Non-authoritative answer:
Name: vip1.studyisland.com
Address: 72.249.13.58
Aliases: www.studyisland.com
So looks like possible dns cache corruption on your DNS server.
(What I see from my end) (this could be due to access list on what
traffic its accepting)
> server 198.153.192.1
Default Server: [198.153.192.1]
Address: 198.153.192.1
> www.studyisland.com.
Server: [198.153.192.1]
Address: 198.153.192.1
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to [198.153.192.1] timed-out
Have you turned on debug log for dns, and look into that one?
Have you tried, to do that DNS lookup from the DNS Server itself to the
upstream DNS forwarder, and see if it resolves and then take a look at
it from the DNS cache ( You will probably need wireshark on the
workstation and server in question to see what is going on with the
packets. I will be happy to look at any pcap files you would want to
send over on the situation.
Z
Edward E. Ziots, CISSP, Security +, Network +
Security Engineer
Lifespan Organization
ezi...@lifespan.org
From: John Hornbuckle [mailto:john.hornbuc...@taylor.k12.fl.us]
Sent: Tuesday, August 14, 2012 1:42 PM
To: NT System Admin Issues
Subject: DNS Lookup Failing for One Address
Okay, DNS wizards... I need some input.
One of my DNS servers (Server 2008) is failing to resolve
www.studyisland.com like so:
C:\>nslookup
Default Server: aoc-pet300.taylor.k12.fl.us
Address: 10.11.7.13
> www.studyisland.com.
Server: aoc-pet300.taylor.k12.fl.us
Address: 10.11.7.13
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to aoc-pet300.taylor.k12.fl.us timed-out
But I can point nslookup at one of my other servers (also Server 2008),
and it resolves fine. Which kind of sounds like a server problem--but
this server has resolved every other name I've thrown at it, though.
Only this one is failing.
I can point nslookup at the Norton DNS server that my failing server
uses as a forwarding server (198.153.192.1), and it resolves fine. All
of my other servers use that same forwarding address, too.
I'm kind of going crazy here... My users desperately need to get to this
site. I can't figure out what's wrong, but that's no surprise because
I'm not an expert when it comes to DNS.
Can anyone offer any troubleshooting pointers?
John Hornbuckle, MSMIS, PMP
MIS Department
Taylor County School District
www.taylor.k12.fl.us
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