| Previous | Next |
| FWP_E_PROVIDER_CONTEXT_MISMATCH | FWP_E_TOO_MANY_SUBLAYERS |
FWP_E_INVALID_PARAMETER
FWP_E_INVALID_PARAMETER is a specific WFP validation result. For example, Microsoft documents it for invalid Unicode strings and for certain unsupported condition sets passed to FwpmIPsecTunnelAdd0.
How to diagnose it for FWP_E_INVALID_PARAMETER
- Log the full input structure, including nested conditions and strings, before the API call.
- Validate strings for printable, properly terminated Unicode content.
- For tunnel policy, verify the documented flags and permitted local/remote address conditions.
Diagnostic discriminator: Preserve the complete WFP input structure and identify the field rejected by the API. A malformed string or unsupported condition set should be corrected at the request boundary, not diagnosed as engine unavailability.
Looking for a different code? Search another status or error code.