Hello, I'm having trouble forwarding the ports for a http or https remote access to the DVR dahua dh-xvr1b16h webpage from the WAN (I can access withouth problems from LAN)

I have a VPN port forwarded (1194) and it works perfectly.

I also created a Python https server in a win10PC in port 7800 and I can also access from WAN using the externalIP:62000

However, the 8085/8086 ports remain closed.

I ran a Nmap scan from a external PC and checked that the 1194(VPN) is open, and the 62000(HttpServer) is ONLY open when the Python service is open. if it's not, the port is filtered. The 8085/86 is filtered.

I arrived to the conclusion that the TP-Link only opens a virtual server port when it detects that a service is listening to that port, it nothing is on then it's closed.

The problem is that the router doesn't detect the DVR and thus the port is not opened.

Any ideas?