id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
37022	"manage.py runserver fails with ""nodename nor servname provided"" when run using an rfc6761 hostname"	Chris Rose		"{{{
$ 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']
>>>
}}}"	Uncategorized	new	Utilities	5.2	Normal		dns runserver	Chris Rose	Unreviewed	0	0	0	0	0	0