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SSL Certificates have become a modern necessity. Organizations operating online need to add them to their website for secure transactions and user information. They are also good at keeping cyberattacks at bay.

OpenVPN is an open-source protocol that creates a secure tunnel between your device and the VPN server. OpenVPN sends encrypted data over the internet. It is one of the most reliable and widely used protocols for VPN connection.

Linux commands can come in handy to system administrators or power users, and lsof is one of them. It stands for ‘List of Open Files.’ This guide will provide you with a basic understanding of lsof command with practical examples.

Many Linux users have used the ifconfig command as a primary tool for obtaining network information. However, this command is obsolete, and we now have the IP command in its place. The IP command has many features compared to the old ifconfig command. Today, you will learn how to use it by practical examples.

Cloud solutions do not require traditional IT costs, hardware, and software. The cloud model outsources all non-core business tasks, saving capital investment and support. Public cloud users can get the IT resources they need, and even the entire virtual data center, at a small price and pay only for what they use.

Our team has compiled a list of some of the most popular cloud providers currently available to help you make the right decision. Check this detailed analysis of all the pros and cons and choose the best mobility source for you and your business.

A firewall is a tool that builds the network security of the server. It plays a significant role in monitoring the in-out flowing traffic. Thus, it becomes an important element for anyone who uses the internet.

Iptables is one of the oldest and most preferred tools used by many Linux users and system administrators.

In this tutorial, you will learn how to protect servers using iptables, basic iptables commands, and the application of the same on the Rocky Linux 8/CentOS 8.

In the previous article, you learned how to connect your server using ssh with the PEM key. In this article, we will show you how you can use the same SSH key, PEM file to securely transfer files using SFTP.

The previous article about iptables demonstrated how it can be used to secure your system. Recently, a new firewall called FirewallD was introduced by Red Hat Enterprise Linux 7.0 (RHEL). FirewallD is the default firewall for Red Hat/CentOS/Rocky Linux and the SUSE family.

This tutorial will provide you with a basic understanding of FirewallD and the ways to secure your system using the firewall-cmd command.

No application can be considered completely secure. The majority of them have flaws and weak areas, leaving doors open for security threats. You can opt for various solutions to secure your data. One of the most well-known ways is by using Fail2Ban.

What is Fail2Ban?

The obvious definition of this application includes monitoring the logs of common services and looking for malicious signs. It scans the log files and automatically bans the IPs with suspicious activity (e.g. a large number of failed login attempts) . These might include exploitations, password failures, etc.

Another Fail2Ban feature is to update the firewall rules. It comes with various filters, including apache, ssh, courier, etc. Each of them serves a different purpose and can be configured.

How to Use Fail2Ban to secure your server?

Now that you know what Fail2Ban is, let’s see how to use Fail2Ban to secure your server. Check this comprehensive Fail2Ban configuration guide:

How to check open ports on a Linux server?

We often have to check open ports on our Linux server to troubleshoot server problems, configure a firewall, and improve our server’s security. There are many third-party tools for this available in the market. In this article we will show you how to use nmap, netstat, ss, and lsof commands to check the open ports and find out the applications associated with those ports.

1. nmap

Nmap or Network Mapper is an open-source tool available in Linux OS for checking open ports, scanning for security vulnerabilities, network auditing, etc. Nmap can also discover system information like operating system's version, MAC address, software version, etc.

If nmap is not installed on your Linux system, then you can install it by executing the following commands in the terminal:

Many Linux users have used the ifconfig command as a primary tool for obtaining network information. However, this command is obsolete, and we now have the IP command in its place. The IP command has many features compared to the old ifconfig command. Today, you will learn how to use it by practical examples.