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FWP_E_INVALID_CIPHER_TRANSFORM
FWP_E_INVALID_CIPHER_TRANSFORM means a configured IPsec encryption transform is syntactically or structurally invalid for WFP.
What to verify for FWP_E_INVALID_CIPHER_TRANSFORM
- 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.
Microsoft: capture IPsec events with netsh wfp
Diagnostic interpretation of FWP_E_INVALID_CIPHER_TRANSFORM
FWP_E_INVALID_CIPHER_TRANSFORM has the HRESULT value 0x80320039. AllStat records the condition as “The IPsec cipher transform is not valid.”. For FWP_E_INVALID_CIPHER_TRANSFORM, in practice, interpret that wording at the boundary owned by Windows Filtering Platform or IPsec policy state, rather than treating the value as a generic Windows message.
Evidence to capture for FWP_E_INVALID_CIPHER_TRANSFORM
- Record the exact COM method or Windows API, its input object, the calling thread, and the full 0x80320039 value before a wrapper converts it to an exception or Boolean result.
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions FWP_E_INVALID_CIPHER_TRANSFORM or the fwp / cipher / transform operation.
- Preserve the first failure in the call chain; a later HRESULT can describe cleanup rather than the original fwp / cipher / transform condition.
Retry and recovery for FWP_E_INVALID_CIPHER_TRANSFORM
Retry FWP_E_INVALID_CIPHER_TRANSFORM only when the owning API documents a transient state or after the condition described as “The IPsec cipher transform is not valid.” has changed. For FWP_E_INVALID_CIPHER_TRANSFORM, configuration, policy, format, and authorization failures normally require correction first; an immediate loop can hide the original call site and add secondary errors.
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