# Collaborate not working on Tljh

**URL:** <https://discourse.jupyter.org/t/collaborate-not-working-on-tljh/21718>\
**Category:** The Littlest JupyterHub\
**Tags:** how-to, help-wanted\
**Created:** [October 2, 2023, 7:15pm UTC](https://discourse.jupyter.org/t/collaborate-not-working-on-tljh/21718 "2023-10-02T19:15:29Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![sab](https://avatars.discourse-cdn.com/v4/letter/s/7c8e57/32.png) [@sab](https://discourse.jupyter.org/u/sab)\
**Post date:** [October 2, 2023, 7:15pm UTC](https://discourse.jupyter.org/t/collaborate-not-working-on-tljh/21718/1 "2023-10-02T19:15:29Z")

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From several places on the internets I have been able to patch together the following setup:

- The Littlest Jupyter Hub installed on a AWS EC2 instance
- Added users in the Hub admin UI and added them to a “collaborate” group
- In each user’s Jupyter Lab I installed the extension jupyter-collaborate
- Added the following to /opt/tljh/config/jupyter\_config.d/jupyter\_config.py

```auto
c.Authenticator.allowed_users = set([
    ‘adminuser’,
    ‘user1’,
    ‘user2’,
    ‘user3’
])

c.JupyterHub.load_groups = {
    'collaborate’: [
        ‘adminuser’,
        ‘user1’,
        ‘user2’,
        ‘user3’
    ]
}

c.JupyterHub.load_roles = [
    {
        'name': ‘collaborate-group',
        'description': ‘users collaborate together’,
        'scopes': ['access:servers!group=collaborate’],
        'groups': [‘collaborate’],
    },
]

c.Spawner.cmd = [‘jupyter-labhub’]
c.Spawner.args = [‘—collaborate’]

```

While setting up this last part I was able to get the RTC collaboration working between my adminuser and a testuser. I got excited and removed the testuser and tried to connect the real user. But since then I have not been able to reproduce any working RTC. I can’t make the content appear between the users. I’ve tried sharing links and restarting the jupyter service after updating the config file, but have no success.

It’s been difficult to find a howto that includes the whole process in a complete manner. I have found information here and there, but it usually is missing the last last part in the Lab interface. I assume that’s part of the problem.

Does anyone have pointers to what I might be doing wrong or if I’m missing any steps?

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**Author:** ![ykazakov](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/ykazakov/32/6242_2.png) [@ykazakov](https://discourse.jupyter.org/u/ykazakov)\
**Post date:** [October 2, 2023, 9:31pm UTC](https://discourse.jupyter.org/t/collaborate-not-working-on-tljh/21718/2 "2023-10-02T21:31:13Z")

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Which version of Jupyterhub and Jupyterlab are you using?  
For the latest lab, the way to user RTC is to install the plugin `jupyter-collaboration`.  
Then with your config, `user1` should be able to share his server by clicking on the share link (upper right corner) with `user2` (logged in).

I recommend to first test your config with a docker before using any cloud provider. See, for example, [my recent post](https://discourse.jupyter.org/t/jupyterhub-4-0-x-with-jupyter-collaboration/20961).

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**Author:** ![sab](https://avatars.discourse-cdn.com/v4/letter/s/7c8e57/32.png) [@sab](https://discourse.jupyter.org/u/sab)\
**Post date:** [October 2, 2023, 10:35pm UTC](https://discourse.jupyter.org/t/collaborate-not-working-on-tljh/21718/3 "2023-10-02T22:35:13Z")

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I’m using Jupyterhub 4.0.2 and Jupyterlab 4.0.6.  
I get the share link from user1, but how do I use it with user2? Does it go in the File → Open from URL ? That gives me “Document session error”.  
I guess this step is what stumps me.

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**Author:** ![ykazakov](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/ykazakov/32/6242_2.png) [@ykazakov](https://discourse.jupyter.org/u/ykazakov)\
**Post date:** [October 3, 2023, 5:29pm UTC](https://discourse.jupyter.org/t/collaborate-not-working-on-tljh/21718/4 "2023-10-03T17:29:21Z")

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> [@sab](#):
>
> I get the share link from user1, but how do I use it with user2?

`user2` should be logged into the hub. Then just paste the link of the server of `user1` (`.../your/server/user/user1/lab/`) into the address of the browser window of `user2`.  
(I suggest to log `user2` in a different browser or in a private browser window so that the login tokens and cookies do not mix up)  
If something does not work, the log of `jupyterhub` should offer some hints.

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<div class="post-metadata">

**Author:** ![sab](https://avatars.discourse-cdn.com/v4/letter/s/7c8e57/32.png) [@sab](https://discourse.jupyter.org/u/sab)\
**Post date:** [October 3, 2023, 8:05pm UTC](https://discourse.jupyter.org/t/collaborate-not-working-on-tljh/21718/5 "2023-10-03T20:05:55Z")

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Now I got it! I didn’t think about it being this simple. Thank you for the help, now it’s working! 😀