Jupyterhub Failed to Bind Issue

[Ethan Suh]

I am on a university virtual machine of Ubuntu 14.04 where I did a clean install of Jupyterhub. I am still working with 3.2.1, not 4.0. I am receiving this error message that I can't seem to understand:

[E 2015-08-17 10:08:12.623 JupyterHub app:1029] Failed to bind hub to http://localhost:8081/hub/

[E 2015-08-17 10:08:12.624 JupyterHub app:1097]

   Traceback (most recent call last):

     File "/opt/anaconda3/lib/python3.4/site-packages/jupyterhub/app.py", line 1095, in launch_instance_async

       yield self.start()

     File "/opt/anaconda3/lib/python3.4/site-packages/jupyterhub/app.py", line 1027, in start

       self.http_server.listen(self.hub_port, address=self.hub_ip)

     File "/opt/anaconda3/lib/python3.4/site-packages/tornado/tcpserver.py", line 126, in listen

       sockets = bind_sockets(port, address=address)

     File "/opt/anaconda3/lib/python3.4/site-packages/tornado/netutil.py", line 187, in bind_sockets

       sock.bind(sockaddr)

   OSError: [Errno 99] Cannot assign requested address

I initially thought it was a firewall issue, but that does not seem to be the case. Any ideas on what I should do?

Thanks for the help.

[Matthias Bussonnier]

On Aug 17, 2015, at 17:17, Ethan Suh <ds...@nd.edu> wrote:

I am on a university virtual machine of Ubuntu 14.04 where I did a clean install of Jupyterhub. I am still working with 3.2.1, not 4.0. I am receiving this error message that I can't seem to understand:

Can you find anything else to 8081 ?

eg: Python3 -m http.server 8081

-- 

M

[E 2015-08-17 10:08:12.623 JupyterHub app:1029] Failed to bind hub to http://localhost:8081/hub/

[E 2015-08-17 10:08:12.624 JupyterHub app:1097]

   Traceback (most recent call last):

     File "/opt/anaconda3/lib/python3.4/site-packages/jupyterhub/app.py", line 1095, in launch_instance_async

       yield self.start()

     File "/opt/anaconda3/lib/python3.4/site-packages/jupyterhub/app.py", line 1027, in start

       self.http_server.listen(self.hub_port, address=self.hub_ip)

     File "/opt/anaconda3/lib/python3.4/site-packages/tornado/tcpserver.py", line 126, in listen

       sockets = bind_sockets(port, address=address)

     File "/opt/anaconda3/lib/python3.4/site-packages/tornado/netutil.py", line 187, in bind_sockets

       sock.bind(sockaddr)

   OSError: [Errno 99] Cannot assign requested address

I initially thought it was a firewall issue, but that does not seem to be the case. Any ideas on what I should do?

Thanks for the help.

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[Ethan Suh]

Yes, http.server does run on 8081.

[Ognyan Moore]

Just came across this post through a google search, I have the same issue running on a ubuntu server 15.04 VM.

Running:

$python3 -m http.service 8888

ogi@ubuntu:/usr/lib/systemd/system$ python3 -m http.server 8888

Serving HTTP on 0.0.0.0 port 8888 ...

[Ethan Suh]

I had been working on this issue with one of my administrators and he found that IPv6 was disabled on the machine I was on. We tried reinstalling everything after enabling IPv6 and that has fixed the issue for us. It's interesting jupyterhub itself doesn't seem to be using IPv6 but perhaps something during the install does. 

Hope that gets your issue fixed as well. 

[MinRK]

Can anyone experiencing this issue bind to localhost with a regular socket?

import socket
s = socket.socket()
s.bind(('localhost', 8888))

​

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[redward]

I experienced this issue and was able to bind to a port using the code below.

Running Jupyter with: --ip="*" or --ip="127.0.0.0" solved the issue without installing ipv6

[邱承]

If you can bind to 127.0.0.1, the problem is in your hosts file.

[Nicholaus Halecky]

I'm joining this thread a little late, but am hitting the same error and am unable to resolve using the solutions mentioned here. Here the traceback:

```python

root@bombora-analytics-m:~# jupyterhub --port=8124 --ip="127.0.0.1"

[I 2016-02-22 17:08:21.790 JupyterHub app:523] Loading cookie_secret from /root/jupyterhub_cookie_secret

[W 2016-02-22 17:08:21.814 JupyterHub app:258]

    Generating CONFIGPROXY_AUTH_TOKEN. Restarting the Hub will require restarting the proxy.

    Set CONFIGPROXY_AUTH_TOKEN env or JupyterHub.proxy_auth_token config to avoid this message.

[W 2016-02-22 17:08:21.823 JupyterHub app:642] No admin users, admin interface will be unavailable.

[W 2016-02-22 17:08:21.823 JupyterHub app:643] Add any administrative users to `c.Authenticator.admin_users` in config.

[I 2016-02-22 17:08:21.824 JupyterHub app:669] Not using whitelist. Any authenticated user will be allowed.

E 2016-02-22 17:37:17.279 JupyterHub app:1049] Failed to bind hub to http://localhost:8081/hub/

[E 2016-02-22 17:37:17.280 JupyterHub app:1117]

    Traceback (most recent call last):

      File "/usr/local/bin/miniconda/lib/python3.5/site-packages/jupyterhub/app.py", line 1115, in launch_instance_async

        yield self.start()

      File "/usr/local/bin/miniconda/lib/python3.5/site-packages/jupyterhub/app.py", line 1047, in start

        self.http_server.listen(self.hub_port, address=self.hub_ip)

      File "/usr/local/bin/miniconda/lib/python3.5/site-packages/tornado/tcpserver.py", line 126, in listen

        sockets = bind_sockets(port, address=address)

      File "/usr/local/bin/miniconda/lib/python3.5/site-packages/tornado/netutil.py", line 196, in bind_sockets

        sock.bind(sockaddr)

    OSError: [Errno 99] Cannot assign requested address

```

Any additional thoughts as to what next steps I can take? Thank you. :)

[MinRK]

What version of JupyterHub (jupyterhub --version)?

The cause for this seems to be a host configuration that tells your machine that localhost is an ipv6 address, but ipv6 is not actually available (i.e. an internally inconsistent configuration of the system). You can specify

c.JupyterHub.hub_ip = '127.0.0.1'

to tell the hub to listen on 127 instead. (--ip specifies the public IP of the whole application, not the internal IP of the Hub service)

-MinRK

​

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