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When you attempt to perform a system state restore on a Windows Server 2008 R2 read-only domain controller (RODC), the operation fails with the following error:
The recovery of the system state failed [Date - Time].
If you look in the error log you will see lines similar to this:
Error Restoring C:\Windows\SYSVOL\domain\ during write: Error [0x80070005] Access is denied.
On Windows Server 2008 R2 read-only domain controllers the Distributed File System Replication (DFSR) service uses a filter driver to prevent modifications to SYSVOL data. While booted into Directory Services Restore Mode the DFSR filter driver is still protecting the SYSVOL directory, thereby preventing the restore of files to the SYSVOL directory.
To resolve this issue unload the DFSR read-only filter driver before trying to restore the system state on a domain controller. To successfully restore the system state on a read-only domain controller, use these steps:
After a system state restore on a RODC the Sysvol replicated folder will perform an initial synchronization and the contents of Sysvol will be replicated from a writeable domain controller.
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.
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