I have installed openproject as Docker compose under openmediavault (OMV) and I use a Fritzbox with port sharing to access from the internet.
My hostname is server.local:8080
When I access locally in the LAN, everything is fine. But when I access from the Internet via my Fritzbox, I get an error message that there is a hostname mismatch. The hostname should be myspecialurl.myfritz.net

How do I resolve this?