Enable SSH access through more than one port

I explained some time ago how to configure the SSH service to work on a different port than 22, which is the default port. The objective of this was that all bots, cracking attacks to SSH are by default to port 22 (which I repeat, is the default), so by changing the port we will obtain more security.

But what to do if I want to configure SSH through another port BUT keeping SSH also on port 22? That is, having the need for the server to have SSH on more than one port, say for example on 22 and also on 9122

For this we modify the configuration file of the SSH daemon:

nano /etc/ssh/sshd_config

There we will see something like this:

You will see that on line 5 there is something that says: "Port 22", well, we just have to duplicate that line below and change the port number. In other words, for our SSH service to also work for 9122 we must leave it like this:

Then we must restart the service:

service ssh restart

If they use Arch it would be:

systemctl restart sshd

When you want to connect through a port other than 22 remember, you must add -p $ PORT in the connection line, something like this:

ssh usuario@servidor -p 9122

By the way, I recommend you check the sshd_config file from before, there are some very interesting options 😉

regards