PFSense -> NGINXProxyManager -> OCIS (5.x.x / 6.x.x)

Hello.
I don’t know how to describe it exactly.
In my network there is a pfsense+ on which I direct all incoming connections on port 80 and 443 to a virtual nginxproxymanager instance.
All SSL certificates and all redirects to the individual services that I host for myself are provided on this nginxproxymanager instance.
I have a virtual OCIS instance which runs flawlessly in the local network and not so flawlessly via Internet access via the nginxproxymanager.
The best example of this is the ‘New file’ option.
If I use this option under OCIS in the local LAN via the local LAN address, the text editor opens and I can write my text.
If I do this via the FQDN, i.e. via the Internet access from outside, only a small message appears in the corner ‘Error creating the file’.
I have now tested this via a standalone installation as well as via a docker installation and in both cases I get the same results.
Does anyone have any idea how I can get this problem under control without installing nginx, apache or Traefik on the OCIS instance?
Thank you very much.

Nevermind.
I configured caddy as a reverse_proxy on a seperate virtual instance and it worked out of the box.
Sorry for the fuzz.

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