Solved

Unable to access sec.gov by name

Posted on 2010-11-12
7
856 Views
Last Modified: 2012-05-10
We are having an issue accessing sec.gov website, it seems to be hit or miss.  No reports of any other websites not being accessible.  Am pretty sure it is nothing on their side, but something in our DNS.  We are able to get to the site if we connect to our external DSL line or I remote into my home machine.  We are using MS DNS server on our domain controllers. OS = 2008r2. Below are the steps I have gone through, doing "ipconfig /flushdns" and "ipconfig /registerdns" after most steps:

Unable to ping sec.gov
Unable to ping sec.gov by IP - most likely have responses turned off
Added googles public dns as a forwarder on our DNS servers (with our ISP provided DNS servers) and moved it to top of the list.
Removed our ISPs provided DNS server and left just the google DNS server  
Restart DNS server service

The below work, but are just work arounds not resolutions:
Statically set the DNS server in the NIC to googles public dns (8.8.8.8) and able to get out without issue.
Able to access the site by typing the IP address instead of the name

Any other assistance troubleshooting this would be great.  Thanks ahead of time.
0
Comment
Question by:DebelloCaminus
  • 3
  • 3
7 Comments
 
LVL 9

Expert Comment

by:avilov
Comment Utility
check if your DNS server has conditional forwarding set for that domain
0
 

Author Comment

by:DebelloCaminus
Comment Utility
Avilov,
   Thanks for the response.  Checked conditional forwarding on both servers and there are none set.  Also for more information.  This does seems to be only happening in our 1 site, out of 4.  All DNS servers are suppose to be replicating with each other and they seem to be without issue.  I went through all settings of the dns server that seems to work ok and the one that isn't.

I turned on logging and attempted to access sec.gov again.  Everything seems to be ok to me.  I can attached log if needed.

Thanks again
0
 
LVL 12

Accepted Solution

by:
Amit Bhatnagar earned 500 total points
Comment Utility
Try this :

Run this command on the Server with this issue :

dnscmd /Config /EnableEDnsProbes 0

As per article. It is for 2003 but i have noticed and resolved similar issues in 2008 as well.

http://support.microsoft.com/kb/828731
0
Threat Intelligence Starter Resources

Integrating threat intelligence can be challenging, and not all companies are ready. These resources can help you build awareness and prepare for defense.

 

Author Comment

by:DebelloCaminus
Comment Utility
This article actually makes sense.  We are using a Cisco ASA device for our firewall and its an older version of the IOS.  My only question would be, is anything else dependent on the EDNS being enabled?  As a current work around I statically set an outside dns server (8.8.8.8) as in our DHCP options.
0
 
LVL 12

Expert Comment

by:Amit Bhatnagar
Comment Utility
None..It's a feature which was started with Windows 2003 and I was working with Microsoft Networking Team at that time. We disabled this feature in almost 100% of all the issues that came by us and it worked. No one came back saying disabling it broke one of the other functionalities.

Do try it and let us know the result :)

-Amit Bhatnagar.
0
 

Author Comment

by:DebelloCaminus
Comment Utility
Amit,
   Thanks for the info.  I ran the commands on both our DNS servers and removed the 8.8.8.8 entry from our DHCP options.  Ran ipconfig /flushdns and ipconfig /registerdns for good measure and am able to get to all the sites I wasn't able to before!

Thanks again
0
 
LVL 12

Expert Comment

by:Amit Bhatnagar
Comment Utility
Glad it worked !! :)
-Amit.
0

Featured Post

Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

Join & Write a Comment

Most DNS problems are VERY easily troubleshot and identifiable if you can follow the steps a DNS query takes. I would like to share the step-by-step a DNS query takes from the origin to the destination. _____________________________________________…
I will assume you are running a non-server version of some sort of Windows throughout this article. There are many flavors of Windows since Windows Server 2000 - 2008, XP Home & Pro, Vista Home & Pro, and Windows 7 Starter, Home, Pro, Ultimate, etc.…
In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

771 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

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now