OpenSSH server doesn't log client disconnect without SSH_MSG_DISCONNECT

[Opty]

On Wed, May 22, 2024 at 6:29 AM Damien Miller <djm at mindrot.org> wrote:
> OpenSSH logs the disconnection regardless of whether the client sends
> SSH_MSG_DISCONNECT or just drops the connection.
>
> A little more information may be logged from the disconnect packet
> if it was sent, but there should always be a "Connection closed by ..."
> message regardless.

I should have shown examples from the system log.

SSH-2.0-OpenSSH_9.3:

2024-05-19T15:48:06.591206+02:00 qeporkak sshd 15053 - - Accepted
keyboard-interactive/pam for opty from 127.0.0.1 port 41006 ssh2
2024-05-19T15:48:06.601660+02:00 qeporkak elogind-daemon 1111 - - New
session 2 of user opty.
2024-05-19T15:48:07.797821+02:00 qeporkak sshd 15058 - - Received
disconnect from 127.0.0.1 port 41006:11: disconnected by user
2024-05-19T15:48:07.797967+02:00 qeporkak sshd 15058 - - Disconnected
from user opty 127.0.0.1 port 41006
2024-05-19T15:48:07.802031+02:00 qeporkak elogind-daemon 1111 - -
Removed session 2.

SSH-2.0-PuTTY_Release_0.81:

2024-05-19T15:58:43.680548+02:00 qeporkak sshd 15171 - - Accepted
keyboard-interactive/pam for opty from 127.0.0.1 port 39223 ssh2
2024-05-19T15:58:43.688472+02:00 qeporkak elogind-daemon 1111 - - New
session 3 of user opty.
2024-05-19T15:58:45.000831+02:00 qeporkak elogind-daemon 1111 - -
Removed session 3.

Neither 'Received disconnect' nor 'Disconnected' with PuTTY.

Regards,
Opty