Page http://nextcloud is Forbidden before activation becouse of router dhcpv6

System information
Page http://nextcloudpi is Forbidden before activation

The problem is in /etc/apache2/sites-enabled/ncp.conf
Because I use router with IPv6 with global IPv6 assignment. But there is no rule in apache to manage local or global ipv6 restriction. The solution is to replace with this

….
Require all granted

But then we have a security issue (Page of activation is exposed from the internet). To solve this, we need to move the activation page to url https://nextcloudpi:4443/. On url https://nextcloudpi/ we have to implement automatic redirect to url https://nextcloudpi:4443/ to activation page. So user do first run go https://nextcloudpi/ and Activation page is not exposed to internet from router forwarding port.

Inspect /etc/apache2/sites-enabled/ncp.conf and reproduce the Forbidden response with a router assigning global IPv6 addresses. Compare the IPv6 access restriction with the proposed Require all granted behavior, then verify that activation is available at https://nextcloudpi:4443/ while the HTTP entry point redirects without exposing activation through router port forwarding.