Problem resolving a specific URL

Posted on 2010-11-18
Last Modified: 2012-05-10
We believe we have an internal DNS problem.  We are running Windows Server 2008R2 and Windows XP workstations.  Over 99% of our DNS queries resolve and function properly.  We encountered a problem with users attempting to reach on our LAN.  
* We can reach this site by IP address.
* We can resolve and reach the site using but not using
* On workstations we can ping or run nslookup using but not using
* On domain controllers we can ping or run nslookup using  We can ping, but cannot run nslookup using
* We can reach both addresses from our DMZ.  
* We have flushed DNS caches locally and on our domain controllers and were still able to repeate all of the above behaviors.
* Adding an entry for on our domain controller allows the domain controller to resolve, but not a workstation, perhaps due to dns forwarding.
* Adding an entry for on a local computer, resolves the issue for that computer as expected.  
Any thoughts regarding what might be causing this or how to resolve it?
Question by:isaIT
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2

Expert Comment

ID: 34167225
Out of curiousity, if you statically assign an IP to one of these workstations and set their dns server as an outside dns (Such as does it resolve your issue?
LVL 71

Expert Comment

by:Chris Dent
ID: 34167731

Do you have Forwarders configured on your DNS servers at the moment?

When you attempt to resolve using nslookup, what happens? Timeout? Server Failure? Doesn't exist?


Author Comment

ID: 34167950
Thank you for the comments,

When we statically assign an IP to one of the workstations and set their dns server to an outside dns, it does resolve the issue.

We do have DNS forwarders configured for everything outside of our domain..

When we attempt to resolve using nslookup it times out.  

Here is another interesting bit of information we just discovered, this doesn't explain why it won’t resolve from our LAN.

When we do an nslookup on vs we see different IP addresses depending upon the DNS sever we query.

 Internal nslookup using or
- resolves to  Address:
- does not resolve
External lookup using or
- resolves to  Address:
-  resolves to
External lookup using
- resolves to  Address:
-  resolves to

Both and bring up the target web site.
Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users


Expert Comment

ID: 34168000
Are your computers setup to obtain IP addresses via DHCP or Manually? Have you checked to make sure that the DNS that DHCP is assigning is correct?

LVL 71

Accepted Solution

Chris Dent earned 250 total points
ID: 34168052

If you use Forwarders on your DNS servers no amount of clearing the cache will do any good, the answer (or lack of answer) is inherited from the forwarder.

You might try setting your internal DNS server to forward to and (both belong to Google).


Author Comment

ID: 34168058
We are using DHCP.  This appears to be working preperly and is assigning the correct DNS server.

Author Closing Comment

ID: 34168141
Thanks for the help Chris.  You rock.

Featured Post

On Demand Webinar: Networking for the Cloud Era

Ready to improve network connectivity? Watch this webinar to learn how SD-WANs and a one-click instant connect tool can boost provisions, deployment, and management of your cloud connection.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A procedure for exporting installed hotfix details of remote computers using powershell
For anyone that has accidentally used newSID with Server 2008 R2 (like I did) and hasn't been able to get the server running again because you were unlucky (as I was) and had no backups - I was able to get things working by doing a Registry Hive rec…
This tutorial will give a short introduction and overview of Backup Exec 2012 and how to navigate and perform basic functions. Click on the Backup Exec button in the upper left corner. From here, are global settings for the application such as conne…
This tutorial will show how to configure a new Backup Exec 2012 server and move an existing database to that server with the use of the BEUtility. Install Backup Exec 2012 on the new server and apply all of the latest hotfixes and service packs. The…
Suggested Courses

632 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question