Does AAAA records work now ?

[Spacedust]

Thanks. Now I will test again.

[Spacedust]

Almost good - now having something like this:

FAIL: While quering domain's records, some of your name servers didn't responded. Name servers which didn't responded:

    udp6:2001:41d0:a:f438::1
    udp6:2a01:4f8:120:134d::2

WARNING: Couldn't connect using TCP protocol:

    tcp6:2001:41d0:a:f438::1
    tcp6:2a01:4f8:120:134d::2

Check your name server's configurations and firewall rules. When response to a DNS query exceeds 512 bytes, TCP is negotiated and used, all name servers should allow TCP connections (port 53).

WARNING: We found different serial numbers on your name servers, it's OK if you had modified your zone recently.

    2001:41d0:a:f438::1: 0
    2a01:4f8:120:134d::2: 0
    37.187.123.56: 2015050520
    78.46.85.86: 2015050520
    78.46.85.90: 2015050520

Having different serials on your name servers may show inconsistencies between name servers configuration (multiple masters), or communication errors (ACL and firewall issues).

[MRatWork]

Try investigate /etc/pdns/pdns.conf related to 'listen' IPv6.