#37022: manage.py runserver fails with "nodename nor servname provided" when run
using an rfc6761 hostname
-------------------------------+-----------------------------------------
Reporter: Chris Rose | Type: Uncategorized
Status: new | Component: Utilities
Version: 5.2 | Severity: Normal
Keywords: dns runserver | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------+-----------------------------------------
{{{
$ uv run manage.py runserver nomnom.dev.localhost:8441
Watching for file changes with StatReloader
2026-04-03T15:53:16.440737Z [info ] Watching for file changes with
StatReloader [django.utils.autoreload]
Performing system checks...
System check identified no issues (0 silenced).
Error: [Errno 8] nodename nor servname provided, or not known
}}}
`nomnom.dev.localhost` doesn't directly resolve in DNS, but it is a valid
RFC 6761 special use domain.
I've attached my settings, and because ALLOWED_HOSTS is relevant, here's
that value from manage.py shell:
{{{
uv run manage.py shell
45 objects imported automatically (use -v 2 for details).
Python 3.13.12 (main, Feb 3 2026, 17:53:27) [Clang 17.0.0
(clang-1700.6.3.2)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from django.conf import settings
>>> settings.ALLOWED_HOSTS
['nomnom.dev.localhost']
>>>
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/37022>
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