A 404 error message is a status code indicating the server could not find the requested website. In other words, it means that your browser connected to the server successfully, although the specific page you’re trying to access can not be found.
There are several reasons why your domain redirects you to a 404 error page or does not work at all:
You haven't added your new domain to your hosting account
You use HTTPS to load your website without installing SSL
You are mistyping the URL
The content you are trying to access is actually missing/deleted
If you registered a domain recently, you will need to wait for propagation which can take up to 24 hours
Your browser or local DNS is cached and you need to clear it
Your file and directories permissions are incorrect
In case you are using WordPress you can check these possible reasons as well:
Your permalinks are broken and need fixing
You have .htaccess redirect rules that are causing 404 errors, in this case, you can try replacing .htaccess with the default one
Your plugins are causing 404 errors, for this, you can try disabling them temporarily to see if it helps
That’s it! Now you know how to troubleshoot and fix 404 errors on your website 😊
NOTE
For detailed information on any 404 errors encountered on your website, you can check the Access Logs section on hPanel