dns not resolving some domains

Discussion in 'DNS Server' started by Guest, Jan 5, 2004.

  1. Guest

    Guest Guest

    We are having mail problems and I suspect dns. If I
    perform an NSLOOKUP against my dns server:
    I first set type=mx, then I try to resolve something
    like "yahoo.com". I get the whole mail server list for
    yahoo.com. But for some reason, if I try to do the same
    thing for some other domains (most notable aol.com and
    earthlink.net) I get "DNS Request timed out". If set the
    server to an external dns server, I can list all the mx
    records for those domains. I have cleared the cache. What
    could the problem be?
     
    Guest, Jan 5, 2004
    #1
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  2. In <> posted a question
    Then Kevin replied below:
    : We are having mail problems and I suspect dns. If I
    : perform an NSLOOKUP against my dns server:
    : I first set type=mx, then I try to resolve something
    : like "yahoo.com". I get the whole mail server list for
    : yahoo.com. But for some reason, if I try to do the same
    : thing for some other domains (most notable aol.com and
    : earthlink.net) I get "DNS Request timed out". If set the
    : server to an external dns server, I can list all the mx
    : records for those domains. I have cleared the cache. What
    : could the problem be?

    This one is getting very popular.

    Is this server behind a firewall?
    If it is, I suspect this is a EDNS0 issue, this has been prevalent on Win2k3
    because EDNS0 is not widely supported yet. Many firewalls will not allow UDP
    packets more than 512 bytes, causing some external queries to fail. You can
    turn off EDNS0 to stop this behavior.
    828731 - An External DNS Query May Cause an Error Message in Windows Server
    2003
    http://support.microsoft.com/default.aspx?scid=kb;en-us;828731&Product=winsvr2003

    --
    Best regards,
    Kevin D4 Dad Goodknecht Sr. [MVP]
    Hope This Helps
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    Kevin D. Goodknecht [MVP], Jan 6, 2004
    #2
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  3. d> What could the problem be?

    EDNS0, for one thing.
     
    Jonathan de Boyne Pollard, Jan 6, 2004
    #3
  4. Guest

    Guest Guest

    That was my problem! Thanks for the help!
     
    Guest, Jan 6, 2004
    #4
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