Windows Server 2008 DNS using root hints returning SERVFAIL

Discussion in 'DNS Server' started by Dr Pizza, Mar 9, 2010.

  1. Dr Pizza

    Dr Pizza Guest

    So, since I have no reliable DNS server to forward through (my ISP's is crap,
    OpenDNS is untrustworthy) my WS2008 DNS server is operating as a caching
    resolver using root hints performing recursive queries.

    Some domains are causing problems, for example techdirt.com. The domain has
    NS records with a 2-day TTL, but the A-record only has a 15 minute TTL. The
    initial lookup works fine, but once the 15 minutes has passed, Windows is
    just giving me SERVFAIL. If I wait 2 days (for the whole thing to expire) or
    manually purge the techdirt.com entries, name resolution works for a further
    15 minutes, then back to SERVFAIL.

    As best I can tell, the server isn't even trying to re-resolve the name,
    it's just straight up failing. The MaxCacheTTL is set to 2 days per
    http://support.microsoft.com/default.aspx?scid=kb;EN-US;968372, but this
    appears to do nothing useful.

    This behaviour obviously is not very useful.
     
    Dr Pizza, Mar 9, 2010
    #1
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  2. Dr Pizza

    danny Guest

    I am also seeing this behaviour. Completely useless.

    How do you manually purge the entries?
     
    danny, May 21, 2010
    #2
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