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FWPKCLNT.sys missing or corrupt error BSOD

May 18, 2014

DLL ToolDLL Tool downloads and replaces missing or corrupt FWPKCLNT.sys to repiar FWPKCLNT.sys driver_irql_not_less_or_equal blue screen problem for PCs running Microsoft Windows 8.1/8/7/XP/Vista OS, including 32 and 64 bits.

What is FWPKCLNT.sys?

FWPKCLNT.sys file has description FWP/IPsec Kernel-Mode API. This file contains driver. You can find it in the Drivers section of the System Explorer.

IPsec is a standards-based means of aiding the secure transfer of information across IP networks through the use of authentication and encryption that guards against both active and passive attacks. This service is installed by default and the service startup type is Manual.

IPsec operates at the IP layer and is transparent to other operating system services and applications. The service provides packet filtering, and can negotiate security between computers on IP networks.

Typical signs of FWPKCLNT.sys errors

  2. Unexpected_Kernel_Mode_Trap fwpkclnt.sys Blue Screen, on Windows 8.1 after installing Visual Studio 2013.
  3. 0xc0000221 boot error windows 7 fwpkclnt.sys.
  4. While installing the Windows Phone SDK, the crashes began immediately after the Network Adapter Multiplexor Drivers have been installed. Blue screens seem to occur (less often) also with Visual Studio 2012 Ultimate on Win 8.1 OS.

Causes of FWPKCLNT.sys errors

One big problem is you are running PC Tools, Threat Fire, and McAfee all at the same time. These programs are causing, aggravating, or masking the cause of the issues and need to be handled. You should not have a 2nd major antivirus on the computer much less running as they will still load pieces of themselves into memory which will cause strange issues and actually lower the security. Added that all of those are known to cause issues by themselves.

Many BlueScreens are caused by old or corrupted drivers, especially video drivers, however there are other causes. A driver tried to access an address that is pageable (or that is completely invalid) while the IRQL was too high. This bug check is usually caused by drivers that have used improper addresses.

If the first parameter has the same value as the fourth parameter, and the third parameter indicates an execute operation, this bug check was likely caused by a driver that was trying to execute code when the code itself was paged out. Possible causes for the page fault include the following:

  1. The function was marked as pageable and was running at an elevated IRQL (which includes obtaining a lock).
  2. The function call was made to a function in another driver, and that driver was unloaded.
  3. The function was called by using a function pointer that was an invalid pointer.

Ways to do away with FWPKCLNT.sys errors

Firstly use DLL TOOL to remove such program as PCTools; DLL TOOL will recover the affected registry keys, and it is a lightweight which can be used to fix dll error related registry keys errors.

Secondly, check in Device Manager - Drivers tab to be sure the version you are installing actually shows up. This is because some drivers rollback before the latest is installed, so install a driver - reboot - check to be sure it is installed and repeat as needed.

And then run DLL TOOL to check the driver files and registry entries for malfunction pertaining to fwpkclnt.sys BSOD. This repair tool will automatically fix the fwpkclnt.sys errors, and other dll errors.