@mcuma thanks for the heads up to the rest of the community!
Yea in troubleshooting this issue in UGE Jupyter launch fails for UGE I happened to stumble across this ticket in jupyter https://github.com/jupyter/notebook/issues/4715 which someone says just a jupyter's update. but doesn’t seem to indicate why it was updated.
Did setting c.NotebookApp.ip = '0.0.0.0' happen to solve your issue? I think that config should backport to older versions as well. or maybe we should start supplying ${host} (which is just $(hostname)) there instead.