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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:
     
    [email protected] [~]# cd /etc/ssh/
    [email protected] [/etc/ssh]# cp sshd_config sshd_config.save
    [email protected] [/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

    [email protected] [/etc/ssh]# diff sshd_config sshd_config.save
    13c13
    < Port 4000

    > #Port 22
    [email protected] [/etc/ssh]#
     

  4. Lastly, restart sshd and verify that it is now listening on the new port.
     
    [email protected] [/etc/ssh]# /etc/init.d/sshd restart
    Stopping sshd:                                             [  OK  ]
    Starting sshd:                                             [  OK  ]
    [email protected] [/etc/ssh]# netstat -anp | grep sshd
    tcp        0      0 0.0.0.0:4000           0.0.0.0:*           
    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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