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Event ID: 6525 Source: DNS

Source
Level
Description
Zone transfer request for secondary zone <zone name> refused by master server at <ip address>. Check the zone at the master server <ip address> to verify that zone transfer is enabled to this server. To do so, use the DNS console, and select master server  <ip address> as the applicable server, then in secondary zone <domain> Properties, view the settings on the Zone Transfers tab. Based on the settings you choose, make any configuration adjustments there (or possibly in the Name Servers tab) so that a zone transfer can be made to this server.
Comments
 
See ME915022 for information about this event.
I have found on Windows 2000 Server that the secondary server is not allowed to update because of the secondary serverís IP number order on the NIC card, if multiple IP numbers are assigned. If the Primary zone is set to allow zone transfers "To any server", the IP order on the secondary servers does not affect zone transfers.
As per Microsoft: "The zone transfer request initiated by the master DNS server was refused by the primary server". See MSW2KDB for details on this issue.
This may occur due to the DNS zone transfer throttling mechanism. See ME291016 for more details.

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