microsoft / microsoft/Windows-driver-samples

[help] fastfat testing

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#821 7 comments 0 reactions 1 assignee View on GitHub

@msscolee is already working on this.

Since Nov 11, 2025.

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Description

After deleting C:/Windows/System32/Drivers/fastfat.sys, KDNET does not work:

PS C:\Program Files (x86)\Windows Kits\10\Debuggers\x64> .\kdnet.exe w11 50030

Failed to enable kernel debugging.  Is secure boot enabled?
Attempting to enable kernel debugging on the {default} OS installation.
Failed to enable debugging on the {default} OS.  Is secure boot enabled?

I am testing on Windows VM (Windows 11) using VMWare Workstation with Secure Boot disabled. After enabling Secure Boot, KDNET asks to disable it.

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