DNS 0 NOERROR vs 20 BADNAME
Both DNS 0 (NOERROR) and 20 (BADNAME) belong to the DNS Response Codes (RCODEs) category. 0 indicates that no error condition. The query completed successfully and the response contains the requested data. Meanwhile, 20 means that duplicate key name. The key name in a TKEY negotiation is already in use or conflicts with an existing key.
Описание
No error condition. The query completed successfully and the response contains the requested data.
Когда вы это видите
This is the normal, successful response to any DNS query — the name was resolved and the answer section contains the requested records.
Как исправить
No fix needed. RCODE 0 means the DNS lookup succeeded as expected.
Описание
Duplicate key name. The key name in a TKEY negotiation is already in use or conflicts with an existing key.
Когда вы это видите
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.
Как исправить
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.
Ключевые различия
DNS 0: No error condition. The query completed successfully and the response contains the requested data.
DNS 20: Duplicate key name. The key name in a TKEY negotiation is already in use or conflicts with an existing key.
You encounter 0 when this is the normal, successful response to any DNS query — the name was resolved and the answer section contains the requested records.
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.
Когда что использовать
For 0 (NOERROR): No fix needed. RCODE 0 means the DNS lookup succeeded as expected. 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.