To change which port ssh listens on, you just need to edit the sshd_config file. The default directory for ssh configuration is /etc/ssh.
- First, backup the current configuration and use your favorite editor to change the Port line:
root@root [~]# cd /etc/ssh/
root@root [/etc/ssh]# cp sshd_config sshd_config.save
root@root [/etc/ssh]# vi sshd_config
- Now, locate the following line:
- For this example, we’ll set it to port 4000, by replacing “Port 22” with “Port 4000“. *Note: Do not forget to remove the comment (#).
root@root [/etc/ssh]# diff sshd_config sshd_config.save
< Port 4000
> #Port 22
- Lastly, restart sshd and verify that it is now listening on the new port.
root@root [/etc/ssh]# /etc/init.d/sshd restart
Stopping sshd: [ OK ]
Starting sshd: [ OK ]
root@root [/etc/ssh]# netstat -anp | grep sshd
tcp 0 0 0.0.0.0:4000 0.0.0.0:*
And there you have it! You can set the port number to whichever port you prefer, but keep in ming that port numbers between 0 and 1,023 are reserved for existing system services. For this reason, you’re typically better off choosing a number above Port 1023.
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