(Not sure if `ListenStream=` is still needed.)
Then reload the conf and restart the service.
```
sudo systemctl daemon-reload
sudo systemctl restart ssh.socket
```
To check it's now listening on ipv4:
```
sudo ss -ltnp | grep :[YOUR CUSTOM PORT NUMBER]
```
Thanks a lot https://askubuntu.com/a/1532434 for the answer 🙏🙏🙏
2/2
#linux #mint #sshd #CustomPort #IPv6 #IPv4 #ConnectionRefused #systemctl #ssh #BindIPv6Only