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FWP_E_INCOMPATIBLE_CIPHER_TRANSFORM
FWP_E_INCOMPATIBLE_CIPHER_TRANSFORM means the cipher transform may be valid by itself, but it cannot be used with the selected IPsec policy.
What to check for FWP_E_INCOMPATIBLE_CIPHER_TRANSFORM
- Check policy mode, authentication method, and the complete transform suite together.
- Align local policy with the cryptographic proposal expected by the peer.
- Review IKE events after correcting local policy to see whether the remaining failure is negotiation-related.
Microsoft: capture IPsec events with netsh wfp
Microsoft: IKEEXT service guidance
Diagnostic interpretation
This result has the HRESULT value 0x8032003A. AllStat records the condition as “The IPsec cipher transform is not compatible with the policy.”.
Evidence to capture
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions this result or the fwp / incompatible / cipher / transform operation.
- compare the failing machine with a working one at the same configuration boundary: component version, policy, registration, identity, and target resource.
Retry and recovery
” has changed.
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