If you're trying to access the Apache website with limited access from external IP addresses through an OpenVPN connection, you may need to adjust your configuration to allow traffic from the OpenVPN network.
Add add the following lineon your .htaccess.
Allow from <OpenVPN_client_IP_address>
Also check your Apache configuration and add the lne...
<Directory "/path/to/your protected_directory">
AllowOverride All
</Directory>
Then Restart Apache hope it work to you.