I get the following error running 'sudo service stunnel4 status'  :

LOG3[0]: SSL_accept: ../ssl/record/ssl3_record.c:331: error:1408F10B:SSL 
routines:ssl3_get_record:wrong version number

is that merely a mismatch between openSSL versions used by client and server?

I have tried changing the config file options, also with no specification since 
the default according to stunnel.org is:

    options = NO_SSLv2
    options = NO_SSLv3

I have tried (service level option):
   sslVersion = TLSv1

Same error.  When running sudo service stunnel4 status after start:

    May 12 08:22:45 user-Linux stunnel[16630]: LOG5[ui]: Threading:PTHREAD 
Sockets:POLL,IPv6,SYSTEMD TLS:ENGINE,FIPS,OCSP,PSK,SNI Auth:LIBWRAP
    May 12 08:22:45 user-Linux stunnel4[16616]: Starting TLS tunnels: 
/etc/stunnel/stunnel.conf: started
    May 12 08:22:45 user-Linux stunnel[16630]: LOG5[ui]: Reading configuration 
from file /etc/stunnel/stunnel.conf
    May 12 08:22:45 user-Linux systemd[1]: Started LSB: Start or stop stunnel 
4.x (TLS tunnel for network daemons).
    May 12 08:22:45 user-Linux stunnel[16630]: LOG5[ui]: UTF-8 byte order mark 
not detected
    May 12 08:22:45 user-Linux stunnel[16630]: LOG5[ui]: FIPS mode disabled
    May 12 08:22:45 user-Linux stunnel[16630]: LOG4[ui]: Insecure file 
permissions on /var/lib/stunnel4/psk.txt
    May 12 08:22:45 user-Linux stunnel[16630]: LOG5[ui]: Configuration 
successful
    May 12 08:22:45 user-Linux stunnel[16630]: LOG5[ui]: Switched to chroot 
directory: /var/lib/stunnel4/
    May 12 08:22:45 user-Linux stunnel[16632]: LOG5[cron]: Updating DH 
parameters

After trying to make a connection via FIX connection:

    May 12 08:28:04 user-Linux stunnel[16798]: LOG7[0]: Service [**redacted**] 
started
    May 12 08:28:04 user-Linux stunnel[16798]: LOG7[0]: Setting local socket 
options (FD=3)
    May 12 08:28:04 user-Linux stunnel[16798]: LOG7[0]: Option TCP_NODELAY set 
on local socket
    May 12 08:28:04 user-Linux stunnel[16798]: LOG5[0]: Service [**redacted**] 
accepted connection from 127.0.0.1:51954
    May 12 08:28:04 user-Linux stunnel[16798]: LOG6[0]: Peer certificate not 
required
    May 12 08:28:04 user-Linux stunnel[16798]: LOG7[0]: TLS state (accept): 
before SSL initialization
    May 12 08:28:04 user-Linux stunnel[16798]: LOG3[0]: SSL_accept: 
../ssl/record/ssl3_record.c:331: error:1408F10B:SSL 
routines:ssl3_get_record:wrong version number
    May 12 08:28:04 user-Linux stunnel[16798]: LOG5[0]: Connection reset: 0 
byte(s) sent to TLS, 0 byte(s) sent to socket
    May 12 08:28:04 user-Linux stunnel[16798]: LOG7[0]: Local descriptor (FD=3) 
closed
    May 12 08:28:04 user-Linux stunnel[16798]: LOG7[0]: Service [**redacted**] 
finished (0 left)
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