DNS does not propagate

The screenshot illustrate the case for “DNS only”. But the issue remains when switching the “Proxy status” to “Proxied”.

Issue: After adding these A records for the domain airport.cloudns.org and ready.airport.cloudns.org, some but only a few DNS servers across the world are able to update and reflect such changes. Most of the servers fail to update the added A records. Moreover, those servers that work initially would eventually revert back to the incorrect state after a while.

However the NS records seem to work.

My SSL/TLS encryption mode is Flexible.

Any help would be greatly appreciated.

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The parent nameservers are set up incorrectly and claim SOA despite the subdomain airport being delegated.

You need to fix the incorrect response of the parent nameservers.

dig +trace +nodnssec airport.cloudns.org

cloudns.org.            3600    IN      NS      ns3.cloudns.net.
cloudns.org.            3600    IN      NS      ns2.cloudns.net.
cloudns.org.            3600    IN      NS      ns4.cloudns.net.
cloudns.org.            3600    IN      NS      ns1.cloudns.net.
;; Received 131 bytes from 2001:500:e::1#53(a0.org.afilias-nst.info) in 28 ms

airport.cloudns.org.    3600    IN      SOA     ns1.cloudns.net. support.cloudns.net. 2023122309 7200 1800 1209600 3600
;; Received 135 bytes from 2a01:4ff:f0:94da::1#53(ns2.cloudns.net) in 108 ms

Querying directly for NS records however is working:

dig +trace +nodnssec airport.cloudns.org ns

cloudns.org.            3600    IN      NS      ns4.cloudns.net.
cloudns.org.            3600    IN      NS      ns3.cloudns.net.
cloudns.org.            3600    IN      NS      ns1.cloudns.net.
cloudns.org.            3600    IN      NS      ns2.cloudns.net.
;; Received 131 bytes from 199.19.57.1#53(d0.org.afilias-nst.org) in 28 ms

airport.cloudns.org.    3600    IN      NS      rose.ns.cloudflare.com.
airport.cloudns.org.    3600    IN      NS      duke.ns.cloudflare.com.
;; Received 131 bytes from 5.161.86.199#53(ns2.cloudns.net) in 3348 ms

You should only ever use Full (strict).

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