I can't seem to work out why my DNS isn't working properly, if I run dig from the nameserver it functions correctly:

# dig ungl.org

; <<>> DiG 9.5.1-P2.1 <<>> ungl.org
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24585
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1

;; QUESTION SECTION:
;ungl.org.                      IN      A

;; ANSWER SECTION:
ungl.org.               38400   IN      A       188.165.34.72

;; AUTHORITY SECTION:
ungl.org.               38400   IN      NS      ns.kimsufi.com.
ungl.org.               38400   IN      NS      r29901.ovh.net.

;; ADDITIONAL SECTION:
ns.kimsufi.com.         85529   IN      A       213.186.33.199

;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sat Mar 13 01:04:06 2010
;; MSG SIZE  rcvd: 114

but when I run it from another server in the same datacenter I receive:

# dig @87.98.167.208 ungl.org

; <<>> DiG 9.5.1-P2.1 <<>> @87.98.167.208 ungl.org
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 18787
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;ungl.org.                      IN      A

;; Query time: 1 msec
;; SERVER: 87.98.167.208#53(87.98.167.208)
;; WHEN: Sat Mar 13 01:01:35 2010
;; MSG SIZE  rcvd: 26

my zone file for this domain is

$ttl 38400
ungl.org.       IN  SOA r29901.ovh.net. mikey.aol.com. (
                201003121
                10800
                3600
                604800
                38400 )
ungl.org.       IN  NS  r29901.ovh.net.
ungl.org.       IN  NS  ns.kimsufi.com.
ungl.org.       IN  A   188.165.34.72
localhost.      IN  A   127.0.0.1
www             IN  A   188.165.34.72

The server is running Ubuntu 9.10 and Bind 9, if anyone can shed some light on this for me it'd make me very happy!

thanks