This is failing for me regularly:

$ dig ns3.gpo.gov +dnssec +norecurse @162.140.15.200
;; communications error to 162.140.15.200#53: timed out
;; communications error to 162.140.15.200#53: timed out
;; communications error to 162.140.15.200#53: timed out

; <<>> DiG 9.18.11 <<>> ns3.gpo.gov +dnssec +norecurse @162.140.15.200
;; global options: +cmd
;; no servers could be reached

but all other combos of ns3.gpo.gov or ns4.gpo.gov and 162.140.15.100
and 162.140.15.200 work fine.

On Tue, Mar 14, 2023 at 12:03 PM Tim Maestas <tmaesta...@gmail.com> wrote:
>
> I've been having problems resolving www.federalregister.gov which is served 
> by ns3.gpo.gov and ns4.gpo.gov, using BIND 9.16.27.  Haven't been able to 
> quite figure out why so I've stuck an NTA in for the time being.
>
> On Tue, Mar 14, 2023 at 8:52 AM Stephane Bortzmeyer <bortzme...@nic.fr> wrote:
>>
>> On Tue, Mar 14, 2023 at 11:35:38AM -0400,
>>  Alexandra Yang <draya...@gmail.com> wrote
>>  a message of 183 lines which said:
>>
>> > I wonder if any of your nameserver resolve it just fine, like 8.8.8.8
>> > works
>>
>> Among RIPE Atlas probes, most succeed:
>>
>> % blaeu-resolve --displayvalidation -r 100  --type A gpo.gov
>> [ (Authentic Data flag)  162.140.14.82] : 46 occurrences
>> [162.140.14.82] : 52 occurrences
>> [ERROR: SERVFAIL] : 2 occurrences
>> Test #50935448 done at 2023-03-14T15:46:50Z
>>
>> The two whose resolvers servfail may have stricter/paranoid resolvers.
>>
>>
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