[Bug 285363] Fssh_kex_protocol_error

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 13 Mar 2025 21:04:51 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285363

Jose Luis Duran <jlduran@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jlduran@FreeBSD.org

--- Comment #3 from Jose Luis Duran <jlduran@FreeBSD.org> ---
All errors seem to be originated by port-knocking bots, for example:

    % echo "SSH-1.5-TEST" | nc <ssh-server> 22
    sshd-session[xxxx]: error: Protocol major versions differ: 2 vs. 1

I fail to see where the bug is. Perhaps, in /etc/syslog.conf comment the line:

    *.err;auth.notice;authpriv.none;kern.debug;mail.crit        /dev/console

And restart the service.

For a longer explanation, see bug #264600.

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