Security

How to Enable/Disable UFW Firewall on Ubuntu 18.04 & 20.04

August 18, 2019

Ubuntu comes pre-installed with a firewall configuration tool, UFW (Uncomplicated Firewall). This tutorial shows you how to disable and enable an Ubuntu UFW firewall using the command line.

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How to Disable or Turn Off Firewalld on CentOS 7

August 15, 2019

Firewalld is a dynamically managed firewall solution that supports network zoning. As of CentOS 7, firewalld (Dynamic Firewall Manager) is the default firewall tool on CentOS servers. Admins might need to disable firewalld for testing or switching to another firewall tool. This tutorial shows you how to disable and stop the firewall on CentOS 7

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How to Install Sophos Intercept X Advanced for Server

August 5, 2019

If you are using the Sophos Central Admin platform to manage and secure your devices, you will want to activate Server Protection. Deploy Sophos agents on Linux and Windows servers quickly and easily, with the step-by-step help of this installation guide.

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How to Enable SSH on Debian 9 or 10

July 30, 2019

If you are using Debian 9 or Debian 10 to manage servers, you must ensure that the transfer of data is as safe as possible. This tutorial covers the necessary steps you need to take to establish a secure connection with a remote machine by using SSH.

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How to Generate SSH Keys on Ubuntu

July 29, 2019

Establishing a connection with a remote server without taking the proper security measures can lead to severe consequences. This article is meant to help system administrators configure SSH Keys on Ubuntu. The instructions allow you to set up encrypted credentials quickly.

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How to Install Kali Linux on VirtualBox

July 14, 2019

Kali Linux is a Debian-derived Linux distribution designed for penetration testing. With over 600 preinstalled penetration-testing programs, it earned a reputation as one of the best-operating systems used for security testing. As a security-testing platform, it is best to install Kali as a VM on VirtualBox. This article shows you how to install Kali Linux on Virtual Box.

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How to Install RPM Packages on Ubuntu

July 9, 2019

RPM is a package format used by Red Hat based derivatives like CentOS, RHEL or Fedora. It gets its name from the RPM Package Manager (RPM), a free and open-source package management system for installing, uninstalling, and managing software packages in Linux. In this tutorial, learn how to install .rpm packages on Ubuntu.

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How to Change or Reset Administrator Password on Windows Server

July 7, 2019

There may come a time when you need to change the admin password on your Windows Server. How to change your administrator password largely depends on whether you remember the old password or not. If you are routinely changing a known administrator password, you can use the user interface. However, if you're changing an unknown administrator password, you may need to use the command line interface.

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How to Check Kernel Version in Linux in Command Line

June 25, 2019

The Linux kernel is much like the central brain of the operating system. Although it is open-source – meaning anyone can view and modify the code – the Linux kernel is built with multiple protocols to ensure stability and security. This guide will walk you through how to check the Linux kernel version of your operating system.

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How to Check the OpenSSL Version Number

June 13, 2019

OpenSSL is an open-source cryptographic library and SSL toolkit. The applications contained in the library help create a secure communication environment for computer networks. This article explains how to determine the OpenSSL version by entering a single command.

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