Key Management Service (KMS) activation requires TCP/IP connectivity to, and accessibility from, an organization’s private network so that licenses are not accessible to anyone outside of the organization. By default, KMS hosts and clients use DNS to publish and find the KMS key. Default settings can be used, which require little or no administrative action, or KMS hosts and client computers can be manually configured based on network configuration and security requirements.
KMS activations are valid for 180 days (the activation validity interval). KMS client computers must renew their activation by connecting to the KMS host at least once every 180 days. By default, KMS client computers attempt to renew their activation every 7 days. If KMS activation fails, the client computer retries to reach the host every two hours. After a client computer’s activation is renewed, the activation validity interval begins again.