Please add 'ngacn.cc' into whitelist.

[yukixz]

% dig bbs.ngacn.cc

; <<>> DiG 9.8.3-P1 <<>> bbs.ngacn.cc
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: *
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2

;; QUESTION SECTION:
;bbs.ngacn.cc.          IN  A

;; ANSWER SECTION:
bbs.ngacn.cc.       3600    IN  A   118.144.73.137

;; AUTHORITY SECTION:
ngacn.cc.       4350    IN  NS  dns1.ngacn.cc.
ngacn.cc.       4350    IN  NS  dns2.ngacn.cc.

;; ADDITIONAL SECTION:
dns1.ngacn.cc.      39900   IN  A   118.144.73.145
dns2.ngacn.cc.      51135   IN  A   118.144.73.141

;; Query time: 12 msec
;; SERVER: *
;; WHEN: Fri Oct 16 13:23:33 2015
;; MSG SIZE  rcvd: 116