Linux 6 steps to change the default remote port number of ssh

The default ssh remote port in Linux is 22. Sometimes the default port will be scanned or attacked by people with ulterior motives. In order to make our system more secure, we need to change the remote port number.

Steps:

1. Modify the ssh_config configuration file

vim /etc/ssh/sshd_config

2. Find the line #Port 22 in the configuration file (the default port is 22)

3. Modify this line to the port number you want

Port 222 (Note: remove the leading # sign)

4. [Optional] If you want to add a port number (port 22 and port 222 are effective at the same time)

Port 22 (Note: no # sign in front)
Port 222 (Note: no # sign in front)

5. After exiting, restart the sshd service

/etc/init.d/sshd restart

If you have a firewall set up, you need to add new port rules

6. Edit iptables file

vim /etc/sysconfig/iptables

7. Add port 222 rules

-A INPUT -m state –state NEW -m tcp -p tcp –dport 222 -j ACCEPT

8. Save and exit and restart the iptables service

service iptables restart

9. Test the connection and call it a day.

Summarize

The above is the steps for changing the default remote port number of ssh in Linux 6. I hope it will be helpful to you. If you have any questions, please leave me a message and I will reply to you in time. I would also like to thank everyone for their support of the 123WORDPRESS.COM website!
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