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windows/device-security/tpm/trusted-platform-module-services-group-policy-settings.md
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--- ---
title: TPM Group Policy settings (Windows 10) title: TPM Group Policy settings (Windows 10)
description: This topic for the IT professional describes the Trusted Platform Module (TPM) Services that can be controlled centrally by using Group Policy settings. description: This topic describes the Trusted Platform Module (TPM) Services that can be controlled centrally by using Group Policy settings.
ms.assetid: 54ff1c1e-a210-4074-a44e-58fee26e4dbd ms.assetid: 54ff1c1e-a210-4074-a44e-58fee26e4dbd
ms.prod: w10 ms.prod: w10
ms.mktglfcycl: deploy ms.mktglfcycl: deploy
@ -15,20 +15,25 @@ author: brianlic-msft
- Windows 10 - Windows 10
- Windows Server 2016 - Windows Server 2016
This topic for the IT professional describes the Trusted Platform Module (TPM) Services that can be controlled centrally by using Group Policy settings. This topic describes the Trusted Platform Module (TPM) Services that can be controlled centrally by using Group Policy settings.
The TPM Services Group Policy settings are located at: The Group Policy settings for TPM services are located at:
**Computer Configuration\\Administrative Templates\\System\\Trusted Platform Module Services\\** **Computer Configuration\\Administrative Templates\\System\\Trusted Platform Module Services\\**
### Configure the system to use legacy Dictionary Attack Prevention Parameters setting for TPM 2.0 ## Configure the system to use legacy Dictionary Attack Prevention Parameters setting for TPM 2.0
Introduced in Windows 10, version 1703, this policy setting configures the TPM to use the Dictionary Attack Prevention Parameters (lockout threshold and recovery time) to the values that were used for Windows 10 Version 1607 and below. Setting this policy will take effect only if: a) the TPM was originally prepared using a version of Windows after Windows 10 Version 1607, and b) the System has a TPM 2.0. Introduced in Windows 10, version 1703, this policy setting configures the TPM to use the Dictionary Attack Prevention Parameters (lockout threshold and recovery time) to the values that were used for Windows 10 Version 1607 and below.
> [!IMPORTANT]
> Setting this policy will take effect only if:
- The TPM was originally prepared using a version of Windows after Windows 10 Version 1607
- The system has a TPM 2.0.
Note that enabling this policy will only take effect after the TPM maintenance task runs (which typically happens after a system restart). Once this policy has been enabled on a system and has taken effect (after a system restart), disabling it will have no impact and the system's TPM will remain configured using the legacy Dictionary Attack Prevention parameters, regardless of the value of this group policy. The only way for the disabled setting of this policy to take effect on a system where it was once enabled is to: Note that enabling this policy will only take effect after the TPM maintenance task runs (which typically happens after a system restart). Once this policy has been enabled on a system and has taken effect (after a system restart), disabling it will have no impact and the system's TPM will remain configured using the legacy Dictionary Attack Prevention parameters, regardless of the value of this group policy. The only way for the disabled setting of this policy to take effect on a system where it was once enabled is to:
a) disable it from group policy and b) clear the TPM on the system. a) disable it from group policy and b) clear the TPM on the system.
**The following Group Policy settings were introduced in Window 10:** The following Group Policy settings were introduced in Window 10:
### Configure the list of blocked TPM commands ### Configure the list of blocked TPM commands