The “AD Domain Availability Health Degraded” message typically indicates that there are issues with the availability of the Active Directory (AD) domain. This could be due to a variety of reasons, such as:
- Offline or problematic domain controllers: If one or more domain controllers are offline or experiencing issues, this can affect the overall availability of the domain.
- Performance issues: If the domain controllers are operating beyond normal performance thresholds, this could also lead to availability issues. For instance, high CPU utilization might indicate that the servers are being overloaded with traffic.