To block attacks to server_ip and port 443, add the following code to /etc/apache2/conf.d/includes/pre_virtualhost_global.conf
<VirtualHost IP_HERE:443>
<Location />
Deny from all
Redirect "/" "http://127.0.0.1/"
</Location>
</VirtualHost>
then save and restart apache.
To test, try visiting IP:443 in your browser.
