FWP_E_KEY_DICTATOR_ALREADY_REGISTERED: meaning and diagnosis

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A key manager capable of IPsec key dictation is already registered.

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FWP_E_L2_DRIVER_NOT_READY	FWP_E_KEY_DICTATION_INVALID_KEYING_MATERIAL

FWP_E_KEY_DICTATOR_ALREADY_REGISTERED

FWP_E_KEY_DICTATOR_ALREADY_REGISTERED means another key manager with key-dictation capability is already registered. WFP allows only one such authority for the relevant role.

What to investigate for FWP_E_KEY_DICTATOR_ALREADY_REGISTERED

Check for a duplicate driver instance after upgrade, restart, or crash recovery.
Ensure registration is performed once per system role and is paired with reliable deregistration.
Identify any competing IPsec or endpoint-security component before changing configuration.

Microsoft: WFP error codes

Microsoft: WFP architecture

Microsoft: WFP object model

Diagnostic discriminator: Identify the component already registered for key dictation before retrying registration. WFP permits only one authority for the role, so the key issue is ownership/lifecycle rather than key-material validity.

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