Nextcloud on startup

I have a question regarding http configuration.
i have nethserver with nextcloud installed on it, and I already forward traffic from external ip to nethserver ip. How to prevent the welcome site with link to server administration to show up as the first site? I would like to forward it directly to nextcloud.

I just want to mention that Nethserver Nextcloud has a custom virtual host function:

To redirect to Nextcloud instead of showing the default page you may create the file /var/www/html/index.php with following content:

   header ("location:");

Found in this thread.