nslookup: giving error when used with UDP

[sekhar n]

 Hi all,
 
i am facing the problem with DNS/BIND.
 
when I tried nslookup (from the machine with Tru64 Unix OS) without any option (meaning it uses UDP to send 
the packets), the server is returning the error.
nslookup hostname
can't find hostname: Server failed
 
When I used nslookup -vc option(if you mention -vc option, then it uses 
TCP to send packets), the server is responding properly.
 
nslookup -vc hostname
This time it is giving the IP address of the hostname by using the default server.
 
Any help is appreciated.
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