Both nameservers seem to be down: kp. 172800 IN NS ns1.kptc.kp. kp. 172800 IN NS ns2.kptc.kp. ns1.kptc.kp. 172800 IN A 175.45.176.15 ns2.kptc.kp. 172800 IN A 175.45.176.16 http://dnsviz.net/d/example.kp/dnssec/ Perhaps I should not be surprised, and it is not really an "operational error". -- Viktor.