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.
説明
No error condition. The query completed successfully and the response contains the requested data.
このコードが表示される場合
This is the normal, successful response to any DNS query — the name was resolved and the answer section contains the requested records.
解決方法
No fix needed. RCODE 0 means the DNS lookup succeeded as expected.
説明
Duplicate key name. The key name in a TKEY negotiation is already in use or conflicts with an existing key.
このコードが表示される場合
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.
解決方法
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.
主な違い
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.
どちらをいつ使うか
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.