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How Can I Change the Port SSH Listens On?

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.

  1. 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
    root@root [/etc/ssh]# vi sshd_config

  2. Now, locate the following line:

    #Port 22

  3. 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 (#).

    Port 4000

    root@root [/etc/ssh]# diff sshd_config
    < Port 4000

    > #Port 22
    root@root [/etc/ssh]#

  4. 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*
    LISTEN 1605/sshd

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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