KFHD a part of Windows that has been abandoned and discouraged by Microsoft and is rarely used. A list of known software that use this Windows feature is included at the end of the article. The Data usage report isn’t relying on a KFHD, however their use also breaks some parts of WFPCD because a KFHD will get an exclusive lock in the network communications stack.Ĭonsidering that Kernel Filter-Hook Drivers have been discouraged from use for almost a decade, I recommend that you uninstall any software that relies on the KFHD. However, if we take a look at the known limitations of the Filter-Hook Driver system in Windows, we can have a pretty good guess “Only a single filter-hook driver can be installed on the operating system and used by the IP filter driver”. The Windows Kernel isn’t open-source so I can’t verify what is going on. However, KFHDs where never formally deprecated and are supported up to and including Windows 10.

This type of driver was discouraged from future use when Windows Vista was released in favor of the then new Windows Filtering Platform Callout Drivers ( WFPCD). Something was amiss.Īfter some digging around, I found out that this problem occurs when any program uses a legacy Kernel Filter-Hook Drivers ( KFHD) in Windows.

The report didn’t show the app I was curious about, but did instead include software that I’d uninstalled at least a week earlier. I was curious about how much data an app had used in Windows, and opened up the Data usage report to have a look. The feature, hidden in the Network section of the Settings app, can stop updating the ledger over data usage when you’ve got legacy network and security products installed. Windows 10 has a neat data usage report that can help you keep track of how much data your apps on Windows 10 powered devices consume.

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