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404 is one of the standard status codes in Hypertext Transfer Protocol. It tells a web user that a requested page is not available. 404 error codes generate when a user attempts to access a webpage that does not exist or has a dead or broken link. The 404 code means that a server could not find a client-requested webpage. The error code is one of the most frequent errors a web user encounters. It messes up a user’s online experience. A user can face 404 in a variety of ways. It may happen that they are following a link that itself leads to a 404. A bookmark may lead to a dead-end. 404 links also appear on other websites or through search engines.

404 Error
  Access issue 

•   Redirected incorrectly
•   Page deleted
•   Page moved

URL issue

•   Non-existent domain name
•   Incorrect “friendly URLs” path
•   Disabled URL rewriting mode (mod_rewrite)
•   Incorrect link/ Misspelled URL

Config issue

•   Problem in .htaccess file
•   Wrong SSL certificate configuration

Memory issue

•   Memory limit on hosting

Permission issue

•   Authorization problem

Other issue

•   Intentional illegal content blocking
•   Malfunctioning server
•   URL submitted for indexing

A thorough root cause analysis helps us identify the main reasons for the 404 error. This fishbone template holds the causes for which a server replies back with 404. The parent or first-level causes represent different cause categories.

Who should use the 404 Error template?

• Anyone who needs to understand the potential causes for getting 404 Error – Page Not Found from HTTP requests / URLs in the browser

Why use this template?

• Recognize reasons why a 404 Error has occurred
• Change and reuse this template using smartQED
• Create your own templates for any type of problem analysis in smartQED

Curated from community experience and public sources:

• https://www.prestashop.com/en/blog/404-not-found-error-how-to-fix-it