Important Notice: We're experiencing email notification issues. If you've posted a question in the community forums recently, please check your profile manually for responses while we're working to fix this.

On Monday the 3rd of March, around 5pm UTC (9am PT) users may experience a brief period of downtime while one of our underlying services is under maintenance.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

dns over https configuration issue

user226514887665625432230708206477982186438
user226514887665625432230708206477982186438
more options

If I place in the /general/network settings/ -Enable DNS over https the value of "https://mozilla.cloudflare-dns.com/dns-query" and place a fake DNS server IP on my workstations DNS such as 100.100.100.100 (not a DNS server) as apposed to 8.8.8.8 should Firefox be able to resolve network sites?

I had this configuration initially and it worked then stopped today Nov-26-2018. See below configuration from firefox and cloudflares "https://cloudflare-dns.com/help/" test.

If I place in the /general/network settings/ -Enable DNS over https the value of "https://mozilla.cloudflare-dns.com/dns-query" and place a fake DNS server IP on my workstations DNS such as 100.100.100.100 (not a DNS server) as apposed to 8.8.8.8 should Firefox be able to resolve network sites? I had this configuration initially and it worked then stopped today Nov-26-2018. See below configuration from firefox and cloudflares "https://cloudflare-dns.com/help/" test.
Attached screenshots

Chosen solution

I have found a solution. DNS over https ddoes not rely on the workstations local DNS as long as network.trr.mode is set to a value of 3. If network.trr.mode is set to 2 you cannot tell as it will fal back to your hosts DNS if a resolution failure occurs

Read this answer in context 👍 0

All Replies (2)

user226514887665625432230708206477982186438
user226514887665625432230708206477982186438 Question owner
more options

mace2 said

If I place in the /general/network settings/ -Enable DNS over https the value of "https://mozilla.cloudflare-dns.com/dns-query" and place a fake DNS server IP on my workstations DNS such as 100.100.100.100 (not a DNS server) as apposed to 8.8.8.8 should Firefox be able to resolve network sites? I had this configuration initially and it worked then stopped today Nov-26-2018. See below configuration from firefox and cloudflares "https://cloudflare-dns.com/help/" test.

I have noticed that firefox 63.03 will no long resolve requests immediately after a clear history of all components is performed. Is this a known bug?

user226514887665625432230708206477982186438
user226514887665625432230708206477982186438 Question owner
more options

Chosen Solution

I have found a solution. DNS over https ddoes not rely on the workstations local DNS as long as network.trr.mode is set to a value of 3. If network.trr.mode is set to 2 you cannot tell as it will fal back to your hosts DNS if a resolution failure occurs