Apache2 shows default page even after disabling it

I've moved a wordpress site to an Ubuntu Server. While I access it from localhost everything works fine but when I try from my public IP address I can only see the apache2 default page.

I tried everything:

• Disabled 000-default.conf and enabled mine
• Deleted the default HTML page
• Added AllowOverride All

Here there's my Virtual Host file

<VirtualHost *:80>
        <Directory "/var/www/exidis">
                AllowOverride All
        </Directory>

        ServerName alternanza.duckdns.org
        ServerAlias www.alternanza.duckdns.org
        DocumentRoot /var/www/exidis

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

Thanks in advance for any suggestion