System Center Monitoring Pack for Active Directory

The Monitoring Pack for Active Directory (AD) provides both proactive and reactive monitoring of your Active Directory deployment. It monitors events that various Active Directory components and subsystems place in the Application, System, and Service event logs. It also monitors the overall health of the Active Directory system and provides alerts for critical performance issues.
The monitoring that this monitoring pack provides includes monitoring of domain controllers and monitoring of health from the perspective of clients that use Active Directory resources. To monitor domain controllers, ADMP provides a predefined, ready-to-run set of processing rules, monitoring scripts, and reports that are designed specifically to monitor the performance and availability of domain controllers.
Because client computers in your Active Directory environment can experience connectivity and service issues even when domain controllers appear to be operating correctly, ADMP includes the Active Directory Client Management Pack, which can help you identify such issues.
The Active Directory Client Management Pack monitors the services that domain controllers provide. It provides information—in addition to the information that is collected directly on the domain controllers—about whether domain controllers are available by running transactions, such as Lightweight Directory Access Protocol (LDAP) binds and pings, against the directory service.
Get System Center Monitoring Pack for Active Directory and give it a try to fully assess its capabilities!