Many thanks for your answer.

I do agree that matplotlib or pylab might be causing this issue. However, 
in jupyter notebook, we can control the invoking of these libraries using 
"c.NotebookApp.pylab = 'disabled' " command in jupyter_notebook_config.py 
file. Such an option doesn't exist in jupyterhub_config.py file. How can we 
disable pylab or matplotlib at the initialization of jupyterhub?

On Saturday, August 20, 2016 at 8:45:58 AM UTC-7, takowl wrote:
>
> Is it possible that something when a kernel starts is loading matplotlib 
> (or pylab)? IPython itself shouldn't need an X server, but some matplotlib 
> backends might.
>
> On 20 August 2016 at 01:02, Sachin Mehta <[email protected] 
> <javascript:>> wrote:
>
>> Whenever I create an empty notebook in JupyterHub, I get the following 
>> error (irrespective of the python version):
>>
>> : cannot connect to X server
>>
>> I logged into the server with ssh + X11 forwarding.
>> P.S.: I am starting the jupyterhub with --no-ssl command
>>
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