Networking

Error 521: What Causes It and How to Fix It

March 2, 2023

The error message "Error 521: Web server is down" indicates an issue with the server. This guide explains common causes and provides methods to troubleshoot and resolve error 521.

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How to Reduce DNS Lookups


Reducing DNS lookup time improves the performance of your website in a number of important ways, including Faster website and individual component loading, reduced network latency, and better server utilization. This article explains the importance of reducing DNS lookups and provides ten tips to optimize DNS lookups on your website.

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SSH vs. SSL: What Are the Differences?

February 23, 2023

SSH (Secure Shell) and SSL (Secure Sockets Layer) protocols are cryptographic technologies that ensure secure communication over the internet. This guide explains how they work, what makes them different, and which one to use.

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How to Set Up Static IP Address for Raspberry Pi

February 22, 2023

Setting up a static local network IP address on a device ensures that its location on the network persists across reboots. Static IPs are especially useful when accessing devices remotely (e.g., over SSH). This tutorial shows you how to configure a static IP address on Raspberry Pi.

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How to Change the SSH Port?

February 13, 2023

This tutorial shows the steps required for changing the default SSH port into a different one. A different port adds an extra layer of protection to the connection.

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Error 520: What It Means and How to Fix It

February 9, 2023

This guide explains what error 520 means, what causes it, and how to fix it.

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How to Configure Postfix to Use External SMTP


Postfix is a free mail transfer agent that uses SMTP to route and deliver emails. This tutorial shows how to configure Postfix to use an external SMTP server.

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How to Use telnet Command in Linux?

January 25, 2023

The telnet command allows users to establish an unsecure connection to remote servers or machines. This tutorial shows how to use telnet and showcases its useful features.

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How to Use The SSH Config File

January 19, 2023

Do you use the SSH config file? Learn how to utilize the SSH config file to automate and streamline SSH connections.

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How to Install Apache in Docker

January 17, 2023

Docker containers are particularly handy when an application such as a web server needs to preserve its configuration across different environments. This article demonstrates two methods to deploy Apache web server using Docker.

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