The DNS server encountered invalid class token 'name' in zone file filename at line number. Although the DNS server continues to load, ignoring this resource record (RR), it is recommended that you either correct the class of the RR to use the Internet (IN) class or remove the resource record from the zone file. The DNS server supports only the Internet (IN) class in RRs.
Tokens are used to shorten and speed up the execution of program files. For example, the @ symbol can be used in place of the domain name. Improper use of tokens generally creates syntax errors in the database file. When a text line is commented out, any tokens it contains must be enclosed in quotes, or DNS will attempt to use them
Check the specified file for the incorrect token: 1. In Windows Explorer, go to the Systemroot\System32\Dns folder. 2. Double-click the specified file, and then select Notepad to open it. 3. Edit the specified line to correct the use of the token. 4. Save and close the database file. 5. Stop and restart DNS.