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The Volume Shadow Copy Service supports creating single point-in-time shadow copies of single or multiple volumes on computers that are running Windows Server 2003, Windows Server 2008, or Windows Server 2008 R2. These APIs back up and restore the domain controller system state. Use an Active Directory-aware backup and restoration utility that uses Microsoft Volume Shadow Copy Service APIs. The backup that is restored should originate from the same operating system installation and from the same physical or virtual computer that is being restored. These APIs non-authoritatively or authoritatively restore a system state backup. Use an Active Directory-aware backup and restoration utility that uses Microsoft-provided and Microsoft-tested APIs. The following are supported methods that you can use to roll back the contents of Active Directory: Or, you may have to roll back elements of a domain controller's host operating system, including Active Directory, to a known good point.

Over a domain controller's life cycle, you may have to restore, or 'roll back,' the contents of the Active Directory database to a known good point in time. Supported methods to back up Active Directory on domain controllers that are running Windows Server 2003 or later versions of Windows Server This is one of the scenarios that is covered in Virtualized Domain Controller Deployment and Configuration. By using the new Invocation ID, the database instance can safely re-enter replication in the forest. In Active Directory, Directory Services reacts as if the domain controller was restored from a backup. This allows the virtual guest to detect the disk volumes that have a new ID, and respond to the new GenID.

Windows Server 2012 adds support for Hyper-Visor Generation ID (GenID). Supported methods to back up Active Directory on domain controllers that are running Windows Server 2012 and later versions

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The following topics discuss how to detect and recover from a USN rollback in a Windows Server-based domain controller. If this situation occurred because of an improper or unintended restore, forcibly demote the DC. The most probable cause of this situation is the improper restore of Active Directory Domain Services on the local domain controller. To determine if this misconfiguration exists, query this event ID using or contact your Microsoft product support. Specifically the consistency of users, computers and trust relationships, their passwords, security groups, security group memberships and other Active Directory Domain Services configuration data may vary, affecting the ability to log on, find objects of interest and perform other critical operations. If not resolved immediately, this scenario will result in inconsistencies in the Active Directory Domain Services databases of this source DC and one or more direct and transitive replication partners. Source: Microsoft-Windows-ActiveDirectory_DomainServiceĭuring an Active Directory Domain Services replication request, the local domain controller (DC) identified a remote DC which has received replication data from the local DC using already-acknowledged USN tracking numbers.īecause the remote DC believes it is has a more up-to-date Active Directory Domain Services database than the local DC, the remote DC will not apply future changes to its copy of the Active Directory Domain Services database or replicate them to its direct and transitive replication partners that originate from this local DC. Example of Event 2095 log entry Log Name: Service The text of the event message directs administrators to this article to learn about recovery options. Because replication partners believe that they have an up-to-date copy of the Active Directory database, monitoring and troubleshooting tools such as Repadmin.exe do not report any replication errors.ĭomain Controllers log Directory Services Event 2095 in the Directory Services event log when they detect a USN rollback. When a USN rollback occurs, modifications to objects and attributes that occur on one domain controller do not replicate to other domain controllers in the forest. A USN rollback occurs when an older version of an Active Directory database is incorrectly restored or pasted into place.

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This article describes a silent Active Directory replication failure that is caused by an update sequence number (USN) rollback. If you're looking for help with a problem, please ask the Microsoft Community. This article is intended for only technical support agents and IT professionals.

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