Comment (by Bill Gabella):

Just tried the login, https://etkhub.ndslabs.org/ , using the CILogon and then GitHub. That seems to be working as it puts me in a Jupyter notebook session with messages about trying to startup a server. After a bit (300secs) it fails. I will attach the failure.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2234/trouble-in-the-tutorial-server