Ubuntu Linux OpenSSH Server installation and configuration

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OpenSSH is a FREE version of the SSH connectivity tools that technical users of the Internet rely on. Users of telnet, rlogin, and ftp may not realize that their password is transmitted across the Internet unencrypted, but it is. OpenSSH encrypts all traffic (including passwords) to effectively eliminate eavesdropping, connection hijacking, and other attacks. Additionally, OpenSSH provides secure tunneling capabilities and several authentication methods, and supports all SSH protocol versions.

Ubuntu SSHD Installation
Type the following two command to install both ssh client and server:
# sudo apt-get install openssh-server openssh-client

SSHD Configuration
To be frank your server is ready by default. Just test it from your home computer or from same system with the command:
# ssh localhost

OR
# ssh user@your-server-ip-address

How do I use ssh client?
Assuming that your server hostname is userver.mydomain.com and username is vivek, you need to type the following command:
# ssh vivek@userver.mydomain.com

To stop ssh server, enter:
# sudo /etc/init.d/ssh stop

To start sshs server, enter:
# sudo /etc/init.d/ssh start

To restart ssh server, enter:
# sudo /etc/init.d/ssh restart

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