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Event ID: 6534 Source: DNS

Failed transfer of zone <zone> from DNS server at <IP address>. The DNS server at <IP address> aborted or failed to complete transfer of the zone. Check the DNS server at <IP address> and insure it is properly functioning and authoritative for zone <zone>.
As per Microsoft: "The zone transfer failed to take place because the expiration time in the SOA record located on the primary server (the source of the zone information for a secondary server) expired. The primary server might be down". See MSW2KDB for more details.

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