The following messages are observed in
pdns: Not authoritative for 'domain.com', sending servfail to 220.127.116.11
Incorrect named service configuration
/etc/named.conf on the DNS server:
As a result notifications for zones update are not accepted from PBAS server (accepted only from 18.104.22.168).
Add PBAS server in allow-notify hosts in
/etc/named.conf configuration file.