How to access Virtual machine server from another host on the same network?

On the preferences window of your virtualbox (not the virtual machine) go to network and open the properties of your natnetwork.

There locate the port forwarding button (clic on it)

In the resulting window add your rule, the name is not relevant.

First your computer IP and port, then the IP of your virtual machine attached to your NATNETWORK and the port.

In my case used 192.168.1.102:8069 for the host and 10.0.2.7:8069 for the guest.

So now I can access my server from any computer on my LAN.

I hope this is useful for you.

Best regards,