Trouble accessing local notebooks on firefox when disconnected from internet

[Florian Aspart]

Hi all,

I'm running a local jupyter notebook with https access only on ubuntu. I have no problem to connect to the notebooks and work with them as long as I'm connected to the internet.
However, when I disconnect internet, I cannot access the notebooks from Firefox (Chrome still works fine) anymore. For sure it's a configuration problem on my side, but I do not know where to look at (I disabled proxy in the settings of both browser).

Did someone have similar issue? Any idea where it could possibly come from?

Best,
Florian

[Roland Weber]

Hello Florian,

the browser probably pulls some JavaScript libraries from online locations. It seems that Chrome caches them more aggressively than Firefox. To verify, you can go offline and clear the browser cache in Chrome. It should then stop working, too ;-)

cheers,

  Roland

[Thomas Kluyver]

No, I don't think we're relying on any JS libraries fetched from the internet. It should work entirely offline. It sounds like some sort of proxy or DNS issue.

What address is it trying to connect to? If it's localhost, try 127.0.0.1 instead. If it's 127.0.0.1, try localhost.

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[Roland Weber]

On Monday, September 25, 2017 at 6:23:13 PM UTC+2, takowl wrote:

No, I don't think we're relying on any JS libraries fetched from the internet.

My mistake. It's nbconvert, not notebook, that refers to MathJAX by CDN.

[MinRK]

Under default configuration, the notebook shouldn't be pulling anything from the internet to run. What version of the notebook are you running (`pip list | grep notebook`)? Older versions of the notebook pulled mathjax from a CDN, but it doesn't load any remote javascript by default anymore.

-Min

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[Florian Aspart]

Thanks for the answers, they helped me better track my problem.

I can connect to the notebook "home" page but when I open a new kernel it cannot connect to it. Therefore it's definitely not a proxy issue.

I'm running the Notebook version 5.0 but I also have a bunch of nbextensions running. I think one of them is causing the problem: I disabled all of them and, though I initially need internet to start the notebook, I can still run the notebooks in firefox after turnin off internet.

I'll try to find which extensions does not work offline by disabling them one after the other and I'll report it in case somebody has the same problem.

Cheers,

Florian

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[Thomas Kluyver]

On 27 September 2017 at 09:54, Florian Aspart <florian...@gmail.com> wrote: 

I can connect to the notebook "home" page but when I open a new kernel it cannot connect to it. Therefore it's definitely not a proxy issue.

It's still possible that it's something like that. Some proxies have trouble with websockets (which we use to connect to the kernel). Some internet security software also interferes with websockets, but that usually affects Windows users, whereas you said you're running Ubuntu.

 

I'm running the Notebook version 5.0 but I also have a bunch of nbextensions running. I think one of them is causing the problem: I disabled all of them and, though I initially need internet to start the notebook, I can still run the notebooks in firefox after turnin off internet.

I'll try to find which extensions does not work offline by disabling them one after the other and I'll report it in case somebody has the same problem.

That's still weird, because it shouldn't require an internet connection at any point. How are you turning off internet when you test this? It does use the special 'loopback' network interface; it may be that you've done something that disables all network interfaces, but I don't think it's likely - I don't even know a command for that.

You could also try upgrading to notebook 5.1. I don't think it's likely to make a difference to that, but you never know.

[Florian Aspart]

You're right this was not the problem. It worked a little bit after disabling internet (unplugging ethernet cable) but stopped working again, probably due to some caching.

This seems to be, indeed, a dns issue: using 127.0.0.1 instead of localhost works fine. Alternatively, disabling IPv6 for the dns in firefox (setting network.dns.disableIPv6 = True in about:config) also fixed the problem for the address localhost.

Thanks again for the help!

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[Thomas Kluyver]

What's in /etc/hosts ? I wonder if it resolves 'localhost' to an IPv6 address and then can't connect to it for some reason.

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[Florian Aspart]

Here is my /etc/hosts:

127.0.0.1    localhost
127.0.1.1    florian

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

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[Thomas Kluyver]

Hmm, that doesn't really support my hypothesis. But maybe Firefox hardcodes something to resolve localhost to an IPv6 address. I'm not sure what the difference is between your computer and mine: I'm also running Firefox on Ubuntu, and I can connect to the notebook on localhost even when I turn the network off.

Thomas

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[Florian Aspart]

I just tried on my laptop (Firefox and Ubuntu) and it work fine too.

I'm not sure which configuration is wrong on my Desktop PC. Anyway I'll just use 127.0.0.1

Thanks again!

Flo

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