Here is my setting for the global
<Directory /var/www/html>
Require all denied
</Directory>
but if I change the filename of index.html to index1.html, then it works.
The virtual host configuration is default:
<VirtualHost *:80>
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>