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Windows Thread, DNS error 4521 & 9999 in Technical; Hi all, I am receiving error 4521 and 9999 in DNS, the 4521 have been appearing for a while but ...
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    DNS error 4521 & 9999

    Hi all, I am receiving error 4521 and 9999 in DNS, the 4521 have been appearing for a while but the 9999 have shown early this morning about every hour any ideas??

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    And the text of the error is...?

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    Ran the DCDIAG /TESTNS and it has passed this test.

    12 months ago our original domain controller went down do we had a backup take over but workstations were still looking for the the old one so when it was back up it was set as a forwarder. Would this cause problems?

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