How can I make the DNS respond with DNS_PROBE_POSSIBLE if there's no existing DNS?

So with and many other domains, if you request a subdomain that doesn’t exist, Cloudflare immediately sends DNS_PROBE_POSSIBLE. For some reason, on my domain it doesn’t do that? It just waits for 10 seconds then redirects me to some other page.

I’m using Fastly right now. I’m using using a single CNAME record that points to Fastly and a TXT record. How can I achieve the behavior that doesn’t send back a response if the record doesn’t exist?

That sure sounds like there’s some sort of matching DNS record. If you want more specific information, please post the non-existant full subdomain name.

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