I've experienced several times now losing access to the Sage notebook
files I've created using VirtualBox.

After a period of smooth use, I might try again to open Firefox from
within VirtualBox, and I'll be greeted with the message "Firefox can't
establish a connection to the server at localhost:8000".  When I get
that message, I also cannot access those Notebook files with the usual
Firefox under Windows, nor with any other browser.

I am able to re-import the Sage appliance, and I can get myself up and
running again with a new set of Notebook files, but I seem to have
lost access to the first set.  They must still exist - but how to
access them?

I'm wondering if the problem could have anything to do with using the
Virtual Firefox to go online?  From within VirtualBox I had Notebook
open both locally and online in order to easily transfer files.  So
far it has always been after doing that that the message appears on
the next attempt to open Notebook from within VirtualBox.

Thanks,

Michel

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