> 2) OpenSSH server was installed as systemd socket activated and so ignored /etc/ssh/sshd_config. sshd still reads /etc/ssh/sshd_config at startup. As far as

> 2) OpenSSH server was installed as systemd socket activated and so ignored /etc/ssh/sshd_config. sshd still reads /etc/ssh/sshd_config at startup. As far as I know, this is hard-coded in the executable. What Debian has changed happens before the daemon is launched: the service is socket activated. So, _if you change the default port of sshd_ in its config, then you have to change the activation: - either enable the sshd@service without socket activation, - or modify the sshd.socket file (`systemctl edit sshd.socket`) which has the port 22 by default. Since Debian already have a environment file (/etc/default/ssh), which is loaded by this service, the port could be set in a variable there and loaded by the socket activation. But then it would conflict with OpenSSH's own files. This is why I've always disliked /etc/default/ as a second level of configuration in Debian.