why do I get "No response from server"

[Andrew Watkins]

I am still trying to fix a problem where some users round the world who 
can not get an IP address for our server. http://www.lkl.ac.uk

I have checked and our DNS seems to be working correctly. (i have tested 
on many DNS web sites. i.e. www.dnsstuff.com)

I have tried a few open name-servers and I some times get the following 
error:

nslookup
 > server 202.12.233.10

 > www.lkl.ac.uk.
Server:  ns.ntcif.telstra.com.au
Address:  202.12.233.10

*** ns.ntcif.telstra.com.au can't find www.lkl.ac.uk.: No response from 
server
 >

but if I try another lookup on another address:

 > www.dcs.bbk.ac.uk.
Server:  ns.ntcif.telstra.com.au
Address:  202.12.233.10

Name:    rhea.dcs.bbk.ac.uk
Address:  193.61.29.2
Aliases:  www.dcs.bbk.ac.uk

Any pointers.....

Andrew
PS.
One think to note:

The address 193.61.29.33 is registered under 2 different domains:
		dcs.bbk.ac.uk. 	and 	lkl.ac.uk.

Thats is why I have set up a CNAME
	www.lkl.ac.uk => thor.dcs.bbk.ac.uk => 193.61.29.33