# Julia kernel failed

**URL:** <https://discourse.jupyter.org/t/julia-kernel-failed/25288>\
**Category:** JupyterLab\
**Created:** [April 22, 2024, 4:42am UTC](https://discourse.jupyter.org/t/julia-kernel-failed/25288 "2024-04-22T04:42:20Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ytdHuang](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/ytdhuang/32/10865_2.png) [@ytdHuang](https://discourse.jupyter.org/u/ytdHuang)\
**Post date:** [April 22, 2024, 4:42am UTC](https://discourse.jupyter.org/t/julia-kernel-failed/25288/1 "2024-04-22T04:42:20Z")

</div>

I’m using JupyterHub and JupyterLab, and I have many kernels (including Python and Julia kernels).

All the other kernels work fine, but when I try to launch the Julia kernel, the kernel status shows “disconnected” and then changed into “No Kernel | Unknown”.

I look into the console of the browser:  
failed: WebSocket is closed before the connection is established.

I have another server which has the same OS, same version of jupyterhub==3.1.1, jupyterlab==4.1.6, Julia v1.10.2, and same configurations.

Does anyone have any idea ?