jupyterhub: kernel starts but notebook cannot connect

[hokie...@gmail.com]

Hi Everyone,

I am running jupyterhub within a Docker container behind an nginx proxy and it's been working really well for several months.

I now have a user who can launch a python2 or python3 kernel but then cannot connect. I don't see any errors in either the jupyterhub or nginx logs.

Any recommendations as to how to troubleshoot this further?

--John

[MinRK]

When an additional proxy is in front, such an error generally means that the proxy isn’t proxying websocket connections correctly, which requires some extra configuration.

In nginx config, this can look like:

map $http_upgrade $connection_upgrade {
  default upgrade;
  '' close;
}
...
location / {
  ...
   proxy_set_header Upgrade $http_upgrade;
   proxy_set_header Connection $connection_upgrade;
}

-Min

​

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