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 On 28 September 2017 at 10:06, Florian Aspart <[email protected]> wrote: > 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 > > > 2017-09-27 15:34 GMT+02:00 Thomas Kluyver <[email protected]>: > >> 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. >> >> On 27 September 2017 at 14:22, Florian Aspart <[email protected]> >> wrote: >> >>> 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! >>> >>> 2017-09-27 12:27 GMT+02:00 Thomas Kluyver <[email protected]>: >>> >>>> On 27 September 2017 at 09:54, Florian Aspart <[email protected] >>>> > 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 >>>>> <https://github.com/ipython-contrib/jupyter_contrib_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. 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