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Can't get Custom DoH working with CloudFlare families

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C.M.
C.M.
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Hi,

I am running Firefox 75.0 and have tried configuring custom DoH to use recently released CloudFlare families. The Cloudflare community article here https://community.cloudflare.com/t/community-tip-best-practices-for-1-1-1-1-for-families/160496 states that family.cloudflare-dns.com supports DoH.

When using Firefox with the "CloudFlare (default)" DoH configuration I can capture http traffic using Telerik Fiddler to mozilla.cloudflare-dns.com however when I set custom DoH in Firefox to family.cloudflare-dns.com or https://family.cloudflare-dns.com I don't see any http traffic being sent to family.cloudflare-dns.com.

I have found this Mozilla support article https://support.mozilla.org/en-US/questions/1284502 that has a bug raised https://bugzilla.mozilla.org/show_bug.cgi?id=1618042 which appears to be resolved in Firefox 76. I didn't understand the technical detail of the bug raised and I'm not sure if I am raising the same issue.

Hi, I am running Firefox 75.0 and have tried configuring custom DoH to use recently released CloudFlare families. The Cloudflare community article here https://community.cloudflare.com/t/community-tip-best-practices-for-1-1-1-1-for-families/160496 states that family.cloudflare-dns.com supports DoH. When using Firefox with the "CloudFlare (default)" DoH configuration I can capture http traffic using Telerik Fiddler to mozilla.cloudflare-dns.com however when I set custom DoH in Firefox to family.cloudflare-dns.com or https://family.cloudflare-dns.com I don't see any http traffic being sent to family.cloudflare-dns.com. I have found this Mozilla support article https://support.mozilla.org/en-US/questions/1284502 that has a bug raised https://bugzilla.mozilla.org/show_bug.cgi?id=1618042 which appears to be resolved in Firefox 76. I didn't understand the technical detail of the bug raised and I'm not sure if I am raising the same issue.