In my home situation I have Nextcloud running on a Raspberry Pi3 and I managed to install Collabora CODE on a 64 bit atom n570 device (it ain't much but it is for testing and learning purposes)
Now I only have on IP address and have port forwarding enabled on my router to the nextcloud pi.
192.168.1.80 (multiple virtual hosts there on webmin/virtualmin, DNS managed on Cloudflare)
The n570 with collabora is running on 192.168.1.70
Now do I put the sample vhosts file as in https://nextcloud.com/collaboraonline/ on a vhost on pi with ip 192.168.1.70 instead of the 127.0.0.1? Whatever I do, I get access denied. On ip 192.168.1.70:9980
Or do I need a reverse proxy running between the router forwarding the correct traffic to the right IP
Any ideas on how to do it?