SSH Fails After Changing Port and Reboot Server

Bardulf

Hi,
I changed ssh port, I work well before after I reboot my server, after that I lost access to ssh and can't login to server, I don't change root access in sshd_config, just change port to 22000, anyone know what I done wrong?

donli

Hard to say what exactly you did wrong just that you did. A common error these days when you change the sshd port is you are running a firewall and failed to put a rule in to allow access to the new port.

Whenever you change sshd_config (1) Make a backup copy first. (2) test your new config
before logging out of the session on the original port (you can even try sshd with a new test config file with a command like: /usr/sbin/sshd -f /etc/ssh/sshd-config.test ).

You can fix what you did if your VPS/server control panel supports console access - does it?

cybertech

vnc in and check firewall maybe

Bardulf

donli said: When ever you change sshd_config (1) Make a backup copy first. (2) test your new config before logging out of the session on the original port.

I test new port and it works well

donli said: You can fix what you did if your control panel supports console access - does it?

unfortunately it doesn't have console, I must reinstall server.

Bardulf

@cybertech said:
vnc in and check firewall maybe

That was my bad I changed iptable roles and it works well

cybertech

No worries mate I make that mistake all the time too

Woes of the amateur

NanoG6

If not firewall, then it must be selinux