Subtchallenge.com not resolving

DNS & Network 1.1.1.1
#1

Here is the link to my setup: https://cloudflare-dns.com/help/#eyJpc0NmIjoiWWVzIiwiaXNEb3QiOiJObyIsImlzRG9oIjoiWWVzIiwicmVzb2x2ZXJJcC0xLjEuMS4xIjoiWWVzIiwicmVzb2x2ZXJJcC0xLjAuMC4xIjoiWWVzIiwicmVzb2x2ZXJJcC0yNjA2OjQ3MDA6NDcwMDo6MTExMSI6Ik5vIiwicmVzb2x2ZXJJcC0yNjA2OjQ3MDA6NDcwMDo6MTAwMSI6Ik5vIiwiZGF0YWNlbnRlckxvY2F0aW9uIjoiUFJHIiwiaXNXYXJwIjoiTm8iLCJpc3BOYW1lIjoiQ2xvdWRmbGFyZSIsImlzcEFzbiI6IjEzMzM1In0=

Google’s 8.8.8.8 resolves ok while 1.1.1.1 and 1.0.0.1 do not.

#2

I had to switch to 8.8.8.8 since it keeps not resolving.

dig +short CHAOS TXT id.server @1.0.0.1 or @1.1.1.1 reports PRG

$ dig @1.1.1.1 subtchallenge.com

; <<>> DiG 9.11.3-1ubuntu1.13-Ubuntu <<>> @1.1.1.1 subtchallenge.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 50503
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; OPT=15: 00 06 ("..")
;; QUESTION SECTION:
;subtchallenge.com.		IN	A

;; Query time: 784 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Mon Oct 26 13:22:05 CET 2020
;; MSG SIZE  rcvd: 52

$ dig @1.0.0.1 subtchallenge.com

; <<>> DiG 9.11.3-1ubuntu1.13-Ubuntu <<>> @1.0.0.1 subtchallenge.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 5242
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; OPT=15: 00 06 ("..")
;; QUESTION SECTION:
;subtchallenge.com.		IN	A

;; Query time: 681 msec
;; SERVER: 1.0.0.1#53(1.0.0.1)
;; WHEN: Mon Oct 26 13:22:41 CET 2020
;; MSG SIZE  rcvd: 52

$ dig @8.8.8.8 subtchallenge.com

; <<>> DiG 9.11.3-1ubuntu1.13-Ubuntu <<>> @8.8.8.8 subtchallenge.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9876
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;subtchallenge.com.		IN	A

;; ANSWER SECTION:
subtchallenge.com.	21599	IN	A	192.5.18.235

;; Query time: 317 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Oct 26 13:23:05 CET 2020
;; MSG SIZE  rcvd: 62

$ dig @8.8.4.4 subtchallenge.com

; <<>> DiG 9.11.3-1ubuntu1.13-Ubuntu <<>> @8.8.4.4 subtchallenge.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27784
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;subtchallenge.com.		IN	A

;; ANSWER SECTION:
subtchallenge.com.	21575	IN	A	192.5.18.235

;; Query time: 23 msec
;; SERVER: 8.8.4.4#53(8.8.4.4)
;; WHEN: Mon Oct 26 13:23:29 CET 2020
;; MSG SIZE  rcvd: 62

$ dig @ns3.Cloudflare.com whoami.Cloudflare.com 123 txt +short
reports nothing (no output).
#3

The problem persists. Should I supply some other information in order to help debugging?

#4

Hi @zbynek.winkler,

Thanks for the report, I can reproduce. It seems an issue between our colo and upstream auth servers. We’ll try to figure it out.

#5

It is resolving now.

#6

@anb It seems that community.subtchallenge.com subdomain exhibits the same problem as its parent domain used to exhibit:

$ dig @1.1.1.1 community.subtchallenge.com

; <<>> DiG 9.11.3-1ubuntu1.13-Ubuntu <<>> @1.1.1.1 community.subtchallenge.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 65495
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; OPT=15: 00 06 ("..")
;; QUESTION SECTION:
;community.subtchallenge.com.	IN	A

;; Query time: 1031 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Thu Dec 17 08:38:59 CET 2020
;; MSG SIZE  rcvd: 62

while

$ dig @8.8.8.8 community.subtchallenge.com

; <<>> DiG 9.11.3-1ubuntu1.13-Ubuntu <<>> @8.8.8.8 community.subtchallenge.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39230
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;community.subtchallenge.com.	IN	A

;; ANSWER SECTION:
community.subtchallenge.com. 21599 IN	A	192.5.18.235

;; Query time: 645 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Dec 17 08:38:51 CET 2020
;; MSG SIZE  rcvd: 72
#7

Hi, sorry about that. I added another workaround. It should be working now.

#8