systemctl status sshd
sudo systemctl restart ssh
sudo ufw allow ssh
Enable the SSH server to start automatically during the boot.
sudo systemctl enable ssh
Connect from a remote client to your SSH server. First, obtain an IP address of your SSH server.
ip a
If connecting over the internet you need your external IP address:
echo $(wget -qO - https://api.ipify.org)
Check if IP being used to login via SSH is correct. Re-check IP of device being SSH'd into with:
hostname -I
For Dynamic DNS the freedns.afraid.org works fine with ddclient in Linux.
If you don't want to use the default port 22 for SSH, you need to edit the sshd config file in:
/etc/ssh/sshd_config
and change the value of "Port 22" in it for another number. You should run SSH on an unprivileged port number, i.e. from 1024 to 65535. You can check what local ports are in use currently to avoid a conflict with:
netstat -taulpn
and also avoid IANA registered service numbers, check with:
cat /etc/services
Once you have made the appropriate change open a firewall port to correspond with the new SSH port where "xxxx" represent the new number that you chose:
sudo ufw allow xxxx/tcp
Then
sudo systemctl restart ssh
For a SSH connection through a specific port, where "xxxx" is the number chosen, do:
ssh -p xxxx username@{hostname or IP}
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