one domain is dig from one server but not with another server

[Nayeem]

Dear All,

When I dig domain arabnews.com from slave dns server then get result but
when I dig same domain from primary dns server then I message

# dig arabnews.com

; <<>> DiG 9.3.2 <<>> arabnews.com
;; global options:  printcmd
;; connection timed out; no servers could be reached
#

When I dig same domain from slave server then I get result.


# dig arabnews.com

; <<>> DiG 9.3.2 <<>> arabnews.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 973
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 3

;; QUESTION SECTION:
;arabnews.com.                  IN      A

;; ANSWER SECTION:
arabnews.com.           12527   IN      A       195.224.89.124

;; AUTHORITY SECTION:
arabnews.com.           12527   IN      NS      ns1.sahara.com.sa.
arabnews.com.           12527   IN      NS      ns2.sahara.com.sa.
arabnews.com.           12527   IN      NS      ns3.sahara.com.sa.

;; ADDITIONAL SECTION:
ns1.sahara.com.sa.      18956   IN      A       212.76.68.200
ns2.sahara.com.sa.      11498   IN      A       212.76.68.201
ns3.sahara.com.sa.      13739   IN      A       212.58.154.100

;; Query time: 2 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu May  3 11:08:20 2007
;; MSG SIZE  rcvd: 161


So can any one had any idea what could be the reason.

Regards,
Nayeem.