Homebrewed client gets "No TXT record found"

“During secondary validation” may mean a few things:

  • Your NSes have a geographic filter.
  • Your NSes are not synced properly. When primary validator hits a NS that has proper records and secondary(es) hit the one(s) that do not.

More info here:

Additionally, when I do this query dig _acme-challenge.sor0.ru, I get a different response from yours:

_acme-challenge.sor0.ru. 90     IN      CNAME   sor0.ru.
sor0.ru.                3600    IN      A       95.143.188.120

;; AUTHORITY SECTION:
sor0.ru.                345600  IN      NS      ns1.sor0.ru.
sor0.ru.                345600  IN      NS      ns1.axelname.RU.
sor0.ru.                345600  IN      NS      ns2.axelname.RU.

When I query your NS directly from NL, I get connection refused:

$ dig _acme-challenge.sor0.ru @ns1.sor0.ru.
;; communications error to 95.143.188.120#53: connection refused
;; communications error to 95.143.188.120#53: connection refused
;; communications error to 95.143.188.120#53: connection refused
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