LaCie 2BIG User Manual page 110

The product must connect to the local network domain, not to a server on the internet.
It's important that the product be assigned a correct and reachable DNS server IP address on the local
network configuration, because joining a domain is based on DNS resolution. Verify the DNS IP on another
computer on the same network as the LaCie product. From this computer, attempt to ping the DNS server.
6. Dashboard: Domain Configuration window settings:
2big NAS User Manual 110