How should i resolve this issues :
WARNING: Looks like the parent servers do not have information for your TLD when asked. This is ok but can be confusing.
ERROR: One or more of your nameservers did not respond:
The ones that did not respond are:
We have 3 Windows DNS server 2 (.50 (Primary) &.51 (secondary)) are on same subnet and .148(secondary) are different.
Windows firewall is already off and port 53 allow on firewall. if i am going to resolve primary DNS IP on .148 server i receive the error "Unable to Resolve FQDN" kindly review attach image.
.51 FQDN is resolve without any issue.