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You cannot perform a system state restore in the Directory Service Restore mode on a read-only domain controller that is running Windows Server 2008 R2 if DFS Replication is used to replicate the SYSVOL folder
Article ID: 976655 - View products that this article applies to.
Consider the following scenario:
Note A read-only domain controller is configured when you select the Read-only domain controller (RODC) check box in the Active Directory Domain Services Installation Wizard.
Access is denied
This issue occurs because a DFS Replication-related filter driver (DfsrRo.sys) is incorrectly loaded when the computer is in the Directory Service Restore mode. This behavior blocks the restore process.
Hotfix informationA supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
PrerequisitesTo apply this hotfix, your computer must be running Windows Server 2008 R2.
Restart requirementYou must restart the computer after you apply this hotfix.
Hotfix replacement informationThis hotfix does not replace a previously released hotfix.
File informationThe English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.
Windows Server 2008 R2 file information notes
For all supported x64-based versions of Windows Server 2008 R2
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Workaround for Windows Server 2008 R2To work around this issue, follow these steps:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
In Windows Server 2008 R2, the DFS Replication service introduces a "read-only replicated folders" feature. This feature is used for the SYSVOL replicated folder on a read-only domain controller. A read-only filter driver prevents the read-only replicated folder from being changed except when the DFS Replication service tries to make a change. Therefore, when you perform a system state restore on a read-only domain controller that is running Windows Server 2008 R2, the restore operation fails.
When you perform a system state restore in the Directory Services Restore mode, the DFS Replication read-only filter driver is still loaded because the filter driver is loaded as a system boot driver. Additionally, the filter driver is loaded regardless of whether the service has started or not. Therefore, the filter driver prevents the backup application from restoring the contents of the SYSVOL replicated folder.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: -
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates
Additional file information
Additional files for all supported x64-based versions of Windows Server 2008 R2
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For more information about the release notes for Windows Server 2008 R2, visit the following Microsoft Web site.
For more information about how to use Windows Server Backup program to back up system state, visit the following Microsoft Web site.
For more information about how to use Windows Server Backup program to restore system state, visit the following Microsoft Web site.