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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 interpretation of FWP_E_INVALID_PARAMETER
FWP_E_INVALID_PARAMETER has the HRESULT value 0x80320035. AllStat records the condition as “The parameter is incorrect.”. For FWP_E_INVALID_PARAMETER, 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_PARAMETER
- Record the exact COM method or Windows API, its input object, the calling thread, and the full 0x80320035 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_PARAMETER or the fwp / parameter operation.
- Preserve the first failure in the call chain; a later HRESULT can describe cleanup rather than the original fwp / parameter condition.
Retry and recovery for FWP_E_INVALID_PARAMETER
Retry FWP_E_INVALID_PARAMETER only when the owning API documents a transient state or after the condition described as “The parameter is incorrect.” has changed. For FWP_E_INVALID_PARAMETER, 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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