OK, here's what I did and here's what happened.

ssh'd to Sage server as normal (non-root) user, started sage.  At sage
prompt:

sage: notebook(address="",open_viewer=False)

This produced the output appended.

Then, in a browser on a separate Linux machine,
I entered a URL of http://128.N.NN.NNN:8000/,
where 128.N.NN.NNN is the IP address of the Sage server.
In trying to connect, the browser then displays the following:

     "Failed to Connect

     Firefox can't establish a connection to the server at
128.N.NN.NNN:8000.

     Though the site seems valid, the browser was unable to establish
a connection.

    * Could the site be temporarily unavailable? Try again later.
    * Are you unable to browse other sites?  Check the computer's
network connection.
    * Is your computer or network protected by a firewall or proxy?
Incorrect settings can interfere with Web browsing."

Is there something I'm not doing, or doing incorrectly?

Thanks again for the help,
-Richard Vaughn

**********************************************************************
WARNING: Running the notebook insecurely not on localhost is dangerous
because its possible for people to sniff passwords and gain access to
your account. Make sure you know what you are doing.
**********************************************************************
The notebook files are stored in: sage_notebook.sagenb
**********************************************************************
WARNING: Insecure notebook server listening on external address.
Unless you are running this via ssh port forwarding, you are
**crazy**!  You should run the notebook with the option secure=True.
**********************************************************************
**************************************************
*                                                *
* Open your web browser to http://localhost:8000 *
*                                                *
**************************************************
2009-12-22 09:43:35-0500 [-] Log opened.
2009-12-22 09:43:35-0500 [-] twistd 8.2.0 (/usr/share/sage-4.2.1/local/
bin/python 2.6.2) starting up.
2009-12-22 09:43:35-0500 [-] reactor class:
twisted.internet.selectreactor.SelectReactor.
2009-12-22 09:43:35-0500 [-] twisted.web2.channel.http.HTTPFactory
starting on 8000
2009-12-22 09:43:35-0500 [-] Starting factory
<twisted.web2.channel.http.HTTPFactory instance at 0x2ab1ce8d40>








On Dec 21, 4:19 pm, William Stein <wst...@gmail.com> wrote:
> On Mon, Dec 21, 2009 at 12:20 PM, rvaug...@gmail.com <rvaug...@gmail.com> 
> wrote:
> > OK, I did "sage: notebook(address="", open_viewer=False)"
> > and got the appended.
>
> > So now how does a remote user access this Sage instance
> > via his browser?  What would the URL be?
>
> If the ip address of the computer you run Sage on is foo.bar, you would use
>
>    http://foo.bar:8000
>
> William
>
>
>
>
>
> > Thanks very much,
> > -Richard Vaughn
>
> > ======================================================================
>
> > sage: notebook(address="", open_viewer=False)
> > **********************************************************************
> > WARNING: Running the notebook insecurely not on localhost is dangerous
> > because its possible for people to sniff passwords and gain access to
> > your account. Make sure you know what you are doing.
> > **********************************************************************
> > The notebook files are stored in: sage_notebook.sagenb
> > **********************************************************************
> > WARNING: Insecure notebook server listening on external address.
> > Unless you are running this via ssh port forwarding, you are
> > **crazy**!  You should run the notebook with the option secure=True.
> > **********************************************************************
> > **************************************************
> > *                                                *
> > * Open your web browser tohttp://localhost:8000*
> > *                                                *
> > **************************************************
> > Removing stale pidfile /home/rvaughn/.sage/sage_notebook.sagenb/
> > twistd.pid
> > 2009-12-21 15:16:51-0500 [-] Log opened.
> > 2009-12-21 15:16:51-0500 [-] twistd 8.2.0 (/usr/share/sage-4.2.1/local/
> > bin/python 2.6.2) starting up.
> > 2009-12-21 15:16:51-0500 [-] reactor class:
> > twisted.internet.selectreactor.SelectReactor.
> > 2009-12-21 15:16:51-0500 [-] twisted.web2.channel.http.HTTPFactory
> > starting on 8000
> > 2009-12-21 15:16:51-0500 [-] Starting factory
> > <twisted.web2.channel.http.HTTPFactory instance at 0x2ab1ce8d40>
>
> > On Dec 21, 2:42 pm, William Stein <wst...@gmail.com> wrote:
> >> On Mon, Dec 21, 2009 at 11:30 AM, rvaug...@gmail.com <rvaug...@gmail.com> 
> >> wrote:
> >> > OK.  Let me see if I understand this.
> >> > I ssh into the machine running Sage.
> >> > I execute "sage" and see this:
>
> >> > sage:
>
> >> > I then add the following after the "sage:" prompt:
> >> >    notebook(address="192.NN.NN.NNN")
> >> > where 192.NN.NN.NNN is the IP address of the machine of...
> >> > the client machine from which I want to run sage remotely via a
> >> > browser?
> >> > or the 'server' machine on which the Sage instance is running?
>
> >> > Thanks,
> >> > -Richard Vaughn
>
> >> To repeat what I wrote above:
>
> >> The notebook only listens on localhost by default.  Use
>
> >>     sage: notebook(address="", open_viewer=False)
>
> >> to listen on any port...
>
> >> William
>
> > --
> > To post to this group, send email to sage-support@googlegroups.com
> > To unsubscribe from this group, send email to 
> > sage-support+unsubscr...@googlegroups.com
> > For more options, visit this group 
> > athttp://groups.google.com/group/sage-support
> > URL:http://www.sagemath.org
>
> --
> William Stein
> Associate Professor of Mathematics
> University of Washingtonhttp://wstein.org

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