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| FWP_E_CALLOUT_NOTIFICATION_FAILED | FWP_E_INVALID_CIPHER_TRANSFORM |
FWP_E_INVALID_AUTH_TRANSFORM
FWP_E_INVALID_AUTH_TRANSFORM means an IPsec authentication transform is malformed or contains unsupported values. This is distinct from a peer refusing an otherwise valid proposal.
What to verify for FWP_E_INVALID_AUTH_TRANSFORM
- Check the transform identifier, key material requirements, and structure initialization.
- Make sure the transform is legal for the chosen IPsec policy and tunnel or transport mode.
- Review the final policy after any conversion from higher-level configuration into WFP structures.
Microsoft: capture IPsec events with netsh wfp
Diagnostic interpretation of FWP_E_INVALID_AUTH_TRANSFORM
FWP_E_INVALID_AUTH_TRANSFORM has the HRESULT value 0x80320038. AllStat records the condition as “The IPsec authentication transform is not valid.”. For FWP_E_INVALID_AUTH_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_INVALID_AUTH_TRANSFORM
- Record the exact COM method or Windows API, its input object, the calling thread, and the full 0x80320038 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_INVALID_AUTH_TRANSFORM or the fwp / auth / transform operation.
- Preserve the first failure in the call chain; a later HRESULT can describe cleanup rather than the original fwp / auth / transform condition.
Retry and recovery for FWP_E_INVALID_AUTH_TRANSFORM
Retry FWP_E_INVALID_AUTH_TRANSFORM only when the owning API documents a transient state or after the condition described as “The IPsec authentication transform is not valid.” has changed. For FWP_E_INVALID_AUTH_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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