
Note More information on troubleshooting volume activation can be found in the Volume Activation 2.0 Deployment Guide. If you must use Basic authentication, type the following URLs in the Proxy’s exception list: While this is not a default configuration for Microsoft Internet Security and Acceleration (ISA) Server, it is a valid configuration for many proxied networks.

Microsoft KnowledgeBase article 921471, “Activation fails when you try to activate Windows Vista or Windows Longhorn Server over the Internet” () ) describes a situation in which the client attempting activation is behind a proxy server configured to use Basic authentication. If used, the MOM pack automatically collects these events on a configurable, scheduled basis, so that log wrapping is not an issue. Ensure that the KMS event log is configured with sufficient space to manage these events. During normal operation, the KMS machine generates a large number of 12290 events.

KMS machine event log wraps, overwriting events.

Ensure that the KMS machine listening port (by default, port 1688/TCP) is open on the computer’s firewall. Network routers, Windows Firewall with Advanced Security, and non-Microsoft firewalls can prevent access to KMS. (Check for KMS 12290 event log entries.) Check server DNS entries and network connectivity between the client and the server. If a KMS machine cannot be contacted, check the service computer itself to ensure that it is receiving requests from client computers. KMS machine installations should be documented to lessen the chances of inadvertently removing an active KMS machine from the environment. The MOM pack also includes a rule to generate an alert if the KMS count is below a configurable threshold.

Check the current count for the KMS machine by using the Slmgr.vbs with the -dli option. If the number of computers that connect with KMS falls below 25, KMS client computers will not be activated and activated KMS clients are in danger of letting their activation expire. Before moving on, I would like to share the following KMS general troubleshooting guide for you.
