Debian Install OpenSSH Server :

Hello there, welcome to our comprehensive guide on how to install OpenSSH server on a debian OS. We understand that setting up a secure connection between two systems is an essential process that you may need to undertake. It is for this reason that we have created this step-by-step guide to help you install OpenSSH server on your debian-driven device. In this article, you will learn how to install and configure your OpenSSH server, enable key authentication, troubleshoot problems, and more.

Install OpenSSH Server on Debian

In this section, we will focus on how to install OpenSSH server on your Debian system. But first, let us give you a brief overview of what OpenSSH server is and why it is essential.

What is OpenSSH Server?

OpenSSH stands for Open Secure Shell. It is a free and open-source software that provides secure communication between devices. OpenSSH server is one of the most popular SSH implementations that allows remote login, file transfer, and tunneling.

Now, let us get down to business and look at how to install OpenSSH server on a debian OS.


Before proceeding with the installation, ensure that you have the following:

Item Description
Debian device The device on which OpenSSH server will be installed
Administrator privileges You must have root or sudo access to the debian device
Internet connection A stable internet connection to download and install OpenSSH server packages

Installation Steps

Follow the steps below to install OpenSSH server on debian:

1. Update system repositories

Run the following commands to update your system repositories:

sudo apt-get update

2. Install OpenSSH Server

Once your system repositories are updated, run the following command to install OpenSSH server:

sudo apt-get install openssh-server

During the installation process, you will be prompted to enter Y to confirm the installation.

3. Verify Installation

After the installation process is complete, verify that OpenSSH server is installed by running the following command:

systemctl status ssh

If OpenSSH server is running, you should see an output similar to the one below:

ssh.service - OpenBSD Secure Shell server

4. Configure OpenSSH Server

By default, OpenSSH server is installed with default settings that may not be suitable for your needs. In this section, we will guide you through the process of configuring OpenSSH server to fit your requirements.

How do I enable key authentication on OpenSSH server?

To enable key authentication, follow the steps below:

Step 1: Create SSH key pair

Run the following command to create a key pair:

ssh-keygen -t rsa

The above command will create two files, id_rsa (private key) and (public key).

Step 2: Copy public key to the server

Run the following command to copy your public key to the server:

ssh-copy-id user@server-ip

Replace ‘user’ with your username and ‘server-ip’ with your server’s IP address.

Step 3: Disable password authentication

To disable password authentication, open the sshd_config file using the command below:

sudo nano /etc/ssh/sshd_config

Locate the line that reads “#PasswordAuthentication yes” and replace it with “PasswordAuthentication no”. Save the changes and exit the file.

Step 4: Restart OpenSSH server

Run the following command to restart OpenSSH server:

sudo systemctl restart ssh

How do I troubleshoot OpenSSH server problems?

If you experience problems with OpenSSH server, try the following solutions:

Solution 1: Check OpenSSH server logs

To check OpenSSH server logs, run the following command:

sudo tail -f /var/log/auth.log

This command will display the logs in real-time.

Solution 2: Check firewall settings

Ensure that the port used by OpenSSH server is open in your firewall settings. By default, OpenSSH server uses port 22.

Solution 3: Check network settings

Ensure that your device is connected to the network and that the network settings are correct.

Solution 4: Restart OpenSSH server

Sometimes, restarting OpenSSH server can solve problems. To restart OpenSSH server, run the following command:

sudo systemctl restart ssh

With the above solutions, you should be able to troubleshoot most OpenSSH server problems.


There you have it, a comprehensive guide on how to install OpenSSH server on debian. We hope that you found this article helpful and that you were able to set up a secure connection between your devices. Remember to configure your OpenSSH server to fit your requirements and troubleshoot any problems that may arise. Happy SSHing!

Source :