What is SSH?

Secure Shell (SSH) is a cryptographic network protocol used for a secure connection between a client and a server.

• A Client connects securely to a Server using SSH.
• By default, SSH is not enabled on both Server and Desktop.

Install and Enable SSH Server

Install OpenSSH Server on Ubuntu

Step A: Update Package List

$ sudo apt-get update

(Updates the available package lists)

Step B: Install OpenSSH Server

$ sudo apt-get install openssh-server

(To install OpenSSH server)

Step C: Verify Installation

To check whether OpenSSH is installed:

$ sudo apt list --installed | grep openssh

(This shows installed packages related to OpenSSH.)

Install OpenSSH Client on Ubuntu (If needed)

If you also want to install the SSH client:

$ sudo apt-get install openssh-client

SSH Service Management

After SSH Installation on Ubuntu

Once SSH is installed on Ubuntu, the SSH service will start automatically.

To verify SSH installation & service:

Run:

$ sudo systemctl status ssh

→ After checking, press q to exit.

If SSH Service is NOT started

Run the following commands:

To Start SSH service

$ sudo systemctl start ssh.service

To restart SSH service

$ sudo systemctl restart ssh

To enable SSH service on boot

$ sudo systemctl enable ssh.service

To disable SSH service on boot

$ sudo systemctl disable ssh

To stop SSH service

$ sudo systemctl stop ssh

Connect to Server via SSH

Through PuTTY on Windows Client

Now you can connect through PuTTY by using Windows 10:

Steps in PuTTY:

1. Open PuTTY
2. Select Session Tab on left side column
3. Configure:
   • On Hostname / IP Field: Enter ubuntu server IP
   • On Port Field Port 22 (default SSH port — change if you use a different one)

Then click Open to establish the SSH connection.

Through CMD on Windows Client

Steps in CMD:

1. Open Command Prompt (CMD) in Windows and run:

C:\> ssh username@192.168.1.11

• You will be asked for the password of the username on the server.
• By default, SSH uses Port 22.

Alternative format:

C:\> ssh -p 22 username@192.168.1.11

(Use this if the port is specified explicitly.)

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