[Pdns-users] Strange Server Fail

[Dmitry Rybin]

Hello!
I have strange servfail:
 11 14.899135000 111.111.111.111 -> 192.168.11.32 DNS 86 Standard query
0x8f7d  A vpn.corbina.net
 12 14.899238000 192.168.11.32 -> 111.111.111.111 DNS 155 Standard query
response 0x8f7d  A 78.107.1.52 A 78.107.1.50 A 78.107.1.51 A 85.21.0.66 A
78.107.1.49
 13 37.507843000 111.111.111.111 -> 192.168.11.32 DNS 86 Standard query
0x024e  A vpn.corbina.net
 14 37.510843000 192.168.11.32 -> 111.111.111.111 DNS 155 Standard query
response 0x024e  A 78.107.1.51 A 85.21.0.66 A 78.107.1.50 A 78.107.1.49 A
78.107.1.52
 15 66.801731000 111.111.111.111 -> 192.168.11.32 DNS 86 Standard query
0xcd2a  A vpn.corbina.net
 16 66.801887000 192.168.11.32 -> 111.111.111.111 DNS 75 Standard query
response 0xcd2a Server failure
 17 72.972029000 111.111.111.111 -> 192.168.11.32 DNS 86 Standard query
0xa693  A vpn.corbina.net
 18 72.972189000 192.168.11.32 -> 111.111.111.111 DNS 75 Standard query
response 0xa693 Server failure
 19 75.549483000 111.111.111.111 -> 192.168.11.32 DNS 86 Standard query
0x49db  A vpn.corbina.net


#dig vpn.corbina.net

; <<>> DiG 9.9.4 <<>> vpn.corbina.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59603
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;vpn.corbina.net.               IN      A

;; ANSWER SECTION:
vpn.corbina.net.        60      IN      A       85.21.0.66
vpn.corbina.net.        60      IN      A       78.107.1.51
vpn.corbina.net.        60      IN      A       78.107.1.50
vpn.corbina.net.        60      IN      A       78.107.1.49
vpn.corbina.net.        60      IN      A       78.107.1.52

;; Query time: 6 msec
;; SERVER: 213.234.192.7#53(213.234.192.7)
;; WHEN: Wed Feb 12 00:57:00 MSK 2014
;; MSG SIZE  rcvd: 113

=============
allow-from=0.0.0.0/0
threads=5
forward-zones=local=127.0.0.1
local-address=127.0.0.2,192.168.10.32,192.168.11.32
log-common-errors=no
max-cache-entries=1000000
quiet=yes
version-string=dns1 p
#lua-dns-script=/usr/local/etc/pdns/dns.lua


disable-packetcache=no
max-packetcache-entries=3000000
single-socket=off
=============
pdns-recursor                      3.5.3-1 (from powerdns.com)
Linux Debian Wheezy. amd64
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