We just published this Hotfix and KB article so if you’re seeing issues with the Active Directory Connector when DCs switch over or a DC is restored from backup then this one’s for you:
This article describes a hotfix package that resolves an issue in Microsoft System Center Service Manager 2010 Service Pack 1 (SP1).
In this scenario, an organization has multiple active directory domain controllers (DCs) that replicate with one another. The Active Directory Connector may not function correctly when DC switchover occurs. In this scenario, the connector can potentially miss some updates that are made on the domain controller.
Additionally, the connector may have the same problem for a single domain controller that is restored from a backup…
For all the details and a download link please see the following article: