1637787 - Firefox on mac fails to use DNS local dns

Status: RESOLVED INVALID

(Core :: Networking: DNS, defect)

Description

[matthewwerf]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:76.0) Gecko/20100101 Firefox/76.0

Steps to reproduce:

on OSX 10.15.4:

• install dnsmasq through brew and configure some form of split DNS
• set DNS to 127.0.0.1 in sys pref -> network -> advanced -> DNS
• (validate dnsmasq using dig @127.0.0.1)

Actual results:

• firefox fails to use dns on 127.0.0.1 as configured on the mac

Expected results:

my internal domain should have resolved to my internal IP.
directly entering the IP into firefox functions as expected.
mac DNS cache has also been cleared. mac was also restarted multiple times.

P.S. this works on linux

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 2

[Valentin Gosu [:valentin]]

Hi Matt,

We recently rolled out DNS over HTTPS in the US: https://support.mozilla.org/en-US/kb/firefox-dns-over-https
It sounds like this is what you're experiencing.

Could you check if that's enabled for you?
You can then disable it if you want, and it should start using regular DNS again.

Comment 3

[matthewwerf]

Ahhh that will do it. Thank you.