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FWP_E_TOO_MANY_SUBLAYERS
FWP_E_TOO_MANY_SUBLAYERS means WFP cannot create another sublayer because the platform limit has been reached. It generally indicates leaked or unnecessarily fragmented policy configuration.
What to investigate
- Create a stable, reusable sublayer per policy provider rather than a new sublayer per rule or per process start.
- Remove application-owned sublayers during uninstall and upgrade, after deleting dependent filters.
- Inspect provider ownership before deleting anything; third-party firewall policy may share the engine.
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