"Error: [Errno 11001] getaddrinfo failed" on Windows

[horeoryang]

Issue Discription
(myvenv) C:\Users\rkfql\djangogirls>python manage.py runserver 0:8000
Performing system checks...

System check identified no issues (0 silenced).
July 14, 2020 - 23:15:38
Django version 2.0.13, using settings 'mysite.settings'
Starting development server at http://0:8000/
Quit the server with CTRL-BREAK.
Error: [Errno 11001] getaddrinfo failed
Operating system : WIndows 10
how to solve this error?

[ekohl]

I don't know a lot about Windows, but have you tried to listen on 0.0.0.0:8000 instead of 0:8000? If you leave that off entirely, does that work?

[magul]

The only place, where I found 0:8000 in our tutorial is here: https://github.com/DjangoGirls/tutorial/blame/master/en/django_start_project/README.md#L184 and it looks, that it was proposed back in 2015: 6e428a4 as a resolution for some unicode problem.

Original commit message doesn't clearly say why we cannot use 0.0.0.0 or even 127.0.0.1.

Did you try 0.0.0.0:8000 or 127.0.0.0:8000 @horeoryang ?

[horeoryang]

Thank you for your reply. i try your solution that is both of you, but it can't work. i will attach the codes.

(myvenv) C:\Users\이시형\djangogirls>python manage.py runserver 0.0.0.0:8000
Performing system checks...

System check identified no issues (0 silenced).
July 18, 2020 - 13:14:28
Django version 2.0.13, using settings 'mysite.settings'
Starting development server at http://0.0.0.0:8000/
Quit the server with CTRL-BREAK.
Exception ignored in thread started by: <function check_errors.<locals>.wrapper at 0x000001B2C490BEE0>
Traceback (most recent call last):
  File "C:\Users\이시형\djangogirls\myvenv\lib\site-packages\django\utils\autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "C:\Users\이시형\djangogirls\myvenv\lib\site-packages\django\core\management\commands\runserver.py", line 141, in inner_run
    run(self.addr, int(self.port), handler,
  File "C:\Users\이시형\djangogirls\myvenv\lib\site-packages\django\core\servers\basehttp.py", line 163, in run
    httpd = httpd_cls(server_address, WSGIRequestHandler, ipv6=ipv6)
  File "C:\Users\이시형\djangogirls\myvenv\lib\site-packages\django\core\servers\basehttp.py", line 66, in __init__
    super().__init__(*args, **kwargs)
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.8_3.8.1264.0_x64__qbz5n2kfra8p0\lib\socketserver.py", line 452, in __init__
    self.server_bind()
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.8_3.8.1264.0_x64__qbz5n2kfra8p0\lib\wsgiref\simple_server.py", line 50, in server_bind
    HTTPServer.server_bind(self)
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.8_3.8.1264.0_x64__qbz5n2kfra8p0\lib\http\server.py", line 140, in server_bind
    self.server_name = socket.getfqdn(host)
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.8_3.8.1264.0_x64__qbz5n2kfra8p0\lib\socket.py", line 756, in getfqdn
    hostname, aliases, ipaddrs = gethostbyaddr(name)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc0 in position 4: invalid start byte



(myvenv) C:\Users\이시형\djangogirls>python manage.py runserver 127.0.0.0:8000
Performing system checks...

System check identified no issues (0 silenced).
July 18, 2020 - 13:09:04
Django version 2.0.13, using settings 'mysite.settings'
Starting development server at http://127.0.0.0:8000/
Quit the server with CTRL-BREAK.
Error: That IP address can't be assigned to.

[ekohl]

It suggests your hostname has unicode in it and Python can't deal with that. https://bugs.python.org/issue26227 is still open. https://stackoverflow.com/questions/25948687/gethostbyaddr-raises-unicodedecodeerror-in-python-3 only has the workaround to rename the system.

[iirbdka]

maybe your computer-name is not english. In my case, my computer name was 용준. and got same situation but after I change my computer name to enlish, It work! Try it.

[SteffPeff]

The IP address is still wrong: 127.0.0.0
it must be 127.0.0.1

[9z8]

you can try
socket.getaddrinfo('localhost', 8080)

[jocekar]

what is gaierror att error in django

[ekohl]

https://stackoverflow.com/questions/15246088/what-does-this-socket-gaierror-mean has a nice explanation. By now it looks like the original bug has been resolved in Python 3.8 and up, but I can't verify that. If anyone is still running into this, please verify that your Python version is new enough.