DNS 2 SERVFAIL vs 7 YXRRSET
Both DNS 2 (SERVFAIL) and 7 (YXRRSET) 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, 7 means that rR Set Exists when it should not. A resource record set exists that the update prerequisite says should not.
Deskripsi
Server failure. The name server encountered an internal error while processing the query.
Ketika Anda Melihatnya
The recursive resolver could not get an authoritative answer — commonly caused by DNSSEC validation failures, unreachable upstream nameservers, or misconfigured zones.
Cara Memperbaiki
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.
Deskripsi
RR Set Exists when it should not. A resource record set exists that the update prerequisite says should not.
Ketika Anda Melihatnya
A DNS UPDATE failed because a specific RRset (e.g., an A record) already exists when the prerequisite required it to be absent.
Cara Memperbaiki
Delete the conflicting RRset before retrying the update, or adjust your prerequisite conditions to match the actual zone state.
Perbedaan Utama
DNS 2: Server failure. The name server encountered an internal error while processing the query.
DNS 7: RR Set Exists when it should not. A resource record set exists that the update prerequisite says should not.
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 7 when a DNS UPDATE failed because a specific RRset (e.g., an A record) already exists when the prerequisite required it to be absent.
Kapan Menggunakan Yang Mana
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 7 (YXRRSET): Delete the conflicting RRset before retrying the update, or adjust your prerequisite conditions to match the actual zone state.