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Correct Cred Guard CI File Rule for KD_KMCI. The correction should be as follows: The line: <Deny ID="ID_DENY_KD" FriendlyName="kd.exe" FileName="kd.Exe" MinimumFileVersion = "65535.65535.65535.65535" /> Should be essentially duplicated with another with a slightly different ID. This is because the same rule is used in the “user mode” and the “kernel mode” sections in the policy, so it needs separate IDs. SO for example add this: <Deny ID="ID_DENY_KD_KMCI" FriendlyName="kd.exe" FileName="kd.Exe" MinimumFileVersion = "65535.65535.65535.65535" /> (and leave the original line) Then in this section: <SigningScenario Value="131" ID="ID_SIGNINGSCENARIO_DRIVERS_1" FriendlyName="Driver Signing Scenarios"> <ProductSigners> <FileRulesRef> <FileRuleRef RuleID="ID_DENY_KD" /> </FileRulesRef> </ProductSigners> Update the ID like this: <SigningScenario Value="131" ID="ID_SIGNINGSCENARIO_DRIVERS_1" FriendlyName="Driver Signing Scenarios"> <ProductSigners> <FileRulesRef> <FileRuleRef RuleID="ID_DENY_KD_KMCI" /> </FileRulesRef> </ProductSigners>