Error message when an application or a service tries to query for any deleted objects by using a well-known GUID in a Windows Server 2008 R2-based domain if paged search is used: "0x8007202c Critical extension is unavailable"
An application or a service uses the IDirectorySearch interface to query for deleted objects in a Windows Server 2008 R2-based domain.
The base object for the search is bound by using the well-known GUID for the deleted objects container. This GUID is the GUID_DELETED_OBJECTS_CONTAINER GUID.
Paged search is used to query for deleted objects.
In this scenario, this application returns the first page. However, when this application queries the second page, you receive the following error message:
0x8007202c Critical extension is unavailable
Additionally, the error message has the following details:
Error Code: 8256 Error Text : 00002040: SvcErr: DSID-031401E0, problem 5010 (UNAVAIL_EXTENSION), data 0 Provider : LDAP Provider
When you query for deleted objects on a domain controller that is running Windows Server 2008 R2, the path for the deleted objects container is cached by using the distinguished name. When the client requests the next page of query results, the information that the client passes to the server is associated with the well-known GUID path for the deleted objects container. However, this path does not match the internal distinguished name path that is stored on the server. Therefore, the directory service returns a critical extension error. This behavior causes the server to return only the first page of results to the client.
A 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:
Note 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.
To apply this hotfix, your computer must be running Windows Server 2008 R2 or Windows 7.
You must restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace a previously released hotfix.
The 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 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both of these operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 7
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
For all supported IA-64-based versions of Windows Server 2008 R2
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: -
824684 Description of the standard terminology that is used to describe Microsoft software updates