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FWP_E_INVALID_TRANSFORM_COMBINATION
FWP_E_INVALID_TRANSFORM_COMBINATION means individual IPsec transforms were assembled into a combination that WFP does not permit.
What to verify for FWP_E_INVALID_TRANSFORM_COMBINATION
- Validate the entire proposal as a unit, not only each transform independently.
- Remove mutually exclusive transform types and avoid duplicate or conflicting integrity/encryption settings.
- Use a known-good minimal policy first, then add optional transforms one at a time.
Microsoft: capture IPsec events with netsh wfp
Diagnostic interpretation of FWP_E_INVALID_TRANSFORM_COMBINATION
FWP_E_INVALID_TRANSFORM_COMBINATION has the HRESULT value 0x8032003B. AllStat records the condition as “The combination of IPsec transform types is not valid.”. For FWP_E_INVALID_TRANSFORM_COMBINATION, 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_TRANSFORM_COMBINATION
- Record the exact COM method or Windows API, its input object, the calling thread, and the full 0x8032003B 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_TRANSFORM_COMBINATION or the fwp / transform / combination operation.
- Preserve the first failure in the call chain; a later HRESULT can describe cleanup rather than the original fwp / transform / combination condition.
Retry and recovery for FWP_E_INVALID_TRANSFORM_COMBINATION
Retry FWP_E_INVALID_TRANSFORM_COMBINATION only when the owning API documents a transient state or after the condition described as “The combination of IPsec transform types is not valid.” has changed. For FWP_E_INVALID_TRANSFORM_COMBINATION, 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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