Guide

421 Misdirected Request Error: What is it and how to fix it?

What is a 421 Misdirected Request Error

In this blog post, we will explain what the HTTP 421 Misdirected Request Error is and how to fix it.. The HTTP 421 status code indicates that the client’s request sent to a web server is unable to be processed. This occurs because the server is not configured to handle that. It typically occurs when a server receives a request for a domain that is not authorized to respond to. This is usually with multiple domains with shared SSL certificates. We will explain a little bit more about the HTTP 421 code, its causes and how to fix it.

Fixing the HTTP 421 is straightforward, and you will need around 10 minutes to read and understand it. Let’s get started!

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303 Error: What Is It and How to Fix It?

What is a 303 error and how to fix it?

When browsing the web or working on a new project, you may encounter different HTTP status codes. Among the less common is the HTTP 303 error, also known as “See Other.” Understanding what it means and how to handle it properly can be crucial. This is especially true for developers working with APIs, form submissions, or redirects.

In this article, we’ll break down what the 303 error means. We’ll cover when it appears, and how you can fix or use it effectively.

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Email protocols: What is the difference between SMTP, POP3, and IMAP?

Email Protocols What is the difference between SMTP, POP3, and IMAP?

In this tutorial, we will explain the difference between the SMTP, POP3, and IMAP email protocols. Email protocol is a set of commands for sharing mail between two machines such as computers, and servers. This allows clients to send and receive email. There are a few email protocols, but the most common protocols are POP3, IMAP, and SMTP. In the following paragraphs we explain what defines them and their differences.

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Tools for Monitoring Network Bandwidth on Linux

tools for monitoring network bandwidth in linux

In this tutorial, we are going to show some tools for monitoring Network bandwidth on Linux.

Network bandwidth is a measurement indicating the capacity of data transmitted over a network in a given amount of time. It is normally represented by a number of bits, kilobits, megabits, or gigabits transmitted in 1 second.

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How To Install OpenNMS on Debian 11

how to install opennms on debian 11

In this tutorial, we are going to explain to you in step-by-step detail how to install OpenNMS on Debian 11 OS.

OpenNMS is a free and open-source network monitoring platform written in Java language. It is developed by a group of developers, users, and the OpenNMS community, which makes the software compatible with multiple operating systems such as Linux, Windows, macOS and etc. There are many features offered by this software, such as service assurance, service monitors, grafana support, easy integration, etc.

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How to Install Mailman3 on Debian 11

install mailman 3 on debian 11

Mailman is an open-source application for managing electronic mail discussions and newsletter lists. It is written in Python, and since Python 2.7 is EOL, it is important to use Mailman3, not Mailman2. Mailman 3 is actually a suite of 6 subprojects; it is known as The Mailman Suite:

  • Mailman Core – The core delivery engine.
  • Postorius – A new Django-based web user interface for end users and list administrators.
  • HyperKitty – A new Django-based web archiver.
  • mailman-hyperkitty – A plugin for the core to communicate with HyperKitty.
  • django-mailman3 – Django modules and templates common to Postorius and HyperKitty
  • mailmanclient – The official Python 2 and 3 bindings to the administrative REST API.

In this tutorial, we will show you how to install Mailman3 on Debian 11.

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How to Install Moodle on AlmaLinux 9

install moodle on almalinux

Moodle is an open-source platform for online learning. It is a Learning Management System used by educational institutions that enable them to create online courses, training, learning and assignments. Originally, Moodle was known as an acronym for Modular Object-Oriented Dynamic Learning Environment. In this tutorial, we will show you how to install Moodle on AlmaLinux 9.

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10 Useful tar Commands in Linux With Examples

useful tar commands in linux

This blog post will show you the ten most used tar commands in Linux with examples.

The tar command in Linux provides archiving functionality for compressing or decompressing archive files and modifying and maintaining them. With the tar command, we can create tar, gz, bz2 and gzip archives. Administrators use these commands when they want to save some disk space on the servers or when they are migrating files over two host machines.

In this tutorial, we are going to execute the tar commands on Ubuntu 22.04 OS, but you can choose any Linux distro. Let’s get started!

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5 Most Used alias Commands in Linux With Examples

most used alias commands in linux

This tutorial will show you the five most used alias commands in Linux with examples.

Sometimes we need to reference some command using it with a shortcut. These commands with shortcuts defined in Linux are called <b<aliases. Aliases are used to replace long commands in order for the user to avoid spelling errors. Some administrators or regular users are using aliases because they are used to executing some commands with their own Linux language words that have been used over the years.

In this tutorial, we are going to use the latest Ubuntu 22.04 distribution. You can choose any Linux distro you want. Let’s get started!

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