What does HRESULT 0x80320039 (FWP_E_INVALID_CIPHER_TRANSFORM) mean?

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FWP_E_INVALID_CIPHER_TRANSFORM means an IPsec cipher transform supplied to Windows Filtering Platform is invalid or unsupported.

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FWP_E_INVALID_AUTH_TRANSFORM	FWP_E_INCOMPATIBLE_CIPHER_TRANSFORM

FWP_E_INVALID_CIPHER_TRANSFORM

FWP_E_INVALID_CIPHER_TRANSFORM means a configured IPsec encryption transform is syntactically or structurally invalid for WFP.

Check the cipher identifier and any associated key-length or mode settings.
Verify that the transform structure is fully initialized and uses the correct version of the API definition.
Do not confuse this with a remote peer capability mismatch; this HRESULT indicates the local transform itself is invalid.