socket.getfqdn() returns domain "mshome.net"

[markuskramerIgitt]

BPO	36382
Nosy	@pfmoore, @tjguk, @zware, @zooba, @markuskramerIgitt

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-03-20.15:21:41.437>
created_at = <Date 2019-03-20.13:40:49.967>
labels = ['type-bug', '3.7', 'OS-windows']
title = 'socket.getfqdn() returns domain "mshome.net"'
updated_at = <Date 2019-03-20.15:53:09.898>
user = 'https://github.com/markuskramerIgitt'

bugs.python.org fields:

activity = <Date 2019-03-20.15:53:09.898>
actor = 'markuskramerIgitt'
assignee = 'none'
closed = True
closed_date = <Date 2019-03-20.15:21:41.437>
closer = 'markuskramerIgitt'
components = ['Windows']
creation = <Date 2019-03-20.13:40:49.967>
creator = 'markuskramerIgitt'
dependencies = []
files = []
hgrepos = []
issue_num = 36382
keywords = []
message_count = 4.0
messages = ['338472', '338478', '338482', '338487']
nosy_count = 5.0
nosy_names = ['paul.moore', 'tim.golden', 'zach.ware', 'steve.dower', 'markuskramerIgitt']
pr_nums = []
priority = 'normal'
resolution = 'works for me'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36382'
versions = ['Python 2.7', 'Python 3.7']

[markuskramerIgitt]

In a corporate network, wmic computersystem get domain returns the correct domain.

On some clients, the Python query "socket.getfqdn()" returns the wrong domain, namely "mshome.net"

>>> import socket
>>> socket.getfqdn()
'*****.mshome.net'

I have only found only very old nominations of that domain.

Problems persists after reboot.

Tried versions
Python 2.7.15 (v2.7.15:ca079a3ea3, Apr 30 2018, 16:30:26) [MSC v.1500 64 bit (AMD64)] on win32
Python 3.7.2 (tags/v3.7.2:9a3ffc0492, Dec 23 2018, 22:20:52) [MSC v.1916 32 bit (Intel)] on win32

Currently, I suspect this is a DHCP configuration problem.

[zooba]

We just return the result of GetComputerNameEx 1 here - we don't use WMI at all (and given the complexities, we are not going to start).

Are you able to provide any more information? In particular, if the documentation for GetComputerNameEx (below) helps you understand why these machines are different, that would be helpful to know.

Obviously (I hope) we can't diagnose a DHCP issue on your network, so claiming this is a bug in Python is likely premature.

[markuskramerIgitt]

Dear Steve,
in fact not a Python bug at all.

I used 2 commands:
ipconfig /release
ipconfig /renew
and rebootet.

This fixed the issue, for now.

Also, I found this domain in c:\Windows\System32\drivers\etc\hosts.ics

Unclear who created that entry.

Documenting this here could help others with the same problem.

Closing this issue.

[markuskramerIgitt]

I found the IP of mshome.net in an Ethernet adapter "vEthernet"
It seems that this adapter stems from Hyper-V.

It therefore seems that socket.getfqdn() reported the wrong network adapter once.

Because I cannot reproduce this, I leave this issue closed.