why do I get "No response from server"

[Andrew Watkins]

Big thanks and problem solved.

It took a while but after £35 for "DNS and BIND, 5th Edition" book and 
some more searching. I located some information about "packet-filtering 
firewalls that are configured to allow nameserver-to-nameserver traffic 
but not resolver-to-nameserver traffic, because they typically expect 
nameserver-to-nameserver traffic to originate from port 53 and terminate 
at port 53"

Anyway, with this information I could force the people who maintain our 
firewall (if we looked after it our-selfs we could have solved this 
problem weeks ago!) to look into it and after another 3 weeks they came 
back to me telling me that a lot of traffic was being blocked.

I useful site is http://194.242.112.64/~willemijns/dns.htm which gives a 
list of open name servers which I could test our site on.

Hopefully all is well and thanks for all who helped.

Andrew


Andrew Watkins wrote:
> 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
> 
>