# Jupyter Notebook window won't open after Catalina upgrade

**URL:** <https://discourse.jupyter.org/t/jupyter-notebook-window-wont-open-after-catalina-upgrade/3065>\
**Category:** General\
**Created:** [January 15, 2020, 4:50pm UTC](https://discourse.jupyter.org/t/jupyter-notebook-window-wont-open-after-catalina-upgrade/3065 "2020-01-15T16:50:41Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![Simon\_Evans](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/simon_evans/32/1468_2.png) [@Simon\_Evans](https://discourse.jupyter.org/u/Simon_Evans)\
**Post date:** [January 15, 2020, 4:50pm UTC](https://discourse.jupyter.org/t/jupyter-notebook-window-wont-open-after-catalina-upgrade/3065/1 "2020-01-15T16:50:41Z")

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Hi there,  
I was happily using Jupyter Notebook via Anaconda Navigator until upgrading to MacOS Catalina late last year. Since then I have tried…

- reinstalling Navigator via the pkg and command line
- setting up a conda env

…but to no avail, when I try to run Jupyter Notebook I get a window opening in Chrome (or Firefox or Safari) stuck at “waiting for localhost”. The same issue if I use the localhost URL directly.

Any suggestions gratefully received!  
Thanks,  
Simon

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**Author:** ![scbarton](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/scbarton/32/137_2.png) [@scbarton](https://discourse.jupyter.org/u/scbarton)\
**Post date:** [January 15, 2020, 6:29pm UTC](https://discourse.jupyter.org/t/jupyter-notebook-window-wont-open-after-catalina-upgrade/3065/2 "2020-01-15T18:29:51Z")

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It sounds like the notebook server is not starting up properly. Try running the command `jupyter notebook` from command line in Terminal.app - what do you see? If you see a message like:

> The Jupyter Notebook is running at:  
> [http://localhost:8888/](http://localhost:8888/)

then try connecting to that URL. You may need to do this from within your conda env.

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**Author:** ![Simon\_Evans](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/simon_evans/32/1468_2.png) [@Simon\_Evans](https://discourse.jupyter.org/u/Simon_Evans)\
**Post date:** [January 15, 2020, 9:22pm UTC](https://discourse.jupyter.org/t/jupyter-notebook-window-wont-open-after-catalina-upgrade/3065/3 "2020-01-15T21:22:58Z")

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Hi @scbarton and many thanks for the response.

Attached is a screenshot of the Terminal window…

 ![Screenshot 2020-01-15 at 21.20.05](https://canada1.discourse-cdn.com/flex031/uploads/jupyter/original/2X/f/f64e472b3621de1c95e9e0a9e6ab8747f5526940.png)

…unfortunately if I copy and paste the highlighted link ([http://localhost](http://localhost)…) I get the same outcome ie a tab in Chrome with a little loading wheel of doom and a message saying “Waiting for localhost…” at the bottom of a blank window.

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**Author:** ![Azucena\_Coronel](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/azucena_coronel/32/1636_2.png) [@Azucena\_Coronel](https://discourse.jupyter.org/u/Azucena_Coronel)\
**Post date:** [February 29, 2020, 9:55am UTC](https://discourse.jupyter.org/t/jupyter-notebook-window-wont-open-after-catalina-upgrade/3065/4 "2020-02-29T09:55:50Z")

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Hello!

Were you able to solve these issues?  
I’m experiencing exactly the same and running out of ideas. My environment is:  
macOS Catalina 10.15.3  
Anaconda 2019.10  
jupyter 1.0.0

And tried to access [http://localhost:8888/](http://localhost:8888/)  
in Chrome, Chrome Incognito and Safari without any success.

Any direction would be greatly appreciated!

UPDATE after reinstalling I am able to access via 127.0.0.1:8888/lab  
localhost:8888/ is still not resolving, but that’s a different issue.

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**Author:** ![willtraweek](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/willtraweek/32/1650_2.png) [@willtraweek](https://discourse.jupyter.org/u/willtraweek)\
**Post date:** [March 3, 2020, 5:29am UTC](https://discourse.jupyter.org/t/jupyter-notebook-window-wont-open-after-catalina-upgrade/3065/5 "2020-03-03T05:29:40Z")

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I’m running into this same issue. Unable to access localhost, but by typing in the local IP, I can access my jupyter notebooks. Has anyone else run into this issue?

Exact same setup and versions as @Azucena_Coronel above.

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**Author:** ![ppushp7](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/ppushp7/32/2037_2.png) [@ppushp7](https://discourse.jupyter.org/u/ppushp7)\
**Post date:** [May 8, 2020, 4:28pm UTC](https://discourse.jupyter.org/t/jupyter-notebook-window-wont-open-after-catalina-upgrade/3065/6 "2020-05-08T16:28:21Z")

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Hey the solution to all the issue is explained here

> **[How to run jupyter notebook on MacOS Catalina in four steps.](https://medium.com/@pushkarpushp/how-to-run-jupyter-notebook-on-macos-catalina-in-four-steps-f7cc4e2cc270#ffaf-afae6163858d-reply)**
>
> In my previous blog , I walked you through all steps to run a jupyter notebook. If you’re a data scientist or developer and upgraded to…

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<div class="post-metadata">

**Author:** ![erselbey](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/erselbey/32/2088_2.png) [@erselbey](https://discourse.jupyter.org/u/erselbey)\
**Post date:** [May 18, 2020, 7:02pm UTC](https://discourse.jupyter.org/t/jupyter-notebook-window-wont-open-after-catalina-upgrade/3065/7 "2020-05-18T19:02:46Z")

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Open: vim .jupyter/jupyter\_notebook\_config.py

find \> c.NotebookApp.ip = ‘localhost’  
Change \> c.NotebookApp.ip = ‘127.0.0.1’

Remove the # sign at the beginning, though.

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**Author:** ![ldalcaraz](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/ldalcaraz/32/3442_2.png) [@ldalcaraz](https://discourse.jupyter.org/u/ldalcaraz)\
**Post date:** [January 8, 2021, 7:08pm UTC](https://discourse.jupyter.org/t/jupyter-notebook-window-wont-open-after-catalina-upgrade/3065/8 "2021-01-08T19:08:27Z")

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Just upgraded to Big Sur, and it stopped working, the solution was easier than I thought:

[xcode - Why am I getting an “invalid active developer path” when attempting to use Git after upgrading macOS? - Ask Different](https://apple.stackexchange.com/questions/254380/why-am-i-getting-an-invalid-active-developer-path-when-attempting-to-use-git-a) \<- look 2625

If you are lazy open terminal and:

```auto
xcode-select --install

```