6527
Microsoft-Windows-DNS-Server-Service
DNS Server
Zone somedomain.local expired before it could obtain a successful zone transfer or update from a master server acting as its source for the zone. The zone has been shut down.
This event may be logged when none of the DNS Servers listed for the zone in question can be reached, and the zone will be shut down (disabled).
Make sure the remote DNS servers are reachable and allow zone transfers, or see the additional link for more troubleshooting steps.