Hi @george1977, I’m assuming the 2nd computer is in the same network as the Ubuntu server. By default two computers would see each other based on their IP addresses. For example: 192.168.2.34 and 192.168.2.67 are both in the 192.168.2.x network. I’m oversimplifying this, obviously, but check your addresses to see if they are in the same network.
Corporate routing rules sometimes prevent seeing into a different network. What happens when you try http://my.ip.address?