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Asked: 2010-03-30 02:13:14 +0800 CST

How do I change the ssh port to something other than 22?

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How do I change the ssh port to something other than 22 on Ubuntu Hardy?

ubuntu ssh

2 Answers

  1. Edit the port line in /etc/ssh/sshd_config and restart the ssh server (/etc/init.d/ssh restart)

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  2. Best Answer

    Edit /etc/ssh/sshd_config and specify the port as Port 2222 (for example). Then restart the ssh daemon by running /etc/init.d/ssh restart.

    Please note that this change will not improve your security! It is easy to check services mapped to ports. For example, if you change SSH port to 2222, and then run a port scan from another computer:

    nmap -A testserver

    you will get something like:

    2222/tcp open  ssh      OpenSSH 5.1p1 Debian 6ubuntu2 (protocol 2.0)
|  ssh-hostkey: 1024 ba:e5:c3:42:f0:7d:9a:c5:f4:32:71:af:a5:f9:9c:b7 (DSA)
|_ 2048 bc:cf:68:f9:6f:8a:88:8f:7b:7a:b1:fa:5a:29:24:47 (RSA)

    Edit: you may find useful the following article on SSH security practices: http://www.cyberciti.biz/tips/linux-unix-bsd-openssh-server-best-practices.html (#16, in particular).

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