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Event ID: 6523 Source: DNS

Source
Level
Description
Zone <zone> failed zone refresh check. Unable to connect to master DNS server at <IP address> to receive zone transfer. Check that the zone contains correct IP address for the master server or if network failure has occurred. For more information see "To update the master server for a secondary zone" in the online Help. If available you can specify more than one master server in the list for this zone.
Comments
 
This event appears when the secondary zone is configured to pull updates from an incorrect master (likely the primary zone) server. On the zone properties, modify the zone to transfer from the correct server. On the master server, verify you have zone transfers allowed to the server logging these errors.

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