ZoneAlarm ZoneAlarm Pro Antivirus+Firewall 2019 SYS klwtp.sys

Klwtp.sys - Download and Fix Blue Screen Errors

Last Updated: 11/25/2023
[Time Needed for Reading: ~4-6 minutes]

klwtp.sys is considered a type of WFP Network Connection Filter Driver [fre_win7_x64] file. It is most-commonly used in System Interceptors PDK developed by ZoneAlarm. It uses the SYS file extension and is considered a Win64 EXE (Driver) file.

The first version of klwtp.sys for ZoneAlarm Antivirus 15.8.008.18174 was seen on 11/27/2019 in Windows 10. The newest file release date for ZoneAlarm Pro Antivirus+Firewall 2019 15.6.028.18012 was 04/30/2019 [version 14.0.0.85].

In this short article, you will discover detailed file information, steps for troubleshooting SYS file problems with klwtp.sys, and list of free downloads for every version that exists in our comprehensive file directory.

File Analysis Provided by Jason Geater (Author)

File Overview

General Information ^✻
File Name:	klwtp.sys
File Extension:	SYS file extension
Description:	WFP Network Connection Filter Driver [fre_win7_x64]
Object File Type:	Driver
File Operating System:	Windows NT 32-bit
MIME Type:	application/octet-stream
User Popularity Rating:

Developer and Software Information
Software Developer:	AO Kaspersky Lab
Software Program:	System Interceptors PDK
Legal Copyright:	© 2017 AO Kaspersky Lab. All Rights Reserved.

File Details
Character Set:	Unicode
Language Code:	English (U.S.)
File Flags:	(none)
File Flags Mask:	0x003f
Entry Point:	0x25000
Code Size:	125952

View Other klwtp.sys Information

File Info	Description
File Size:	173 kB
File Modification Date/Time:	2019:12:16 15:56:17+00:00
File Type:	Win64 EXE
MIME Type:	application/octet-stream
Machine Type:	AMD AMD64
Time Stamp:	2018:02:08 14:50:22+00:00
PE Type:	PE32+
Linker Version:	14.0
Code Size:	125952
Initialized Data Size:	19456
Uninitialized Data Size:	0
Entry Point:	0x25000
OS Version:	6.1
Image Version:	6.1
Subsystem Version:	6.1
Subsystem:	Native
File Version Number:	14.0.0.85
Product Version Number:	14.0.0.85
File Flags Mask:	0x003f
File Flags:	(none)
File OS:	Windows NT 32-bit
Object File Type:	Driver
File Subtype:	7
Language Code:	English (U.S.)
Character Set:	Unicode
Company Name:	AO Kaspersky Lab
File Description:	WFP Network Connection Filter Driver [fre_win7_x64]
File Version:	14.0.0.85
Internal Name:	klwtp
Legal Copyright:	© 2017 AO Kaspersky Lab. All Rights Reserved.
Product Name:	System Interceptors PDK
Product Version:	14.0.0.85
Legal Trademarks:	Registered trademarks and service marks are the property of their respective owners

^✻ Portions of file data provided by Exiftool (Phil Harvey) distributed under the Perl Artistic License.

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What are klwtp.sys Error Messages?

klwtp.sys Blue Screen of Death (BSOD) Errors

There are a number of reasons why you could be encountering issues with klwtp.sys. Most of the issues concerning sys files involve Blue Screen of Death (BSOD) errors. These types of klwtp.sys errors can be cause by hardware problems, outdated firmware, corrupt drivers, or other software-related (eg. ZoneAlarm Pro Antivirus+Firewall 2019 update) issues. Some of these errors include:

klwtp.sys could not be found.
klwtp.sys failed to load.
The file klwtp.sys is missing or corrupt.
Windows failed to start - klwtp.sys.

A problem has been detected and Windows has been shut down to prevent damage to your computer. The problem seems to be caused by the following file: klwtp.sys.

:( Your PC ran into a problem that it couldn't handle, and now needs to restart. You can search for the error online: [BSOD] (klwtp.sys).

STOP 0×0000007A: KERNEL DATA INPAGE (klwtp.sys) STOP 0x00000050: PAGE FAULT IN A NONPAGED AREA (klwtp.sys) STOP 0x0000007E: SYSTEM THREAD EXCEPTION NOT HANDLED (klwtp.sys) STOP 0x0000003B: SYSTEM SERVICE EXCEPTION (klwtp.sys) STOP 0x0000001E: KMODE EXCEPTION NOT HANDLED (klwtp.sys) STOP 0x0000000A: IRQL NOT LESS EQUAL (klwtp.sys)

It's Critical to Resolve Blue Screen of Death Errors

In the majority of cases, you will encounter klwtp.sys BSOD errors after you've installed new hardware, software (ZoneAlarm Pro Antivirus+Firewall 2019), or performed a failed Windows Update. In other cases, software corruption caused by a malware infection can lead to klwtp.sys Blue Screen of Death errors. Therefore, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.

GEEK TIP : As a rule of thumb, it's always a good idea to create a Windows "Snapshot" backup / System Restore Point before making any hardware or software changes to your computer. That way, it's very easy to restore your system in the unfortunate event you encounter a klwtp.sys Blue Screen of Death error after recent changes.

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How to Fix klwtp.sys Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your klwtp.sys issue. These troubleshooting steps are listed in the recommended order of execution.

Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

Hit the Windows Start button
When you see the search box, type "System Restore" and press "ENTER".
In the search results, find and click System Restore.
Please enter the administrator password (if applicable / prompted).
Follow the steps in the System Restore Wizard to choose a relevant restore point.
Restore your computer to that backup image.

If the Step 1 fails to resolve the klwtp.sys error, please proceed to the Step 2 below.

Step 2: If recently installed ZoneAlarm Pro Antivirus+Firewall 2019 (or related software), uninstall then try reinstalling ZoneAlarm Pro Antivirus+Firewall 2019 software.

You can uninstall ZoneAlarm Pro Antivirus+Firewall 2019 software by following these instructions (Windows XP, Vista, 7, 8, and 10):

Hit the Windows Start button
In the search box, type "Uninstall" and press "ENTER".
In the search results, find and click "Add or Remove Programs"
Find the entry for ZoneAlarm Pro Antivirus+Firewall 2019 15.6.028.18012 and click "Uninstall"
Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall ZoneAlarm Pro Antivirus+Firewall 2019 software.

If this Step 2 fails as well, please proceed to the Step 3 below.

ZoneAlarm Pro Antivirus+Firewall 2019 15.6.028.18012

ZoneAlarm

Step 3: Perform a Windows Update.

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many klwtp.sys error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

Hit the Windows Start button
In the search box, type "Update" and press "ENTER".
In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
If updates are available for download, click "Install Updates".
After the update is completed, restart your PC.

If Windows Update failed to resolve the klwtp.sys error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.

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If Those Steps Fail: Download and Replace Your klwtp.sys File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate klwtp.sys file version. We maintain a comprehensive database of 100% malware-free klwtp.sys files for every applicable version of ZoneAlarm Pro Antivirus+Firewall 2019. Please follow the steps below to download and properly replace you file:

Locate your Windows operating system version in the list of below "Download klwtp.sys Files".
Click the appropriate "Download Now" button and download your Windows file version.
Copy this file to the appropriate ZoneAlarm Pro Antivirus+Firewall 2019 folder location:

Windows 10: C:\Program Files (x86)\CheckPoint\ZoneAlarm\avsys\install\instdrivers\kl1\x86\
Windows 10: C:\Windows\System32\drivers\
Windows 10: C:\Program Files (x86)\CheckPoint\ZoneAlarm\avsys\install\instdrivers\kl1\x64\
Windows 10: C:\Program Files (x86)\CheckPoint\ZoneAlarm\avsys\install\instdrivers\kl1\x86\
Windows 10: C:\Windows\System32\drivers\
Show 1 more directory +
Windows 10: C:\Program Files (x86)\CheckPoint\ZoneAlarm\avsys\install\instdrivers\kl1\x64\
Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.

GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve klwtp.sys problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.

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Download klwtp.sys Files (Malware-Tested 100% Clean)

CAUTION : We strongly advise against downloading and copying klwtp.sys to your appropriate Windows system directory. ZoneAlarm typically does not release ZoneAlarm Pro Antivirus+Firewall 2019 SYS files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing klwtp.sys and all other SYS files for ZoneAlarm Pro Antivirus+Firewall 2019. An incorrectly installed SYS file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

ZoneAlarm Pro Antivirus+Firewall 2019 15.6.028.18012

File Name

Software Version

File Version

Architecture

klwtp.sys

14.0.0.85

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
Software:	System Interceptors PDK
Software Version:	14.0.0.85
File Version:	14.0.0.85
File Size:	152256
File Date:	12/16/2019
MD5 Checksum:	a6f1da5ea904a8e88ad6c5c45f6f01c6
SHA1 Checksum:	57590d9b60fa6a69322180e1c4be2796d8c1bea4
SHA256 Checksum:	e3108740a3fff69c91cb87fe7ae926976a164243e2850f20ff1ccd373aa6d039
CRC32:
File Directory Location:	C:\Program Files (x86)\CheckPoint\ZoneAlarm\av ...

File Version, System, and Machine Information
File Type:	Win32 EXE
Image Version:	6.1
Initialized Data Size:	15872
Linker Version:	14.0
Machine Type:	Intel 386 or later, and compatibles
PE Type:	PE32
Subsystem:	Native
Subsystem Version:	6.1
File Modification Date/Time:	12/16/2019

klwtp.sys

14.0.0.85

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
Software:	System Interceptors PDK
Software Version:	14.0.0.85
File Version:	14.0.0.85
File Size:	177344
File Date:	12/16/2019
MD5 Checksum:	55e4e9f2bd4f224ed1ac8764724bdf1d
SHA1 Checksum:	d511dfdf0546f5dd3b5cb56d66b4c402a75f2d62
SHA256 Checksum:	f1f4a44eafdf1e9429101df622e57c4bcce187b80ce1101bf4e367d53a7592f7
CRC32:
File Directory Location:	C:\Windows\System32\drivers\ C:\Program Files (x86)\CheckPoint\ZoneAlarm\av ...

File Version, System, and Machine Information
File Type:	Win64 EXE
Image Version:	6.1
Initialized Data Size:	19456
Linker Version:	14.0
Machine Type:	AMD AMD64
PE Type:	PE32+
Subsystem:	Native
Subsystem Version:	6.1
File Modification Date/Time:	12/16/2019

ZoneAlarm Antivirus 15.8.008.18174

File Name

Software Version

File Version

Architecture

klwtp.sys

30.5.91.0

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
Software:	Coretech Delivery
Software Version:	30.5.91.0
File Version:	30.5.91.0
File Size:	174424
File Date:	12/06/2019
MD5 Checksum:	b6b6dd5600167b6ae1d6c0ce8c1ff8e0
SHA1 Checksum:	b3655b5a6427bad11b8e84ec1c0218080d51f11e
SHA256 Checksum:	637b45aa813a3978bb7dc6d70bf25346596acbe041b109ad93a5b5f469ad3bd4
CRC32:
File Directory Location:	C:\Program Files (x86)\CheckPoint\ZoneAlarm\av ...

File Version, System, and Machine Information
File Type:	Win32 EXE
Image Version:	6.1
Initialized Data Size:	16896
Linker Version:	14.16
Machine Type:	Intel 386 or later, and compatibles
PE Type:	PE32
Subsystem:	Native
Subsystem Version:	6.1
File Modification Date/Time:	12/06/2019

klwtp.sys

30.5.91.0

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
Software:	Coretech Delivery
Software Version:	30.5.91.0
File Version:	30.5.91.0
File Size:	212304
File Date:	12/06/2019
MD5 Checksum:	53cc1b792308a3ed4023b391d2918513
SHA1 Checksum:	33f1f90bb2c60fbc279f4b344555935b48881722
SHA256 Checksum:	e50faf6d53ee575e8ce395c69ef859f67f0036a51911d04ccd65f2eddd6cf64d
CRC32:
File Directory Location:	C:\Windows\System32\drivers\ C:\Program Files (x86)\CheckPoint\ZoneAlarm\av ...

File Version, System, and Machine Information
File Type:	Win64 EXE
Image Version:	6.1
Initialized Data Size:	25600
Linker Version:	14.16
Machine Type:	AMD AMD64
PE Type:	PE32+
Subsystem:	Native
Subsystem Version:	6.1
File Modification Date/Time:	12/06/2019

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Files Related to klwtp.sys

SYS Files Related to klwtp.sys

File Name	Description	Software Program (Version)	File Size (bytes)	File Location
klif.sys	Core System Interceptors [fre_win8_x86_sdk_noagava]	System Interceptors PDK (16.1.18.0)	845000	C:\Windows\ServiceProfiles\NetworkService\AppDa...
klupd_klif_kimul.sys	Kernel heuristics engine	Kaspersky Anti-Virus (6.0.1.990)	99152	C:\Windows\ServiceProfiles\NetworkService\AppDa...
klelam.sys	Early Launch Anti-Malware Filter [fre_win8_x86]	System Interceptors PDK (14.0.0.1)	23064	C:\Program Files\WindowsApps\Microsoft.ZuneVide...
klupd_klif_klbg.sys	Kaspersky Lab Boot Guard Driver	Kaspersky Bases (11.2.9.0)	119744	C:\Windows\Temp\
kltdf.sys	TDI Network Connection Filter Driver [fre_wnet_x64]	System Interceptors PDK (14.0.0.7)	105664	C:\Windows\Temp\

Other Files Related to klwtp.sys

File Name	Description	Software Program (Version)	File Size (bytes)	File Location
WmiApRpl.ini	Windows Initialization	ZoneAlarm Pro Antivirus+Firewall 2019 15.6.028.18012	29736	C:\Windows\inf\WmiApRpl\0009\
api-ms-win-core-heap-l...	ApiSet Stub DLL	Microsoft® Windows® Operating System (10.0.17134.12)	11112	C:\Users\Tester\AppData\Local\Microsoft\OneDriv...
api-ms-win-core-sysinf...	ApiSet Stub DLL	Microsoft® Windows® Operating System (10.0.17134.12)	12136	C:\Users\Tester\AppData\Local\Microsoft\OneDriv...
api-ms-win-core-sysinf...	ApiSet Stub DLL	Microsoft® Windows® Operating System (10.0.10586.212)	19648	C:\Program Files (x86)\CheckPoint\ZoneAlarm\avsys\
diagwrn.xml	Extensible Markup Language	ZoneAlarm Pro Antivirus+Firewall 2019 15.6.028.18012	5718	C:\Windows\System32\Sysprep\Panther\

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