Windows Defender Firewall may not start, bfe.dll errors in the event logs, BFE\Parameters\Policy\Persistent\Filter's size is 250 MB - 800 MB

We're having an issue where some computers' (especially laptops) take an inordinate amount of time to start. The HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\BFE\Parameters\Policy\Persistent\Filter registry key is in excess of 250 MB. The event logs show bfe.dll crashing.

Do you know of anything that would case the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\BFE\Parameters\Policy\Persistent\Filter registry key to grow so much?
Thanks!

I answered my own question. I found where two security products were competing for access and control of the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\BFE\Parameters\Policy\Persistent\Filter registry key.

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Last updated April 19, 2025 Views 906 Applies to: