Comment # 2 on bug 1226268 from Antonio Larrosa

That's interesting. The default value when PrintMotd doesn't appear in
/etc/ssh/sshd_config is "yes". In 15.6, the motd is now printed by pam_motd, so
we changed the sshd_config file installed by the openssh-server package to have
"PrintMotd no" but if the /etc/ssh/sshd_config file was modified in some way
then rpm will not replace it during the system upgrade and will leave the old
configuration file that doesn't set PrintMotd.

In fact, I tested installing a 15.5 vm and then upgrading it to 15.6 and I
couldn't reproduce the issue, but then, I didn't modify the sshd_config file,
so it could be replaced with the new version during the upgrade.

Can you please check if you have a sshd_config.rpmnew file under
/etc/ssh/sshd_config? The best would be to merge the new changes from that file
but in any case, you can also try just adding a line with "PrintMotd no" into
sshd_config. That should leave just one motd.

Also, if you want to remove the motd so it's not shown at all, in 15.6 the way
to do it is to remove the contents of /etc/motd and leave it empty. Just for
the record, in TW this is now done by creating a symlink like this: "ln -s
/dev/null /etc/motd.d/welcome" which silences /usr/lib/motd.d/welcome (which is
where the motd is set now)