Changing the default SSH port from the default 22 is one of the things you should do to secure your server.
The main benefit of changing the default port is to avoid being scanned by casual port scans.
Changing the default port to a random number get rid of some dangerous brute-force attacks.
First you need to log in to your VPS via SSH. If the default port is 22 then you will not need to specify the port.
yum update -y
apt-get update $$ apt-get upgrade
Once the packages are updated, open the SSH configuration file with your favourite editor and find the line that specifies the SSH port
Uncomment the line by removing the # sign and change the default port 22 to one that you want to use.
Save changes and exit
Before changing the port, you should make sure that the new port is free and not used by any other service on your VPS.
You should also check that the port is not closed by your server’s firewall
For the changes to take effect, the service needs to be restarted
service sshd restart
Once restarted, SSH will listen on port 9845 .
This can be checked by running the following command
netstat -tunlp |grep ssh
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