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FWP_E_INVALID_INTERVAL
FWP_E_INVALID_INTERVAL means a time interval supplied to WFP does not satisfy the requirements of the API or policy object that consumes it.
What to check for FWP_E_INVALID_INTERVAL
- Verify the documented unit and representation for the interval field instead of assuming seconds or milliseconds.
- Reject negative, reversed, overflowed, or unsupported interval values before making the WFP call.
- When converting from another time type, preserve precision and validate the resulting range.
Diagnostic interpretation of FWP_E_INVALID_INTERVAL
FWP_E_INVALID_INTERVAL has the HRESULT value 0x80320021. AllStat records the condition as “The time interval is not valid.”. For FWP_E_INVALID_INTERVAL, 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_INTERVAL
- Record the exact COM method or Windows API, its input object, the calling thread, and the full 0x80320021 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_INTERVAL or the fwp / interval operation.
- Reproduce FWP_E_INVALID_INTERVAL with the smallest valid input and note whether the result changes with identity, architecture, service state, or target object.
Retry and recovery for FWP_E_INVALID_INTERVAL
Retry FWP_E_INVALID_INTERVAL only when the owning API documents a transient state or after the condition described as “The time interval is not valid.” has changed. For FWP_E_INVALID_INTERVAL, 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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