Merlin helped me offline with this (thanks, dude). The issue was port choice. 6668 was insecure. You may want to check out:
http://www.networksorcery.com/enp/protocol/ip/ports06000.htm
If your jupyter is not working over the network.
Hello, I am coming back to this old post because I do not manage to run ds9 through the lsst-lspdev jupyterLab. Did anyone succeed?
The above instructions won’t work with LSST-hosted Jupyterlab installations (lsst-lspdev, etc.), because you can’t SSH to the jupyter instances.
From private conversations, it sounds like it actually should be/is possible to setup the necessary tunnels by ssh-ing out, but this should be considered unsupported at best!