Got a #DNS problem... using #BIND, with #Cloudflare 1.1.1.1 resolvers as my forwarders. Since a few days ago I can no longer look up PTRs for IPv6 addresses; all return SERVFAIL. Looking up the same addresses directly against Cloudflare, it works. Using different forwarders in BIND (e.g. my ISP's), it works.

These are the errors in the BIND logs:

Sep 26 20:37:37 server.example.com named[708943]: FORMERR resolving 'a.2.ip6.arpa/DS/IN': ::1#1053
Sep 26 20:37:37 server.example.com named[708943]: no valid DS resolving '4.0.0.2.0.0.0.0.0.0.0.0.0.0.0.0.3.2.8.0.9.0.0.4.0.5.4.1.0.0.a.2.ip6.arpa/PTR/IN': ::1#1053


Searches for these errors have not turned up anything that has helped.

Any gurus out there able to shed any light?