Hi colleagues, we are using knot-resolver as anycast resolvers for our region wide network. Everything works fine, but from saturday we are experiencing problems with zone .cz on one of our resolvers: lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [plan  ][00000.00] plan 'www.seznam.cz.' type 'AAAA' uid [20220.00] lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [iterat][20220.00]   'www.seznam.cz.' type 'AAAA' new uid was assigned .01, parent uid .00 lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.01]   => skipping exact RR: rank 060 (min. 030), new TTL -16225 lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.01]   => trying zone: seznam.cz., NSEC3, hash db928b48 lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.01]   => NSEC3 depth 1: hash 0sil3tll31qpi1iq50o2h3kjrmon169q lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.01]   => NSEC3 encloser error for www.seznam.cz.: range search found stale or insecure entry lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.01]   => NSEC3 depth 0: hash lg5rgspgqdoqqjko0u7fkpkakk8hgc1s lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.01]   => NSEC3 encloser error for seznam.cz.: range search found stale or insecure entry lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.01]   => trying zone: seznam.cz., NSEC3, hash f8ba757c lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.01]   => NSEC3 depth 1: hash s92e2vuk6k14pvqp4ubga1im9kpgff8a lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.01]   => NSEC3 encloser error for www.seznam.cz.: range search found stale or insecure entry lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.01]   => NSEC3 depth 0: hash 07u4nbhjigung96jklsqvtf6crqjojp8 lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.01]   => NSEC3 encloser error for seznam.cz.: range search found stale or insecure entry lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [zoncut][20220.01]   found cut: cz. (rank 002 return codes: DS 0, DNSKEY -116) lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [plan  ][20220.01]   plan 'cz.' type 'DNSKEY' uid [20220.02] lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [iterat][20220.02]     'cz.' type 'DNSKEY' new uid was assigned .03, parent uid .01 lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.03]     => skipping exact RR: rank 060 (min. 030), new TTL -14979 lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.03]     => trying zone: cz., NSEC3, hash 20b5ab23 lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.03]     => NSEC3 depth 0: hash gurgi3ems8m3ts3pvppubu3hhqkivt3l lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.03]     => NSEC3 encloser error for cz.: range search found stale or insecure entry lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [cache ][20220.03]     => skipping zone: cz., NSEC, hash 0;new TTL -123456789, ret -2 lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [select][20220.03]     => id: '03706' choosing from addresses: 0 v4 + 0 v6; names to resolve: 0 v4 + 0 v6; force_resolve: 0; NO6: IPv6 is OK lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [select][20220.03]     => id: '03706' no suitable transport, zone cut: 'cz.' lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [iterat][20220.03]     'cz.' type 'DNSKEY' new uid was assigned .04, parent uid .01 lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [select][20220.04]     => id: '28359' choosing from addresses: 0 v4 + 0 v6; names to resolve: 0 v4 + 0 v6; force_resolve: 0; NO6: IPv6 is OK lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [select][20220.04]     => id: '28359' no suitable transport, zone cut: 'cz.' lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [resolv][20220.04]     AD: request NOT classified as SECURE lis 27 12:44:19 doubrava-dns-lito-02 kresd[9742]: [resolv][20220.01]   finished in state: 8, queries: 1, mempool: 16400 B Version of knot-resolver: 5.7.0-cznic.1  When i turn off DNSSEC with trust_anchors.remove('.') and then turn it on everything works, but only for day or so. Other machines are working seamlessly. What we are doing here wrong? Thank you! -- Best regards Bc. Martin Doubrava CEO _______________________________ DOUBRAVA.NET s.r.o. Náklo 178, 783 32 Náklo Mobil: +420 771 280 361 Technická podpora: +420 776 778 173 Office: +420 588 884 000 E-mail: martin(a)doubrava.net WWW: http://www.doubrava.net  Najdete nás i na facebooku: http://www.facebook.com/doubravanet