Linux Change SSH port

The default remote management port for Windows Server is the default port for the 3389,linux server is 22. If you are on the public web, you will often be swept by the tool, which is not safe, for system security, you need to change the default configuration.

The following is an example of the operation process in Centos6.5:

[[email protected] ~]# Cp/etc/ssh/sshd_config/etc/ssh/sshd_config.ori change pre-configuration backup [[email protected] ~]# Vi/etc/ssh/sshd_c Onfig Edit sshd_config### #by zdw#2016-4-11## Add the following: Port 52113PermitRootLogin NOPERMITEMPTYPASSW Ords nousedns nogssapiauthentication no### #by zdw#2016-4-11##

Parameter description:

Parameters	Description
Port	Specifies the port number that the sshd daemon listens on, which defaults to 22. The default is to listen on all network interfaces on this computer, or you can specify only on a specific interface by listenaddress. Port range: 0-65535, cannot conflict with an existing server port.
Permitrootlogin	Whether to allow root login. The available values are: "Yes" (default), "No" means no, "without-password" means no password authentication is allowed; "Forced-commands-only" Indicates that a public key authentication login is allowed only if the command option is specified, while the other authentication methods are all banned, and this value is often used to do things like remote backup
Permitemptypasswords	Whether to allow users with blank passwords to log on remotely. Default to "No"
Usedns	Specifies whether sshd should reverse-parse the remote host name to check if this hostname corresponds to its IP address. The default value is "Yes". Suggest change to "no", otherwise it may cause SSH connection to be slow
Gssapiauthentication No	Solve the problem of slow remote connection between Linux using SSH

When the above modifications are complete, save to exit.

Perform the following command to restart sshd for the configuration to take effect:

[[email protected] ~]# /etc/init.d/sshd reloadreloading sshd:                                               [  ok  ][[email protected] ~]# /etc/init.d/sshd  restartStopping sshd:                                               [  OK   ]Starting sshd:                                      &nbSP;        [  OK  ] 

Note: Reload is a smooth restart and does not affect other users who are SSH connected, so it is better than restart.

At this point, the root user is no longer able to log on, using ZDW users to log on by 52113.

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[Email protected] ~]$ whoamizdw[[email protected] ~]$ su-rootpassword: [[email protected] ~]# Whoamiroot

Reference:

Old boy Linux

http://oldboy.blog.51cto.com/2561410/1300964

This article is from the blog "Write to Yourself", so be sure to keep this source http://zhaodongwei.blog.51cto.com/4233742/1762544

Linux Change SSH port