Trouble connecting to remote Isaac sim headless

I installed Isaac Sim on Ubuntu 20.04 machine. When I start it in headless mode I can use the client to connect to it, but when I am trying to access it through the client or WebRTC from another PC, with Windows 11, I cannot. An empty dark screen starts and then disappears. I see the following window then:
Unable to initiate a connection to the server. Please validate the server address ia accurate, and that it is reachable from the network.


I can ping it:
image
And I also opened all the ports for inbound and outbound for PC and Linux: TCP/UDP 47995:48012 , TCP/UDP 49000:49007 , and TCP 49100

looks like you were able to get it resolved by ensuring the Nucleus server is running 🙌 just going to link to the other thread here for potential users facing this issue:

and hopefully the doc’s team can add that note in the doc somewhere

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