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

September 15, 2025

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!

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

August 30, 2025

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.

HTTP Error 407 “Proxy Authentication Required”: What is it and how to fix it?

April 15, 2025

How to fix HTTP 407 Error Proxy Authentication Required

This tutorial explains the HTTP Error 407 Proxy Authentication Required error, what causes it, and how to fix it. The following error can cause website downtime, which may decrease the website’s reputation and make clients unsatisfied. The HTTP 407 Error typically occurs when the client cannot auhenticate with a proxy server. Similarly, when the proxy server cannot allow access to the requested resource without authentication. Identifying the root cause of this error can be difficult but we will show you a couple of possible solutions.

550 Permanent Failure for one or More Recipients and How To Fix It

March 30, 2025

In this blog post we will talk about the most common error “550 permanent failure for one or more recipients”. This SMTP (Simple Mail Transfer Protocol) error occurs when the recipient mail server blocks email. There are various reasons for this such as restrictions, blacklisted IP addresses, bad DNS records, etc. We cannot know what the exact issue is. Therefore, we need to investigate to confirm if it is related to the sender’s or the recipient’s mail server. In the next paragraph, we will explain what steps need to be taken to detect what makes this issue appear.

SSL Connection Error? Here’s how to fix it!

August 30, 2024

What are SSL certifications, and what is an SSL connection error? SSL stands for Secure Socket Layer and is a security protocol that provides authentication, integrity, and privacy to Internet Communications. It is the predecessor to the TLS encryption used today. A website that implements SSL/TLS has “HTTPS” in the URL, unlike an unsecured website that has “HTTP.” SSL encrypts data transmitted across the web and initiates a handshake authentication process.

SSL certificate is like an ID card that proves the website’s identity. The web server stores the SSL certificates, including the private key, ca-bundle, and certificate files. SSL certificates are essential for a website because they provide an extra layer of security. There are free and paid certificates. Free can install the free certificates Let’s Encrypt, Zero SSL, and BuyPass providers. While the paid ones are provided by the certificate authorities such as Comodo, Sectigo, GeoTrust, Thawte, etc

In the next paragraphs, we will give you some tips on how to fix SSL connection errors in your browser if you are a client or on the server if you are the website’s owner.

400 Bad Request Error? Here’s How to Fix It!

August 15, 2024

One of the most common and frequently encountered HTTP status codes when opening a URL is the “400 Bad Request Error”. Perhaps you’ve experienced times when a web page you wanted to visit suddenly became inaccessible, and the first thing that appeared was an error message that didn’t detail the cause. This article will discuss the 400 Bad Request Error, what caused it, and how to fix it.

What is 403 Forbidden error and how to fix it?

June 30, 2024

Most of you are familiar with the “403 Forbidden” error message or have at least run across it. Running into this error message on your computer or phone is equally annoying and frustrating. So, what does the 403 error mean, and what can you do about it?