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FWP_E_TOO_MANY_CALLOUTS
FWP_E_TOO_MANY_CALLOUTS indicates that WFP cannot register another callout because the system limit has been reached. This is usually an application or driver lifecycle problem, not evidence that one network connection failed.
What to investigate
- Check that a driver unregisters callouts during unload and does not register a new callout for each policy refresh.
- Detect duplicate registrations caused by restart, upgrade, or recovery paths.
- Inspect installed filtering products, because multiple security products can all register WFP callouts.
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