DNS over HTTPS fails when network.trr.mode is 3

[kerft]

I heard that DNS over HTTPS will soon be the default for many. In version Firefox 69 I tried it, checking the box under general, networking. On https://www.cloudflare.com/ssl/encrypted-sni/ it works but warns you do not have DNSSEC, and suggests you change the default for network.trr.mode from 2 to 3 which means force DNS over HTTPS with no fallback. When I set network.trr.mode to 3, no web pages load. I increased network.trr.request-timeout but that did not work.

Is there already a bugzilla report filed?

[Brummelchen]

which DoH server is set?
firefox 70 - trr mode on 3 means anything = dead, no connection. (default settings)
trr default is 0 here. at least i wont chose CF. there are better.

[kerft]

This is with "Cloudflare (default)" as the provider from the list in general, network settings, settings. https://blog.mozilla.org/futurereleases ... e-default/ this says in late September a small percent of US users will have DoH enabled as a test.