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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 of FWP_E_INCOMPATIBLE_CIPHER_TRANSFORM
FWP_E_INCOMPATIBLE_CIPHER_TRANSFORM has the HRESULT value 0x8032003A. AllStat records the condition as “The IPsec cipher transform is not compatible with the policy.”. For FWP_E_INCOMPATIBLE_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_INCOMPATIBLE_CIPHER_TRANSFORM
- Record the exact COM method or Windows API, its input object, the calling thread, and the full 0x8032003A 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_INCOMPATIBLE_CIPHER_TRANSFORM or the fwp / incompatible / cipher / transform operation.
- For FWP_E_INCOMPATIBLE_CIPHER_TRANSFORM, compare the failing machine with a working one at the same configuration boundary: component version, policy, registration, identity, and target resource.
Retry and recovery for FWP_E_INCOMPATIBLE_CIPHER_TRANSFORM
Retry FWP_E_INCOMPATIBLE_CIPHER_TRANSFORM only when the owning API documents a transient state or after the condition described as “The IPsec cipher transform is not compatible with the policy.” has changed. For FWP_E_INCOMPATIBLE_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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