Certain domain cannot access

hi there,

im beginner in solaris 10.

we are using solaris 10 as our DNS server

                       Solaris 10 8/07 s10s_u4wos_12b SPARC
           Copyright 2007 Sun Microsystems, Inc.  All Rights Reserved.
                        Use is subject to license terms.
                            Assembled 16 August 2007

Generic_120011-14
BIND 9.3.4

i had a problem now, certain domain like pos.com.my cant access. what should i do?

i already nslookup pos.com.my and show

;; connection timed out; no servers could be reache

pls help me