10.6.5 DNS problems

Discussion in 'macOS' started by Jadzea, Nov 15, 2010.

  1. Jadzea macrumors newbie

    Apr 19, 2010
    Since upgrading to 10.6.5 I have had DNS problems.

    Whilst nslookup and ping will resolve the DNS names to their correct IP addresses, safari and other services won't.

    The problem seems to be related purely to CNAME entries which are in a different forward lookup zone to the A record.

    For instance if we had a forward lookup zone of foo.bar and an A record of www going to (www.foo.bar = and then a CNAME record of go in a zone bloo.by (go.bloo.by = www.foo.bar) then ping and nslookup will resolve go.bloo.by to but it seems safari can't.

    Anyone else??

    Read more about this problem and similar DNS issues here http://discussions.apple.com/thread.jspa?threadID=2648002&tstart=0
  2. Panch0 macrumors 6502a

    Feb 23, 2010
    I've got the problem, but no solution.

    Thought I had a corrupted update, but I did a fresh Install over the weekend and the problem persists.
  3. Jadzea thread starter macrumors newbie

    Apr 19, 2010
    Out of zone CNAME problem fixed

    To fix this problem you need to change your CNAMEs to A records.

    It seems that mac os x 10.6.5 doesn't trust domains that are aliases for A records in a different zone. Understandably I think when you start to think about the potential for hackers/viruses etc.
  4. RevyGuy macrumors newbie

    Nov 27, 2010
    simple fix?

    at work we run MS Exchange 2003 and are on an older Windows Server (2003) as well - I can access the server for files, etc but exchange won't work internally, nor will remote desktop.

    any ideas on an easy (non-technical) fix - about 40% of us are on Mac's and our IT department (of only 2) can't figure this one out.
  5. PraveenBhalla, Nov 29, 2010
    Last edited: Dec 1, 2010

    PraveenBhalla macrumors newbie

    Nov 29, 2010
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  6. Panch0 macrumors 6502a

    Feb 23, 2010
    So I am still seeing this issue in safari (and other browsers), but Mail seems to be behaving better. As soon as I discovered the issue, I went into Mail Preferences and set up the internal and external addresses for our exchange server. This didn't work immediately, and I had to keep switching the settings for the "internal" server depending if I was at home or the office.

    At some point, internal/external settings finally started working again. I deleted and recreated the account several times. Not sure what finally resolved it - I think it was probably recreating the account while on the internal network and setting both addresses right from the beginning.

    If I have to hit one of the CNAMEd servers from a browser, they work on Windows from a VM...

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