kazulog@sv1:~$ sshd -V
OpenSSH_10.2p1 Ubuntu-2ubuntu3.6, OpenSSL 3.5.5 27 Jan 2026
kazulog@sv1:~$ grep -n 'Include' /etc/ssh/sshd_config
24:Include /etc/ssh/sshd_config.d/*.conf
kazulog@sv1:~$ ls -l /etc/ssh/sshd_config.d/
total 8
-rw------- 1 root root 27 Sep 10 13:30 50-cloud-init.conf
-rw-r--r-- 1 root root 26 Aug 24 01:26 60-cloudimg-settings.conf
kazulog@sv1:~$ sudo sshd -T | grep -iE '^(port|passwordauthentication|permitrootlogin|pubkeyauthentication)'
port 22
permitrootlogin prohibit-password
pubkeyauthentication yes
passwordauthentication yes
kazulog@sv1:~$ systemctl is-enabled ssh ssh.socket
disabled
enabled
kazulog@sv1:~$ systemctl cat ssh.socket | head -20
# /usr/lib/systemd/system/ssh.socket
[Unit]
Description=OpenBSD Secure Shell server socket
Before=sockets.target ssh.service
ConditionPathExists=!/etc/ssh/sshd_not_to_be_run

[Socket]
ListenStream=0.0.0.0:22
ListenStream=[::]:22
BindIPv6Only=ipv6-only
Accept=no
FreeBind=yes

[Install]
WantedBy=sockets.target
RequiredBy=ssh.service