Set the serial number of the SOA record to be larger than the current value. Even if it is smaller than the current value, the zone file will be uploaded successfully. However, the file will not be reflected to the server. This is a specification that automatically increments the serial value when you are using this service with the method of "Operating DNS with Managed DNS Servers Only" or "Operating a Managed DNS Server as the Primary Name Server." Note that the serial value in this service may be greater than the value in the uploaded zone file when you upload a zone file using a zone file which has been downloaded before for zone update, because of this specification. Refer to "Q. Why is the serial value of SOA records automatically and continually updated?" for more information.