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STATUS_FWP_INCOMPATIBLE_CIPHER_TRANSFORM
The cipher transform conflicts with the IPsec policy
Unlike an invalid cipher transform, this status means the transform is recognizable but cannot be combined with the selected policy type or proposal.
Compare the cipher transforms offered by each side of the SA with the transform required by the effective policy. The failure is about compatibility between proposals, not packet reachability.
What to inspect
- Compare the cipher transform with authentication and mode settings.
- Check tunnel versus transport mode policy.
- Look for mixed legacy and modern crypto suites in one proposal.
References for STATUS_FWP_INCOMPATIBLE_CIPHER_TRANSFORM
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