| Event Id | 6521 |
| Source | DNS |
| Description | Zone %1 is synchronization with version %2 of the zone as provided from the master server at %3. |
| Event Information | "According To Microsoft:" Explanation: A secondary DNS server has requested a zone transfer from its primary server. The zone transfer did not take place because the databases for both servers are already in sync. In other words, the serial numbers for the SOA records in both databases are the same. |
| Reference Links | Microsoft product: Windows Operating System Version: 5.0 Event Source: DNS Event ID: 6521 |
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