How to forward port 8080 from VirtualBox to a physical server?

Question

virtual box

Good day!

Available:
1. Static IP address;
2. Server running Windows Server 2016;
3. Ubuntu Server in VirtualBox;
4. TP Link router with port forwarding 22 on Ubuntu Server and port 3389 on Windows Server.

Task: It is
necessary to forward port 8080 from Ubuntu Server (which is in VirtualBox'e) to Windows Server (physical server)

What was done:
1. Exceptions were created for incoming connection rules for port 8080 of TCP and UDP protocols;
2. Clarified the information with the provider - no ports are blocked or filtered;
3. Netstat does not see port 8080;
4. Port availability sites say that port 8080 is not available;
5. I tried many ways according to instructions from different sources.

Question: what should I do to make port 8080 in Windows Server visible from Ubuntu Server?

I will be glad to any comments and answers! I will provide all the necessary logs and data upon your request.

Strongly slippers do not throw, I'm a beginner

Answer 1

Do you have Ubuntu as a guest? and the main WinServer? Then, according to the normal - no way, the current through the "bicycle".
If the network is in bridge mode, then you can forward from TPlink to the Ubuntu IP, with Ubuntu already redirect to the WinServer IP by the firewall.
How is the network configured in VirtualBox - what network adapter mode is there?
Why can't you directly forward the port to WinServer? From TPlink?