DNS 5 REFUSED vs 8 NXRRSET
Both DNS 5 (REFUSED) and 8 (NXRRSET) belong to the DNS Response Codes (RCODEs) category. 5 indicates that query refused. The name server refuses to perform the requested operation for policy reasons. Meanwhile, 8 means that rR Set that should exist does not. A required resource record set is missing from the zone.
Описание
Query refused. The name server refuses to perform the requested operation for policy reasons.
Когда вы это видите
The server rejected your query due to access control — for example, a recursive resolver that only serves its own network, or a zone transfer blocked by ACL.
Как исправить
Check the server's allow-query, allow-recursion, or allow-transfer ACLs. If you are not authorized to use this resolver, switch to a public DNS service.
Описание
RR Set that should exist does not. A required resource record set is missing from the zone.
Когда вы это видите
A DNS UPDATE prerequisite expected a certain RRset to exist (e.g., an MX record), but the zone does not contain it.
Как исправить
Create the missing RRset in the zone before retrying the update, or change the prerequisite to not require its existence.
Ключевые различия
DNS 5: Query refused. The name server refuses to perform the requested operation for policy reasons.
DNS 8: RR Set that should exist does not. A required resource record set is missing from the zone.
You encounter 5 when the server rejected your query due to access control — for example, a recursive resolver that only serves its own network, or a zone transfer blocked by ACL.
You encounter 8 when a DNS UPDATE prerequisite expected a certain RRset to exist (e.g., an MX record), but the zone does not contain it.
Когда что использовать
For 5 (REFUSED): Check the server's allow-query, allow-recursion, or allow-transfer ACLs. If you are not authorized to use this resolver, switch to a public DNS service. For 8 (NXRRSET): Create the missing RRset in the zone before retrying the update, or change the prerequisite to not require its existence.