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Event ID: 6522 Source: DNS

Source
Level
Description
A more recent version, version <version number> of zone <DNS zone name> was found at DNS server at <ip address>. Zone transfer is in progress.
Comments
 
This is a self-explanatory event. If your DNS server is of "Standard Secondary" type, it requests the new version of the authoritative zone from the Master DNS server. This can be inititated in two ways:
1. Your DNS server is checking periodically the version of the SOA record on the primary and if it is found larger than the last time, the server requests a zone transfer.
2. Instantly after a zone change, if you use DNS notify on the primary server.

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