"Replacing stale connection" -- Kernal cannot connect

[seanngpack]

Hi, does anyone have an input on my issue? I am running Jupyter from Anaconda and updated everything to the latest. When I enter the notebook on port 8888 it never connects to the kernel and I cannot run the cells.

I followed every single guide I could read and tried changing ports, deleting adblocks, and downgrading tornado to 5.1.1 but still no luck.

Thanks!

[jasongrout]

Can you try upgrading to notebook 5.7.5, just to make sure it's not the tornado incompatibility?

See #4439 and #4449.

[seanngpack]

Thanks! Figured out my issue was that I didn't have notebook installed.

[seanngpack]

Oops, false alarm wasn't notebook, still doesn't work
Upgraded notebook to 5.7.5, still issue.
Combinations I've tried:

• Notebook 5.7.5, tornado 6.0.1
• Notebook 5.7.5, tornado 5.1.1
• Notebook 5.7.4 tornados 6.0.1
• Notebook 5.7.4 tornados 5.1.1

[syagev]

I got the same issue after downgrading jupyter notebook from 5.7.6 to 5.7.4 due to #4467.
Indeed downgrading tornado down to 4.2.0 solved the issue.

[andrewm4894]

downgrading to tornado 5.1.1 worked for me.

[VSehwag]

Simply downgrading tornado to 4.2.0 worked for me.

[tranhungnghiep]

Upgrading tornado to the current version 6.0.4 fixed the issue for me.

[seshu2169]

upgraded notebook to 6.0.3 ,issue resolved

[HeloiseS]

downgrading to tornado 5.1.1 worked for me.

This also worked for me - I had the latest tornado version 6.0.4 and the downgrade fixed the pblm

[pdmptsjtsj]

I had the same problem when opening bash notebooks (not with python notebooks). Downgrading to different versions of tornado didn't help. Could this problem be related to port access?

[duongkstn]

Thanks everyone, I downgraded tornado==5.1.1 to replaced 6.0.3 version, then jupyter (jupyter-notebook==5.6.0, jupyter core==4.6.1) works properly.

[paultimothymooney]

Likewise, I was unable to start a new Jupyterlab session because of the "replacing stale connection" error message, but then I fixed the problem by running "pip install tornado==5.1.1" to downgrade from the latest available version. This thread was helpful for solving that error, thank you.

[Isayiyas]

Thank you guys. It worked for me too: tornado==5.1.1 + jupyter notebook 5.6.0 !