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Openssh server ubuntu4/12/2023 ![]() You will edit the main OpenSSH configuration file in /etc/ssh/sshd_config to set the majority of the hardening options in this tutorial. However, the configuration you’ll use in this step is a general secure configuration that will suit the majority of servers. The exact hardening configuration that is most suitable for your own server depends heavily on your own threat model and risk threshold. In this first step, you will implement some initial hardening configurations to improve the overall security of your SSH server. Once you have this ready, log in to your server as your non-root user to begin. An Ubuntu 20.04 server set up by following the Initial Server Setup with Ubuntu 20.04, including a sudo non-root user.To complete this tutorial, you will need: In this tutorial, you will harden your OpenSSH server by using different configuration options to ensure that remote access to your server is as secure as possible. Properly securing your OpenSSH server is very important, as it acts as the front door or entry-point into your server. You can learn more about the SSH client-server model in SSH Essentials: Working with SSH Servers, Clients, and Keys. You can connect to an OpenSSH server using the OpenSSH client, specifically by running the ssh command. OpenSSH server is the server side of SSH, also known as SSH daemon or sshd. Linux servers are often administered remotely using SSH by connecting to an OpenSSH server, which is the default SSH server software used within Ubuntu, Debian, CentOS, FreeBSD, and most other Linux/BSD-based systems. A previous version of this tutorial was written by Jamie Scaife.
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