Learn how to fix 403 Forbidden Error with simple solutions. This guide shows quick fixes for server access problems on websites and apps. HTTP Error 403, known as the “403 forbidden error,” happens when a server denies access to a web page. Read on to learn how to solve this common error. Have you ever been blocked from accessing a website with a 403 Forbidden Error? A 403 Forbidden Error occurs when the server understands your request but refuses to authorize it. This could be due to a variety of reasons, such as permission settings, erroneous IP blocking, or outdated credentials.