How do I fix a 403 error when caused by a missing index file?

If you're seeing a 403 error when trying to access a directory, and directory listing is disabled, ensure you have a default index file (like index.html, index.php, etc.) present in that directory. The server will attempt to load this file when a directory is requested. Upload an appropriate index file to the directory, or if you intend to show directory listing, you'll need to configure your server accordingly.