nl to ru.nl: No valid RRSIGs made by a key corresponding to a DS RR were found covering the DNSKEY RRset, resulting in no secure entry point (SEP) into the zone. See RFC 4035, Sec. 2.2, RFC 6840, Sec. 5.11. (131.174.78.16, 131.174.78.17, 192.87.106.101, 2001:610:1:800a:192:87:106:101, UDP_-_EDNS0_4096_D_K)
nl to ru.nl: The DS RRset for the zone included algorithm 8 (RSASHA256), but no DS RR matched a DNSKEY with algorithm 8 that signs the zone's DNSKEY RRset. See RFC 4035, Sec. 2.2, RFC 6840, Sec. 5.11. (131.174.78.16, 131.174.78.17, 192.87.106.101, 2001:610:1:800a:192:87:106:101, UDP_-_EDNS0_4096_D_K)
ru.nl/CNAME has errors; select the "Denial of existence" DNSSEC option to see them.
ltnfksp05i.ru.nl/A has errors; select the "Denial of existence" DNSSEC option to see them.
ru.nl/AAAA has errors; select the "Denial of existence" DNSSEC option to see them.
Warnings (3)
ru.nl/CNAME has warnings; select the "Denial of existence" DNSSEC option to see them.
ltnfksp05i.ru.nl/A has warnings; select the "Denial of existence" DNSSEC option to see them.
ru.nl/AAAA has warnings; select the "Denial of existence" DNSSEC option to see them.