DNS Intermittent name resolution RRS feed

  • Question

  • Within Windows 2003 environment, with a DC with DHCP, DNS and RRAS services, we are experiencing intermittent dns name resolution.  IP addresses can resolve to websites, but name lookups fail to return. NSlookup times out during these intermittent sessions as well. 

    A network trace using MS Network Monitor 3.4 shows DNS queries, but no answers.  I'm not really sure what I should be looking for within the data to troubleshoot the DNS name resolution.  It seems like traffic wants to return but is stalled or rerouted along the way back.

    Any advise is appreciated!

    Tuesday, August 24, 2010 2:13 AM

All replies

  • The only thing you can verify is that the IP address of your DNS server is correct.  If it is and there is no response, then it seems that either the resopnse never makes it to the DNS server or the DNS server is not responding to the request.

    The next step is to troubleshoot the DNS server during these periods.  A trace on the server would verify that the DNS machine received the request.  Performance logs on the DNS server can tell you if it gets into a state where it is too busy to answer requests.  It seems that if NSLookup also fails during this time, then it makes sense the DNS server is where the problem lies.  Perhaps NSLookup from another machine would also be a good test to determine it's the DNS server at fault and not the client.


    Tuesday, August 24, 2010 2:04 PM
  • Hi,

    The answer from Paul Long makes perfect sense. The DNS resolution is faulty, but you have to check what is the TCP/IP configuration of the hosts with the problem. Moreover, if you have identified the faulty DC, what you can do is to schedule a reset of the server to erase the DNS resolution cache. If this doesn't resolve your issue you can try to schedule a maintenance of the DNS servers in your infrastructure. It could be that some DNS server has a corrupt DNS file and it's sending faulty resolutions.

    Alfredo Arizaleta  

    Disclaimer: This posting is provided "AS IS" with no express or implied warranties or rights.
    Tuesday, September 21, 2010 12:21 AM