Thanks for the replies. Perhaps my misunderstanding is related to how the 
versioning notation works or my interpretation of the output. 

When I type `jupyter --version` I get back `4.2.1`, which is the version 
that I reported. When I started the notebook with `jupyter notebook 
--no-browser` the server output showed (with the token changing each time) :

`The Jupyter Notebook is running at: 
http://localhost:8888/?token=3ca89c7367e195991aaa103b444c12fb7e42b46e843c74cb` 

which created a re-direct (302) to a login page when I tried to open the 
page in emacs or in the browser (using only http://localhost:8888).

The emacs notebook developer responded with a workaround so I will try 
this, and if it doesn't work then I will try the (possibly flawed) 
solution. Thank you for both the pointer to the documentation, which I 
think I read but somehow did not understand, as well as the reasoning for 
the authentication. In my case I primarily use the notebooks as quick 
sketchbooks where I run the server on the same computer where the client is 
(and I have the only user account) so hopefully I won't have the  security 
problems mentioned.

In any case, thank you very much for your response.

Best Regards,
Rasso


On Saturday, December 10, 2016 at 4:26:48 PM UTC-8, Rasso Necromuralist 
wrote:
>
> Hello,
>
> My main way to use Jupyter notebooks is to spin up a local server and use 
> emacs-ipython-notebook (ein), but Jupyter 4.2.1 has the default set to 
> require passing in the token, which breaks ein. I filed a bug with the ein 
> developer, and in the mean-time I copied an older version of Jupyter over 
> to my virtualenv, so I'm not blocked, but I couldn't find an obvious way to 
> disable the authentication in the documentation and was wondering how I 
> could do it if I wanted to.
>
> Best Regards,
>
> Rasso
>

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