C# kernel does not work at Jupyterlab/Notebook

Describe the bug

• C# kernels die / do not work, python works perfect, so not sure if this is a dotnet interactive or jupyterlab bug. See https://github.com/jupyterlab/jupyterlab/issues/13320

Please complete the following:

FROM jupyter/datascience-notebook:lab-3.5.0

USER root

# Install dotnet 6 sdk & runtime
RUN apt-get update && apt-get install -y dotnet6 && \
    apt-get clean && apt-get autoclean && apt-get autoremove --purge -y && rm -rf /var/lib/apt/lists/*

# Install .NET Interactive to support C# in Jupyter notebooks
ENV PATH="$PATH:/home/jovyan/.dotnet/tools"

USER 1000

RUN dotnet tool install -g --no-cache --version 1.0.350406 --add-source "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json" Microsoft.dotnet-interactive && \
     dotnet interactive jupyter install

• docker build -t testjupyter - < Dockerfile

• docker run -it -p 8888:8888 testjupyter start.sh "jupyter" "lab" "--log-level=DEBUG"

• OS

  • Windows 11
  • Windows 10
  • macOS
  • Linux (Please specify distro)
  • iOS
  • Android

• Browser

  • Chrome
  • Edge
  • Firefox
  • Safari

• Frontend

  • Jupyter Notebook
  • Jupyter Lab
  • nteract
  • Visual Studio Code
  • Visual Studio Code Insiders
  • Visual Studio
  • Other (please specify)

Screenshots

[yigitl]

I think I have the exactly the same issue but I’m not using a docker setup, I have my own VM. I am using TLJH if that is relevant. Is there a workaround for this?

• I can run notebooks with python kernel.
• When I open a notebook with F#-kernel, it says kernel starting, please wait... for a while, but it doesn’t start. It fails with A connection to the notebook server could not be established. The notebook will continue trying to reconnect. Check your network connection or notebook server configuration. after few minutes, and Not Connected after that.

Further information if needed:

dotnet --info

.NET SDK:
 Version:   7.0.102
 Commit:    4bbdd14480

Runtime Environment:
 OS Name:     ubuntu
 OS Version:  20.04
 OS Platform: Linux
 RID:         ubuntu.20.04-x64
 Base Path:   /usr/share/dotnet/sdk/7.0.102/

Host:
  Version:      7.0.2
  Architecture: x64
  Commit:       d037e070eb

.NET SDKs installed:
  7.0.102 [/usr/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 7.0.2 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 7.0.2 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
  None

Environment variables:
  Not set

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download

dotnet-interactive --version

1.0.360602+9bf026dabac44a6256a65168fa93dcb7e2edcca4

python3 --version

Python 3.9.7

jupyter --version

IPython          : 8.8.0
ipykernel        : 6.20.2
ipywidgets       : 7.7.2
jupyter_client   : 7.4.9
jupyter_core     : 5.1.5
jupyter_server   : 1.23.5
jupyterlab       : 3.5.3
nbclient         : 0.7.2
nbconvert        : 7.2.9
nbformat         : 5.7.3
notebook         : 6.5.2
qtconsole        : 5.4.0
traitlets        : 5.8.1

[bpazo]

This happens currently because the expected HTTP port is not being opened in your Docker setup. (The need for this port will be removed in an upcoming update to .NET Interactive.)

What is the expected port number that needs to be opened?