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ITsVISTA KB-Link: KB2409336

“Unable to cast object of type ‘System.String’ to type ‘Microsoft.Group.Policy.Reporting.Extensions.Registry.RegistryValue’.” error message when you try to generate a report for a GPO

Consider the following scenario:

  • You have a computer that is running one of the following operating systems:
    • Windows Vista
    • Windows Server 2008
    • Windows 7
    • Windows Server 2008 R2
  • You use the Group Policy Management Console (GPMC) to connect to a domain controller from the computer.
  • You select a Group Policy object (GPO), and then you disable the Windows Firewall:
    Allow Logging Group Policy setting in the following path:

    Computer Configuration\Administrative Templates\Network\Network Connections\Windows Firewall\Domain Profile

  • You try to generate a report for the GPO in GPMC.

In this scenario, you receive the following error message:

An error occurred while generating report:
Unable to cast object of type ‘System.String’ to type ‘Microsoft.Group.Policy.Reporting.Extensions.Registry.RegistryValue’.

Note: You can use either of the following methods to generate a report for a GPO in the GPMC MMC snap-in:

  • Method 1: Select the Group Policy object, and then click the Settings tab in the panel on the right side.
  • Method 2: Run the Group Policy Results Wizard.
There is a download that resolves this issue. See Hotfixes for details.
32-bit Download: Contact Microsoft
64-Bit Download: Contact Microsoft

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2409336.

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