Jupyter notebook doesn't open: Access Denied


  • OS : Ubuntu 20.04
  • Distribution : Anaconda 2020.07 Linux x86_64
  • Current Default Browser : Firefox 81.0 64-bit

What I do:

  • Open terminal
  • cd to a specific path
  • Run jupyter notebook

What happens:

  • Firefox opens up but shows this message:
The requested URL could not be retrieved

The following error was encountered while trying to retrieve the URL: http://localhost:8888/tree?

    Access Denied.

Access control configuration prevents your request from being allowed at this time. Please contact your service provider if you feel this is incorrect.

Your cache administrator is root.

Note : I used to use Google Chrome as my default browser and it worked fine. But I decided to switch to Firefox and not once I could use Jupyter in Firefox.

P.S : I don’t want to switch back to Chrome again!

Problem Solved!
Using proxy via Firefox causes that.

1 Like