Connection to trame widget and ports

[paskino]

I'm connecting to a server via an SSH tunnel. Trame uses a port I don't know for it's connections and because that's not forwarded "Firefox can’t establish a connection to the server at localhost:46139."

How do I go about fixing this?

[jourdain]

Setup a port forwarding on your ssh connection and force a specific port using the --port xxxx args (rather than --port 0).

[paskino]

Thanks, I should have said that my trame app is in jupyter lab.

As such I opened a connection to jupyter on port 8888, however I don't know how to control the port trame wants to use.

[jourdain]

Ah, then you should use the proxy infrastructure of Jupyter Lab. Meaning use the port 8888 but with a special url path to go through the jupyter proxy.

Can you be more explicit on the full process you are doing/trying-to-do?

[paskino]

Hi, @jourdain

I start jupyter as jupyter lab meaning that it will connect on port 8888.

The problem arises if I connect to the jupyter server via an ssh tunnel (ssh -L8888:localhost:8888 my_machine) then running the code below yields the error "Firefox can’t establish a connection to the server at localhost:46139."

I assume trame connects the client on a random port (46139) but that is not open, hence my error.

On the contrary if I am on the same network and I can connect on all ports everything is fine.

My code is here https://github.com/paskino/trame-course/blob/cilviewer_jupyter/vtk/Untitled.ipynb it's work in progress, at any rate the lines I am running are

from cilviewer_jupyter import iviewer
import vtk

reader = vtk.vtkMetaImageReader()
reader.SetFileName("head_uncompressed.mha")
reader.Update()

iv = iviewer()
iv.setInput(reader.GetOutput())

await iv.ui.ready
iv.ui

[jourdain]

Can you install trame-jupyter-extension in your jupyter setup?

[paskino]

It's installed trame-jupyter-extension 2.1.4
Maybe the environment is slightly old.

[jourdain]

You need to enable it within Jupyter Lab too.

[paskino]

Is this not automatic? https://github.com/Kitware/trame-jupyter-extension#development-install it says that running the below command is for the development mode, and I could not find any other mention of enabling the widget.

jupyter server extension enable trame-jupyter-extension

To be more complete, my example is basically running a trame.widget.vtk.VtkRemoteView whose render window is defined by a class of mine.

[jourdain]

If trame-jupyter-extension is enable and working all the network will go through the existing jupyter port / server.

In the web ui, there is a section on the left that let you check the extension and if they are enabled or not.