How to resolve a 403 error when accessing a specific directory?

If the error occurs when accessing a specific directory, investigate the permissions of that directory and its contents. Ensure the web server user has read and execute permissions on the directory and read permissions on the files within it. Double-check any `.htaccess` rules that might be applied to that directory. Consider if directory indexing is enabled incorrectly. Also verify if any access control lists (ACLs) are in place and correctly configured.