I try to add a private DNS on my FP3 (e/os) 1.10 and it’s not working on few url.
For instance ns0.fdn.fr is not working but 1dot1dot1dot1.cloudflare-dns.com is working …
I tested ns0.fdn.fr on my wife smartphone it’s working …
Have you any idea why this not working ? maybe the root certificates list ? this open dns is using Let’s Encrypt …
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try the second one -
ns1.fdn.fr … that one worked for me in a v1.10-q when ns0.fdn.fr didn’t.
Androids dns-over-tls implementation sends out a probing query to gstatic.com to verify DoT works (https://gitlab.e.foundation/e/backlog/-/issues/6125).
That probing dns query doesn’t complete with ns0.fdn.fr, when it does on ns1. Certificate chain, pubkey algos etc, they all look identical. Outside of Android I’d have no issue doing the probing querys to ns0 on tls port 853