DNS 5 REFUSED vs 20 BADNAME
Both DNS 5 (REFUSED) and 20 (BADNAME) 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, 20 means that duplicate key name. The key name in a TKEY negotiation is already in use or conflicts with an existing key.
คำอธิบาย
Query refused. The name server refuses to perform the requested operation for policy reasons.
เมื่อคุณพบเห็น
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.
วิธีแก้ไข
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.
คำอธิบาย
Duplicate key name. The key name in a TKEY negotiation is already in use or conflicts with an existing key.
เมื่อคุณพบเห็น
A TKEY key establishment failed because a key with the same name already exists on the server from a previous session that was not properly cleaned up.
วิธีแก้ไข
Use a unique key name for each TKEY session (e.g., append a timestamp or random suffix). Delete stale keys on the server if they are no longer needed.
ความแตกต่างหลัก
DNS 5: Query refused. The name server refuses to perform the requested operation for policy reasons.
DNS 20: Duplicate key name. The key name in a TKEY negotiation is already in use or conflicts with an existing key.
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 20 when a TKEY key establishment failed because a key with the same name already exists on the server from a previous session that was not properly cleaned up.
ควรใช้อันไหนเมื่อไร
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 20 (BADNAME): Use a unique key name for each TKEY session (e.g., append a timestamp or random suffix). Delete stale keys on the server if they are no longer needed.