Hello list, One of colleague in Japan Unbound Users Group reports the following problem, and I could reproduce. Environ: - his - unbound-1.3.3 + ldns-1.6.1 + libevent-1.4.2-stable - mine - vanilla built unbound-1.3.3 Problem: At first trial, unbound could resolve "www.rurubu.com". After 1 hour(is its TTL), query to unbound on "www.rurubu.com" ends with SERVFAIL. Some condition observed: # authoritative answer on "www.rurubu.com" doesn't # contain ADDITIONAL SECTION. # I know that RFC 1035 says additional section is # "a posibilly empty list", so this is notable, but # no problem. kohi at guest1[19]% dig @ns1.visualjapan.co.jp www.rurubu.com ; <<>> DiG 9.5.0-P2 <<>> @ns1.visualjapan.co.jp www.rurubu.com ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 45680 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.rurubu.com. IN A ;; ANSWER SECTION: www.rurubu.com. 3600 IN A 202.143.76.167 ;; Query time: 13 msec ;; SERVER: 210.225.98.1#53(210.225.98.1) ;; WHEN: Mon Sep 7 23:35:46 2009 ;; MSG SIZE rcvd: 48 # Authority on visualjapan.co.jp is deletgated to # those 3 servers. kohi at guest1[22]% dig +norec @a.dns.jp visualjapan.co.jp NS : (snip) : ;; AUTHORITY SECTION: visualjapan.co.jp. 86400 IN NS ns2.visualjapan.co.jp. visualjapan.co.jp. 86400 IN NS ns1.visualjapan.co.jp. visualjapan.co.jp. 86400 IN NS ns-tk022.ocn.ad.jp. # but one(ns-tk002.ocn.ad.jp) is lame delegated. kohi at guest1[23]% dig +norec @ns-tk022.ocn.ad.jp ns1.visualjapan.co.jp ; <<>> DiG 9.5.0-P2 <<>> +norec @ns-tk022.ocn.ad.jp ns1.visualjapan.co.jp ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 28896 ;; flags: qr ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;ns1.visualjapan.co.jp. IN A ;; Query time: 13 msec ;; SERVER: 203.139.160.104#53(203.139.160.104) ;; WHEN: Mon Sep 7 23:41:15 2009 ;; MSG SIZE rcvd: 39 Though I can provide log with verbosity: 5 and the result of unbound-control dump_cache, but these have quite large amount to post this list, so I can send them off-list if you need, or let me known appropriate keyword to grep, or appropriate verbosity setting. Thanks Koh-ichi Ito