During transfer of zone %1 from master at %2, the DNS Server received a CNAME (alias) resource record (RR) for domain node %3 for which other records of that name were already received. When used, the CNAME RR must be the only record for its domain name. The CNAME RR for %3 will be ignored.

Details
Product: Windows Operating System
Event ID: 6531
Source: DNS
Version: 5.0
Symbolic Name: DNS_EVENT_XFR_CNAME_NOT_ALONE
Message: During transfer of zone %1 from master at %2, the DNS Server received a CNAME (alias) resource record (RR) for domain node %3 for which other records of that name were already received. When used, the CNAME RR must be the only record for its domain name. The CNAME RR for %3 will be ignored.
   
Explanation

The two CNAME aliases listed in the error message contain references to each other, creating a CNAME loop. CNAMES allow you to use more than one name to identify a host.

   
User Action

Delete one of the CNAME records from the database file:

1. In DNS Manager, double-click the specified file.
2. Right-click one of the specified CNAME records in the right pane, and click Delete Record.
3. Click DNS on the menu bar, and click Update Server Data Files.

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