Windows Server shows PCR7 configuration as "Binding not possible"
This article introduces the Binding not possible issue in msinfo32 and the cause of the issue. This applies to both Windows clients and Windows Server.
PCR7 Configuration in msinfo32
Consider the following scenario:
- Windows Server is installed on a secure boot-enabled platform.
- You enable Trusted Platform Module (TPM) 2.0 in Unified Extensible Firmware Interface (UEFI).
- You turn on BitLocker.
- You install chipset drivers and update the latest Microsoft Monthly Rollup.
- You also run tpm.msc to make sure that the TPM status is fine. The status displays The TPM is ready for use.
In this scenario, when you run msinfo32 to check the PCR7 Configuration, it's displayed as Binding not possible.
Cause of the unexpected message
BitLocker only accepts the Microsoft Windows PCA 2011 certificate to be used to sign early boot components that will be validated during boot. Any other signature present on boot code will cause BitLocker to use TPM profile 0, 2, 4, 11 instead of 7, 11. In some cases, the binaries are signed with UEFI CA 2011 certificate, which will prevent you from binding BitLocker to PCR7.
UEFI CA can be used to sign third-party applications, Option ROMs or even third-party boot loaders that can load malicious (UEFI CA signed) code. In this case, BitLocker switches to PCR 0, 2, 4, 11. In the cases of PCR 0,2,4,11, Windows measures exact binary hashes instead of the CA certificate.
Windows is secure regardless of using TPM profile 0, 2, 4, 11 or profile 7, 11.
To check whether your device meets the requirements:
Open an elevated command prompt, and run the
In System Summary, verify that BIOS Mode is UEFI, and PCR7 Configuration is Bound.
Open an elevated PowerShell command prompt, and run the following command:
Verify that the value of True is returned.
Run the following PowerShell command:
manage-bde -protectors -get $env:systemdrive
Verify that the drive is protected by PCR 7.
PS C:\Windows\system32> manage-bde -protectors -get $env:systemdrive BitLocker Drive Encryption: Configuration Tool version 10.0.22526 Copyright (C) 2013 Microsoft Corporation. All rights reserved. Volume C: [OSDisk] All Key Protectors TPM: ID: <GUID> PCR Validation Profile: 7, 11 (Uses Secure Boot for integrity validation)