mrmarkuz
(Markus Neuberger)
2
I assume you need a valid certificate like letsencrypt.
You could try to use FQDN instead of IP like https://sub.domain.de/nextcloud/ instead of https://1.2.3.4/nextcloud.
Another way is to disable the certificate check (don’t know if it works for internal onlyoffice):
If it’s still not working you may try the external onlyoffice:
https://wiki.nethserver.org/doku.php?id=onlyoffice