In this post, you’ll learn more about the Error ERROR_FLT_NO_WAITER_FOR_REPLY – 0x801F0020 that is returned when working with the COM-based APIs in Win32
Win32 COM Error
ERROR_FLT_NO_WAITER_FOR_REPLY – 0x801F0020
Win32 COM Error Error Description
No waiter is present for the filter’s reply to this message.