Fix WordPress Returning 404 – When you see this error in one of your pages while the others are working fine, you should try to update or your permalinks of reconfiguring them.
Fix WordPress Returning 404 – How to fix it:
- You just have to go to Settings > Permalinks then hit the save changes button. This will update the settings of your permalinks.
- If it does not fix the problem, you can try to manually update your .htaccess file. In order to do so, you will have to use FTP to login to your server and change the permission of your file to 666 to make it rewritable then repeat the first solution we mentioned above and change back your permission to 660.