Notebook crashed if unplugged ethernet cable

[Carreau]

Reported by a friend yesterday,

Apparently reproductible in fedora. I don't think we can do much, but for the record I'll open the issue with the traceback.

To reproduce

Start a server on localhost
Unplug cable without deactivating interfaces first
Try to start a second server, it crashes a launch time :

(tornado 2.4.1)

[NotebookApp] Using existing profile dir: u'/home/parleur/.config/ipython/profile_default'
[NotebookApp] Serving notebooks from /home/parleur
Traceback (most recent call last):
 File "/home/parleur/.local/bin/ipython", line 9, in <module>
   load_entry_point('ipython==0.13.1', 'console_scripts', 'ipython')()
 File "/home/parleur/.local/lib/python2.7/site-packages/IPython/frontend/terminal/ipapp.py", line 388, in launch_new_instance
   app.initialize()
 File "<string>", line 2, in initialize
 File "/home/parleur/.local/lib/python2.7/site-packages/IPython/config/application.py", line 84, in catch_config_error
   return method(app, *args, **kwargs)
 File "/home/parleur/.local/lib/python2.7/site-packages/IPython/frontend/terminal/ipapp.py", line 313, in initialize
   super(TerminalIPythonApp, self).initialize(argv)
 File "<string>", line 2, in initialize
 File "/home/parleur/.local/lib/python2.7/site-packages/IPython/config/application.py", line 84, in catch_config_error
   return method(app, *args, **kwargs)
 File "/home/parleur/.local/lib/python2.7/site-packages/IPython/core/application.py", line 325, in initialize
   self.parse_command_line(argv)
 File "/home/parleur/.local/lib/python2.7/site-packages/IPython/frontend/terminal/ipapp.py", line 308, in parse_command_line
   return super(TerminalIPythonApp, self).parse_command_line(argv)
 File "<string>", line 2, in parse_command_line
 File "/home/parleur/.local/lib/python2.7/site-packages/IPython/config/application.py", line 84, in catch_config_error
   return method(app, *args, **kwargs)
 File "/home/parleur/.local/lib/python2.7/site-packages/IPython/config/application.py", line 420, in parse_command_line
   return self.initialize_subcommand(subc, subargv)
 File "<string>", line 2, in initialize_subcommand
 File "/home/parleur/.local/lib/python2.7/site-packages/IPython/config/application.py", line 84, in catch_config_error
   return method(app, *args, **kwargs)
 File "/home/parleur/.local/lib/python2.7/site-packages/IPython/config/application.py", line 359, in initialize_subcommand
   self.subapp.initialize(argv)
 File "<string>", line 2, in initialize
 File "/home/parleur/.local/lib/python2.7/site-packages/IPython/config/application.py", line 84, in catch_config_error
   return method(app, *args, **kwargs)
 File "/home/parleur/.local/lib/python2.7/site-packages/IPython/frontend/html/notebook/notebookapp.py", line 532, in initialize
   self.init_webapp()
 File "/home/parleur/.local/lib/python2.7/site-packages/IPython/frontend/html/notebook/notebookapp.py", line 450, in init_webapp
   self.http_server.listen(port, self.ip)
 File "/home/parleur/.local/lib/python2.7/site-packages/tornado/netutil.py", line 120, in listen
   sockets = bind_sockets(port, address=address)
 File "/home/parleur/.local/lib/python2.7/site-packages/tornado/netutil.py", line 268, in bind_sockets
   0, flags)):
gaierror: [Errno -9] Address family for hostname not supported

[juliantaylor]

its a tornado issue, see tornadoweb/tornado#593
and #3045

[minrk]

closing as duplicate of #3045, and maybe we should close #3045 as well, since this isn't an IPython issue.