Re: DNS Error - Record Not Found

[Viktor Dukhovni]

As seen via DNSViz.net, the blackboard.com domain appears to be currently broken: https://dnsviz.net/d/blackboard.com/ZE7VMQ/dnssec/

It is DNSSEC-signed, but not returning any DNSKEY records.  When queried directly:

```
$ dig +nocmd +norecur +dnssec -t dnskey blackboard.com @ns2.blackboard.com
;; Truncated, retrying in TCP mode.
;; Connection to 3.227.199.150#53(3.227.199.150) for blackboard.com failed: timed out.
;; Connection to 3.227.199.150#53(3.227.199.150) for blackboard.com failed: timed out.
;; communications error to 3.227.199.150#53: connection reset

$ dig +nocmd +norecur +dnssec -t dnskey blackboard.com @ns1.blackboard.com
;; connection timed out; no servers could be reached

```

On Saturday, 29 April 2023 at 9:23:07 pm UTC-4 Aaron Vorhis wrote:

Only on Google 8.8.8.8 and 8.8.4.4 the A record for any of our hosts. Our primary domain callutheran.edu resolves as well as all of our other hosts except for bblearn.callutheran.edu (A record callutheran.blackboard.com)