[dns-operations] ENT NXDOMAIN problem at .BS nameserver ns36.cdns.net

[Stephane Bortzmeyer]

On Tue, Sep 27, 2022 at 02:20:11PM +0000,
 BS Domain Administrator <bsadmin at ub.edu.bs> wrote 
 a message of 229 lines which said:

> Please test again and let us know if the problem still occurs.

This specific problem disappeared but there are other funny things in
the zone. For instance, the three authoritative name servers for .bs
claim that com.bs has three name servers, but they are the same.

% dig @anyns.dns.bs. SOA com.bs      

; <<>> DiG 9.18.1-1ubuntu1.2-Ubuntu <<>> @anyns.dns.bs. SOA com.bs
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32202
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 3, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
; COOKIE: b6dd75980a42dca4e88a412663335275aec889b7585d3e59 (good)
;; QUESTION SECTION:
;com.bs.			IN SOA

;; AUTHORITY SECTION:
COM.bs.			21600 IN NS anyns.dns.bs.
COM.bs.			21600 IN NS ns36.cdns.net.
COM.bs.			21600 IN NS anyns.pch.net.

;; Query time: 16 msec
;; SERVER: 2001:500:14:6068:ad::1#53(anyns.dns.bs.) (UDP)
;; WHEN: Tue Sep 27 21:43:49 CEST 2022
;; MSG SIZE  rcvd: 147