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FWP_E_FILTER_NOT_FOUND
FWP_E_FILTER_NOT_FOUND means that the target WFP filter no longer exists. It often appears when a management tool retains a stale filter ID, when a dynamic session was closed, or when another installer, policy component, or administrator has replaced the rule set.
Do not treat the ID as durable state
WFP assigns a runtime ID when a filter is added. A product should keep a stable policy identity such as its own provider GUID and filter key, then enumerate or query the current engine state before changing or deleting a rule. A filter may be persistent, boot-time, or session-owned, and those lifetimes have different cleanup behavior.
Recovery path
- Identify the provider, layer, sublayer, filter key, and intended action from the configuration that created the rule.
- Confirm whether the filter was deliberately removed, automatically removed with a dynamic session, or superseded by a reinstall.
- Reconcile the desired rule set atomically instead of retrying a delete or update against a stale identifier.
Microsoft: WFP error codes · Microsoft: FwpmFilterAdd0 · Microsoft: FWPM_FILTER0 lifetime and identifiers
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