Bug#978955: last update disables socket activation

On Fri, Jan 01, 2021 at 06:59:42AM +0100, Marc Haber wrote:
> with this last update of the Debian package,
> unstable systems that are using socket activated
> ssh lose ssh access (connection refused).
> 
> It ie nscessary to do systemctl stop ssh.service,
> systemctl start ssh.socket to be able to log in again.

What exactly was the previous version that worked?  1:8.4p1-3 didn't go
anywhere near any of the machinery for socket activation (it only
involved a small fix to the ssh-copy-id shell script), so it's hard to
see what could possibly have gone wrong there.

Is it possible you upgraded some other piece of systemd-related
machinery at around the same time?