to find out his TBird version, might be an older TBird

# dovecot --version
2.3.15 (0503334ab1)

# egrep "ssl_protocols|ssl_min_protocol" /etc/dovecot/conf.d/10-ssl.conf

#ssl_min_protocol = TLSv1.2

Jun 29 14:23:27 pop3-login: Info: Disconnected: Connection closed:
SSL_accept() failed: error:140760FC:SSL
routines:SSL23_GET_CLIENT_HELLO:unknown protocol (no auth attempts in 1
secs): user=<>, rip= 111.222.333.555, lip=ser.ver.ip.add, TLS handshaking:
SSL_accept() failed: error:140760FC:SSL
routines:SSL23_GET_CLIENT_HELLO:unknown protocol,
session=<kZ6p99/FW9iTMgHi>


Jun 29 14:23:54 pop3-login: Info: Disconnected: Connection closed:
SSL_accept() failed: error:140760FC:SSL
routines:SSL23_GET_CLIENT_HELLO:unknown protocol (no auth attempts in 1
secs): user=<>, rip= 111.222.333.555, lip=ser.ver.ip.add, TLS handshaking:
SSL_accept() failed: error:140760FC:SSL
routines:SSL23_GET_CLIENT_HELLO:unknown protocol,
session=<Gq5G+d/Fu1STMgHi>