DNS 2 SERVFAIL vs 17 BADKEY
Both DNS 2 (SERVFAIL) and 17 (BADKEY) belong to the DNS Response Codes (RCODEs) category. 2 indicates that server failure. The name server encountered an internal error while processing the query. Meanwhile, 17 means that key not recognized. The TSIG key name in the message is not configured on the server.
描述
Server failure. The name server encountered an internal error while processing the query.
何时出现
The recursive resolver could not get an authoritative answer — commonly caused by DNSSEC validation failures, unreachable upstream nameservers, or misconfigured zones.
如何修复
Try a different resolver (e.g., 8.8.8.8 or 1.1.1.1) to isolate the issue. If you control the zone, check DNSSEC signatures, SOA serial consistency, and nameserver reachability.
描述
Key not recognized. The TSIG key name in the message is not configured on the server.
何时出现
Your TSIG-signed query or update references a key name that the server does not have in its keyring, so it cannot verify the signature.
如何修复
Ensure the TSIG key name matches exactly (case-sensitive) on both client and server. Add the missing key to the server's configuration if it is a new key.
主要区别
DNS 2: Server failure. The name server encountered an internal error while processing the query.
DNS 17: Key not recognized. The TSIG key name in the message is not configured on the server.
You encounter 2 when the recursive resolver could not get an authoritative answer — commonly caused by DNSSEC validation failures, unreachable upstream nameservers, or misconfigured zones.
You encounter 17 when your TSIG-signed query or update references a key name that the server does not have in its keyring, so it cannot verify the signature.
何时使用哪个
For 2 (SERVFAIL): Try a different resolver (e.g., 8.8.8.8 or 1.1.1.1) to isolate the issue. If you control the zone, check DNSSEC signatures, SOA serial consistency, and nameserver reachability. For 17 (BADKEY): Ensure the TSIG key name matches exactly (case-sensitive) on both client and server. Add the missing key to the server's configuration if it is a new key.