ssh warning

This is not a big thing, but sometime this small things matter a lot.

You can put a message on remote ssh login for user or it will just act as a warning for a defaulters.

Steps:
1. Open a file using : emacs /etc/motd and write a messge you want
e.g.
********************************************************************
* *
* This system is for the use of authorized users only. Usage of *
* this system may be monitored and recorded by system personnel. *
* *
* Anyone using this system expressly consents to such monitoring *
* and is advised that if such monitoring reveals possible *
* evidence of criminal activity, system personnel may provide the *
* evidence from such monitoring to law enforcement officials. *
* *
********************************************************************
==========================================================
Unauthorized access to this machine is prohibited
Press if you are not an authorized user

2. Save the file and exist.
3. Restart the ssh service using. #service sshd restart

Change the default port for SSh user

Default port for SSH user is 22. But we can change the default port to some another port.
eg. I want to run ssh service on port 99 instead of 22.

Make the following change.

open files
#emacs /etc/ssh/ssh_config
#emacs /etc/ssh/sshd_config

search for port ie is default port = 22

make port = 99

or

You can run on any port, But make sure other service not running on that port.