Security

sudo stands for SuperUser DO, and it’s used to temporarily elevate privileges in Linux. This guide will show you several ways that sudo command can be used.

Learn how to use iptables commands and see how iptables works. By following the instructions listed in this article, you'll get a better understanding of network packets, and can configure basic rules for your system and set up ports on the firewall to meet your security needs.

This article explains why ERR_SSL_VERSION_OR_CIPHER_MISMATCH occurs and the best approach for resolving this SSL error.

Squid is a Linux-based proxy application that can be used for filtering traffic, security, DNS lookups, and speeding up a web server by caching resources. This guide will walk you through setting up and installing Squid Proxy on Ubuntu.

This guide outlines 22 essential practices for securing a server and includes a convenient checklist for easy reference.

This article explains three methods of generating SSH keys on a Windows system. Create SSH keys using the PuTTY tool, OpenSSH client utility, or via WSL.

The file permission feature specifies how much power each user has over a given file or directory. This tutorial explains how to read and change Linux file or directory permissions.

This article explains how to change a user password in Linux and how to force other users to change their passwords on login.

Sudo stands for superuser do. Sudo is a command used in Unix-like systems to allow a regular user to execute a program as another user. In most cases, it is the root user. Sudo gives you administrator-level permissions to run programs on your machine. This guide will show you how to create a user with sudo privileges on Debian and test the sudo access.

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.