Socket Error 99 for ipython notebook

[gluincth]

Hi
when trying to open a notebook I get a socket error 99 "Cannot assign requested address". This happened after a system update, although Ipython was updated only from 2.1.0-62 to 2.1.0-63 (SuSE package) I checked the following without any sucess:

1. checked if loopback device is running (it is with inet addr:127.0.0.1 Mask:255.0.0.0)
2. checked with netstat -lp if standard port is already assigned (it was not)
3. run a small test script to start tornado web server at port 8888, it worked
4. Create a default profile and run ipython again
5. Started ipython with explicit host and (random) port (ipython notebook --init --ip='localhost' --port=49151)
6. Tried is as root
7. Checked that the firewall is not blocking
8. Checked that I am able to write to tmp (in case that is needed)

So I am at a loss what else I can do. Any pointer on what else I can do are appreciated.

The start-up message is
tmp/> ipython notebook --init --log-level=50 --ip='localhost' --port=49151 [15:46:39]
Traceback (most recent call last):
File "/usr/bin/ipython", line 5, in
start_ipython()
File "/usr/lib/python2.7/site-packages/IPython/init.py", line 120, in start_ipython
return launch_new_instance(argv=argv, *_kwargs)
File "/usr/lib/python2.7/site-packages/IPython/config/application.py", line 563, in launch_instance
app.initialize(argv)
File "", line 2, in initialize
File "/usr/lib/python2.7/site-packages/IPython/config/application.py", line 92, in catch_config_error
return method(app, *args, *_kwargs)
File "/usr/lib/python2.7/site-packages/IPython/terminal/ipapp.py", line 320, in initialize
super(TerminalIPythonApp, self).initialize(argv)
File "", line 2, in initialize
File "/usr/lib/python2.7/site-packages/IPython/config/application.py", line 92, in catch_config_error
return method(app, _args, *_kwargs)
File "/usr/lib/python2.7/site-packages/IPython/core/application.py", line 381, in initialize
self.parse_command_line(argv)
File "/usr/lib/python2.7/site-packages/IPython/terminal/ipapp.py", line 315, in parse_command_line
return super(TerminalIPythonApp, self).parse_command_line(argv)
File "", line 2, in parse_command_line
File "/usr/lib/python2.7/site-packages/IPython/config/application.py", line 92, in catch_config_error
return method(app, _args, *_kwargs)
File "/usr/lib/python2.7/site-packages/IPython/config/application.py", line 475, in parse_command_line
return self.initialize_subcommand(subc, subargv)
File "", line 2, in initialize_subcommand
File "/usr/lib/python2.7/site-packages/IPython/config/application.py", line 92, in catch_config_error
return method(app, _args, *_kwargs)
File "/usr/lib/python2.7/site-packages/IPython/config/application.py", line 413, in initialize_subcommand
self.subapp.initialize(argv)
File "", line 2, in initialize
File "/usr/lib/python2.7/site-packages/IPython/config/application.py", line 92, in catch_config_error
return method(app, _args, *_kwargs)
File "/usr/lib/python2.7/site-packages/IPython/html/notebookapp.py", line 745, in initialize
self.init_webapp()
File "/usr/lib/python2.7/site-packages/IPython/html/notebookapp.py", line 632, in init_webapp
self.http_server.listen(port, self.ip)
File "/usr/lib64/python2.7/site-packages/tornado/tcpserver.py", line 116, in listen
sockets = bind_sockets(port, address=address)
File "/usr/lib64/python2.7/site-packages/tornado/netutil.py", line 103, in bind_sockets
sock.bind(sockaddr)
File "/usr/lib64/python2.7/socket.py", line 224, in meth
return getattr(self._sock,name)(*args)
error: [Errno 99] Cannot assign requested address

My system configuration is
{'commit_hash': '681fd77',
'commit_source': 'installation',
'default_encoding': 'UTF-8',
'ipython_path': '/usr/lib/python2.7/site-packages/IPython',
'ipython_version': '2.1.0',
'os_name': 'posix',
'platform': 'Linux-3.11.10-17-default-x86_64-with-SuSE-13.1-x86_64',
'sys_executable': '/usr/bin/python',
'sys_platform': 'linux2',
'sys_version': '2.7.6 (default, Nov 21 2013, 15:55:38) [GCC]'}

My tornado version is
Name: python-tornado/Version: 3.2.1-2.1/Arch: x86_64

[minrk]

And what if you try --ip=127.0.0.1?

[gluincth]

Hi

That works (should have thought of that). I put it into my ipython_notebook_config.py. I wonder though why the behaviour changed...
So from my side I could close this issue. Only if one could change the error message to something meaningful that points to the solution, I would keep this issue open. But maybe this problem is too specific...

Thanks a lot for the quick answer!

[minrk]

Copying explanation from #6191:

IPython listens on localhost by default. 127.0.0.1 ought to behave the same, and does in almost all cases. Some cases where this can be handled differently include local proxies and/or firewalls (usually due to a configuration oversight, rather than an intentional difference in behavior). We have found cases where localhost works and 127 doesn't and vice versa, so there isn't an unambiguously correct answer for the default.

Do you have a firewall and/or proxy configuration? If so, do you control its configuration? I would describe this behavior as a bug in your network setup, but it may not be one that you have permission to fix.

[naoko]

Thank you, specifying 127.0.0.1 solved the socket error for me as well

[tigerneil]

If you use it in cloud server, you can use --ip=0.0.0.0.

[Leegenux]

Thanks for keeping this issue on, I am setting up a notebook server on a cloud server. And specifying the listening ip as "0.0.0.0" does solved this same problem.

[OussamaSegh]

Thanks, I had the same problem :)

[GeeCastro]

thanks it solved it !