Frequent SERVFAIL for mediacdn.vn

As title. It does not always fail. It can resolve the domain if I clear the DNS cache and retry.

This isn’t a Cloudflare issue. The domain doesn’t use Cloudflare. The configured nameservers aren’t resolving for the domain so 1.1.1.1 won’t get an answer either.

mediacdn.vn.		43200	IN	NS	ns8.synerfy.vn.
mediacdn.vn.		43200	IN	NS	ns7.synerfy.vn.
mediacdn.vn.		43200	IN	NS	ns6.synerfy.vn.


dig mediacdn.vn @ns7.synerfy.vn

; <<>> DiG 9.18.24 <<>> mediacdn.vn @ns7.synerfy.vn
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24291
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1024
;; QUESTION SECTION:
;mediacdn.vn.			IN	A

;; AUTHORITY SECTION:
mediacdn.vn.		3600	IN	SOA	ns7.synerfy.vn. hostmaster. 538 900 600 86400 3600

My bad. Try thanhnien.mediacdn.vn then.

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