| Previous | Next |
| STATUS_FWP_INVALID_AUTH_TRANSFORM | STATUS_FWP_INCOMPATIBLE_CIPHER_TRANSFORM |
STATUS_FWP_INVALID_CIPHER_TRANSFORM
The IPsec cipher transform is not valid
These status values come from the Windows Filtering Platform path. For STATUS_FWP_INVALID_CIPHER_TRANSFORM, wFP classifies traffic through layers, filters, provider contexts, sublayers, and callouts; IPsec policy is also configured through WFP at IKE/AuthIP-related layers.
Cipher transforms define encryption algorithms and related parameters. This status means the transform object itself is invalid for WFP/IPsec policy installation.
For STATUS_FWP_INVALID_CIPHER_TRANSFORM, when this appears during IPsec or AuthIP negotiation, compare the Main Mode, Quick Mode, Extended Mode, transform, tunnel endpoint, DNS name, and authentication-method policy actually installed in WFP.
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
- Microsoft Open Specifications: NTSTATUS values
- Microsoft: WFP error codes
- Microsoft: IPsec configuration through WFP
Looking for a different code? Search another status or error code.