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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 discriminator: Test the IPsec proposal with a known-good minimal transform set, then add transforms incrementally. Failure only after a particular combination identifies proposal incompatibility rather than a missing provider or tunnel endpoint.
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