OnDemand: Web Socket Error for Shell, RStudio, etc

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1

When install the latest OnDemand, I can get most functionality to work including Matlab/X11. However when clicking on the button to open a shell (on the launch card) it gives a “Failed to establish a websocket connection. Be sure you are using a browser that supports websocket connections.”

This also happens when trying to get RStudio and other non-X11 apps working. Interestingly enough testing manually via a slurm allocation, using nc to listen on a port and them browsing to that node with OnDemand works just fine.

Basically the opposite of the problems I had when installing previous, but that is far more likely to do with me than anything else.

Any ideas?

2

For the shell app you’re probably running allowlists, you have to add every host you’re going to allow sshing into.

https://osc.github.io/ood-documentation/master/customization.html#set-ssh-allowlist

For Rstudio and other non-X11 apps I’m not sure what’s going on there. non-X11 apps don’t even use websockets so we’d need some more info on what error messages you’re seeing.

3

Jeff, that fixes the shell app issue when connecting up from launch cards, thanks! I’ll look into Rstudio more and see if i can replicate the issue with something else and provide more debugging information. I’m the first to admit it doesn’t really make sense.