We’re one more time talking about security, this time it will about how to secure
sshd a little bit more, and we will do it by changing the default port where sshd listens.
This way the attacker needs to guess your user (I’m sure you have disabled root access right?), your password, and now … yes, the port number where ssh daemon is listening.
Change the default ssh port
Edit the file
/etc/ssh/sshd_config and search for the world Port it will say 22, change it to something like 4000 or better, 3756 :).
Then save the file, and restart the ssh service.
And now you have a more secured server, another option you have is to have your server login only thru ssh public key