Ubuntu SSH Server Setup: Step-by-Step Guide

Setting up an SSH server requires the following steps:

1. To install SSH server software:
   On Ubuntu systems, OpenSSH is commonly used as the SSH server software. You can install the OpenSSH server using the following command:

sudo apt-get update
sudo apt-get install openssh-server

1. Setting up SSH server:
   By default, the OpenSSH server is already installed and running. However, you can configure it according to your needs. The configuration file for the SSH server is located at /etc/ssh/sshd_config. You can edit this file to change the configuration of the SSH server, such as changing the SSH port number, disabling root login, and more.
2. To restart the SSH server:
   After making changes to the SSH server’s configuration files, it is necessary to restart the SSH server for the changes to take effect. This can be done by using the following command to restart the OpenSSH server:

sudo systemctl restart ssh

1. Set up the firewall:
   If the firewall is enabled on the system, make sure that the SSH server port is open. By default, the SSH server uses port 22. You can use the following command to open the SSH server port:

sudo ufw allow ssh

1. Test SSH Connection:
   Finally, you can test to see if connecting to the SSH server is successful using an SSH client. Use the following command to connect to the SSH server:

ssh username@server_ip

Your username is your username, and server_ip is the IP address of the SSH server. Once connected successfully, you will be prompted to enter a password for authentication. If everything goes well, you will be successfully connected to the SSH server.