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STATUS_FWP_INVALID_CIPHER_TRANSFORM
The IPsec cipher transform is not valid
Cipher transforms define encryption algorithms and related parameters. This status means the transform object itself is invalid for WFP/IPsec policy installation.
Compare the cipher transform requested by the filter or IPsec policy with transforms supported by the selected proposal. Record the exact transform identifier rather than only the policy display name.
What to inspect
- Check cipher algorithm, key length, and transform type.
- Confirm the transform is valid for ESP, AH, or the intended IPsec path.
- Do not fix this by changing firewall rules; fix the IPsec transform policy.
References for STATUS_FWP_INVALID_CIPHER_TRANSFORM
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