I did just solve the problem. However I’m not certain which change actually solved the issue, I suspect it was the Hyper-V Virtual Ethernet Adapter causing the problem.
I have 3 Network Interfaces, a TAP-Windows Adapter V9, a Realtek PCIe GBE Family Controller, and a Hyper-V Virtual Ethernet Adapter. All 3 interfaces were enabled, however the TAP interface showed Network Cable Unplugged so I don’t believe that was the issue.
Either way I disabled both the TAP and the Hyper-V Adapter and then tried launching Rhino. This time Rhino opened up my Web Browser as expected and allowed me to use my Rhino License.
Hyper-V Virtual Ethernet Adapter appears to be the culprit. I suspect somehow your code is looking for a specific network adapter, and is choosing the wrong device. Then fails to get access to the network.
I don’t see any way to Logout or Disconnect my license so I cannot give you a definite answer on which change fixed the issue.