Fwpkclnt.sys Driver-irql-not-less-or-equal Windows 10 Jun 2026

If you have landed on this page because your PC crashed with the message "What Failed: fwpkclnt.sys" alongside the IRQL error, don’t panic. This article will explain exactly what this file is, what causes the crash, and provide to resolve the "fwpkclnt.sys driver-irql-not-less-or-equal" error in Windows 10 permanently.

As mentioned earlier, third-party security software is the prime suspect in fwpkclnt.sys crashes. These programs hook deep into the network stack, and if their drivers are buggy, they cause crashes. fwpkclnt.sys driver-irql-not-less-or-equal windows 10