No output in jupyter notebook

Same problem here. The app seems to run python on remote server and it won’t display any output if it can’t connect.

[Update]

Managed to solved the problem by forcing upgrade of jupyter notebook to 5.3.1

Warning: I don’t know of this will break anything in the virtual env

For conda:

conda install notebook=5.3.1

For virtualenv:

pip install notebook==5.3.1
pip3 uninstall tornado
pip3 install tornado==5.1.1

From: https://github.com/jupyter/notebook/issues/3247 and https://stackoverflow.com/questions/54963473/jupyter-notebook-failing-to-connect-to-kernel

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