> We see that the server does indeed conduct a
> recursive attempt to 
> resolve the authoritative servers for www.sun.com,
> (namely ns1.sun.com) 
> but the subsequent query to ns1.sun.com for
> www.sun.com times out!
> 
> A snoop of the output during the DIG trace indicates
> that a DNS query 
> packet leaves the server for the firewall (this is
> confirmed by firewall 
> logs) but I receive NO reply from ns1.sun.com.

Sounds like "ns1.sun.com" was hosed.

What do you get when you do the following:

nslookup
set type=soa
sun.com
...
Non-authoritative answer:
sun.com
        origin = ns.sun.com
        mail addr = hostmaster.sun.com
        serial = 2006122201
        refresh = 3600
        retry = 1200
        expire = 1038800
        minimum = 900

Authoritative answers can be found from:
sun.com nameserver = ns7.sun.com.
sun.com nameserver = ns8.sun.com.
sun.com nameserver = ns1.sun.com.
sun.com nameserver = ns2.sun.com.
ns1.sun.com     internet address = 192.18.128.11
ns2.sun.com     internet address = 192.18.99.5
ns7.sun.com     internet address = 192.18.42.12
ns8.sun.com     internet address = 192.18.43.12
^D

Try some of the other servers on this list.
 
 
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