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FWP_E_CALLOUT_NOT_FOUND
FWP_E_CALLOUT_NOT_FOUND means that Windows Filtering Platform cannot find the callout object identified by the supplied key or runtime identifier. A callout is the WFP object that connects a policy filter to code that can perform deeper packet or stream inspection; this error is therefore different from a normal packet block or network-connect failure.
Where to look first
- Record whether the failing operation uses a callout GUID, a run-time ID, or a filter action that refers to a callout.
- Enumerate the registered WFP callouts and filters immediately before the failing operation; do not assume that an ID saved from a previous boot or session is still valid.
- Check installation and teardown ordering. A filter should reference a callout only after the callout was registered with the filter engine and added to WFP.
Typical correction
Repair the callout registration or recreate the dependent filter from the intended declarative configuration. Do not substitute another callout or silently downgrade the rule to permit traffic: the missing callout can be part of the product’s security decision.
Microsoft: WFP error codes · Microsoft: WFP layers, filters, and callouts · Microsoft: FwpmFilterAdd0 callout order
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