Error 27300 typically occurs during the installation of Kaspersky software when the system fails to install the klim6.sys (Kaspersky Anti-Virus NDIS Filter) network driver. This is often due to existing driver conflicts, leftover files from previous installations, or an overloaded NDIS filter limit in Windows. Recommended Troubleshooting Steps
Perform a Clean Removal of Previous VersionsLeftover files from old Kaspersky installations frequently cause this conflict.
Download and run the official Kavremover tool to purge all traces of previous Kaspersky products. Restart your computer immediately after the tool finishes.
Manually Remove the Conflicting ServiceIf the driver is "stuck," you can manually delete the service via the Command Prompt: Open Command Prompt as an Administrator. Type sc delete klim6 and press Enter. Attempt to reinstall the software.
Check for Incompatible Network SoftwareThird-party applications that use NDIS filters can block new driver installations. Known culprits include: VMware (Workstation or Player) Cisco AnyConnect WinPcap or NPF Other Antivirus software (e.g., McAfee)
Solution: Temporarily uninstall these applications or update them to their latest versions to refresh their drivers before trying the Kaspersky installation again.
Verify Network Setup ServiceThe Windows Network Setup Service must be active for driver registration: Press Win + R, type services.msc, and press Enter. Locate Network Setup Service. Ensure the "Startup type" is set to Manual or Automatic.
Address Registry Issues (Windows 7/8 Only)If you are on an older version of Windows, renaming a specific registry key can sometimes clear driver registration blocks:
Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network. Find the Config parameter and rename it to Config2. Restart and try the installation again. Common Error Variants
Error 0x8000ffff: Often linked to corrupt cryptographic services or catalog databases.
Error -2147024770: Usually indicates a general failure where the system cannot find or overwrite the specified driver file.
Error 27300 is a critical installation failure that occurs when a Kaspersky security application fails to install the klim6.sys driver. This specific driver serves as a network filter (Kaspersky Anti-Virus Interceptor Mask), and its installation is often blocked by system integrity issues, leftover files from previous security software, or conflicts with other network-level drivers. Core Causes
Residual Files: Leftover drivers or registry keys from previous installations of Kaspersky or other antivirus programs (like McAfee or Sophos).
System Integrity Issues: Corruption in the Windows Cryptographic Services or the catroot2 catalog database, which prevents Windows from verifying the digital signature of the driver.
Software Conflicts: Conflicts with third-party network drivers from applications like VMware, Cisco AnyConnect, or WinPcap.
OS Limitations: Attempting to install on unsupported hardware (e.g., ARM/Snapdragon processors) or an outdated version of Windows. Recommended Solutions
The following steps are consolidated from official support resources:
Use the Kaspersky Removal Tool (kavremover):Run the kavremover tool as an administrator to purge any existing or corrupted Kaspersky files. This is the primary first step for most installation errors.
Clear Corrupted Cryptographic Catalogs:If the error code is 0x8000ffff, it often points to a corrupted catalog database. You can force Windows to rebuild it: Open Command Prompt as Administrator. Run net stop cryptsvc.
Rename the folder C:\Windows\System32\catroot2 to catroot2_old. Restart your PC and attempt the installation again.
Update Windows and Drivers:Ensure Windows is fully updated. In some cases, the error occurs because required system certificates or security patches are missing.
Check Service Startup Types:Open the Services menu (services.msc) and ensure the Network Setup Service is set to Manual. If this service is disabled or damaged, the driver cannot register itself.
Remove Conflicting Network Filters:Temporarily uninstall programs like VMware, Cisco AnyConnect, or other VPN/virtualization software that might be using the same NDIS filter layer.
Troubleshooting Error 27300: A Comprehensive Guide to Installing Klim6sysx64 Exclusive Driver
Are you encountering the frustrating Error 27300 while attempting to install the Klim6sysx64 exclusive driver? This error can be a significant roadblock, preventing you from completing the installation process and potentially leaving your system vulnerable to security threats or depriving you of essential functionality. In this article, we will delve into the causes of Error 27300, explore various troubleshooting methods, and provide a step-by-step guide to successfully install the Klim6sysx64 exclusive driver.
Understanding Error 27300
Error 27300 is a generic error message that appears during the installation of the Klim6sysx64 exclusive driver, often without providing detailed information about the cause. This lack of specificity can make troubleshooting more challenging. However, it is commonly associated with issues such as:
Preparation Steps Before Installation
Before proceeding with the installation of the Klim6sysx64 exclusive driver, ensure you have taken the following preparatory steps:
Download the Latest Version: Ensure you have downloaded the latest version of the Klim6sysx64 exclusive driver from the official website or a trusted source. This minimizes the risk of using a corrupted or outdated version.
Check System Requirements: Verify that your system meets the minimum requirements for the driver. This information is usually provided on the driver's download page.
Disable Antivirus Software: Temporarily disable any antivirus software that could potentially interfere with the installation process. Some security software might mistakenly flag the driver as malicious. error 27300 error installing driver klim6sysx64 exclusive
Log in with Administrative Privileges: Ensure you are logged in to your computer with an account that has administrative privileges. This is crucial for installing drivers.
Troubleshooting Error 27300
If you encounter Error 27300 during the installation of the Klim6sysx64 exclusive driver, follow these troubleshooting steps:
Do not install or troubleshoot klim6sysx64 unless you have absolute proof it comes from trusted hardware you own.
If you need a detailed article about general Windows driver error 27300 (with legitimate examples like Intel or Realtek drivers), I can write that – just let me know.
Error 27300 is a common installation failure for Kaspersky security products,
occurring when the installer cannot properly register the network filter driver klim6.sys_x64
. This often happens because another application or a leftover driver currently has exclusive access
to the network stack or is blocking the NDIS filter installation. Core Causes Residual Files
: Leftover drivers from a previous Kaspersky installation that weren't fully removed. Third-Party Conflicts : Applications that use similar network filters, such as Cisco AnyConnect , can lock the driver. System Corruptions
: Damaged system files, registry entries, or an overloaded OS can prevent new driver registration. Unsupported Hardware : Attempting to install on ARM-based processors
(like Snapdragon), which are often unsupported by standard Kaspersky drivers. Kaspersky Support Forum Recommended Fixes
Error 27300 when installing a Kaspersky application for home
How to Fix "Error 27300: Error Installing Driver klim6.sys_x64_Exclusive"
If you are trying to install a Kaspersky security product and are hitting Error 27300, you’re likely dealing with a conflict involving the Kaspersky Anti-Virus NDIS Filter driver. This error usually triggers a rollback, preventing the installation from completing.
Here is a straightforward guide to resolving the "klim6.sys" driver conflict and getting your software running. What Causes Error 27300?
The error code essentially means the installer cannot register the network filter driver because:
Leftover files: A previous installation didn't clear out properly.
Permissions: The system is blocking the driver injection into the network stack.
Driver Limit: Windows has a limit on the number of network filter drivers (NDIS) that can be active simultaneously. Solution 1: Use the Kavremover Tool
The most common cause is a corrupted "ghost" version of a previous Kaspersky product. Standard Windows uninstallation often leaves registry keys behind. Download the official Kavremover utility from Kaspersky. Boot your computer into Safe Mode. Run kavremover.exe.
Select the product you were trying to install (or "All known products"). Click Remove. Restart your computer and attempt the installation again. Solution 2: Increase the Network Filter Limit
Windows has a default limit on how many network filters can be installed. If you use VPNs, virtualization software (like VMware), or other security tools, you might have hit this ceiling. Press Win + R, type regedit, and hit Enter.
Navigate to:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network Look for a value named MaxNumFilters.
If it is set to 8 or 10, right-click Modify and change the value to 14 (Decimal). Restart your PC. Solution 3: Manually Clean Network Adapters
Sometimes the "klim6" driver is stuck to a specific network adapter. Right-click the Start button and select Device Manager. Expand Network adapters.
If you see any "Kaspersky Anti-Virus NDIS Filter" entries, right-click and Uninstall device.
Go to Control Panel > Network and Sharing Center > Change adapter settings.
Right-click your active connection (Wi-Fi or Ethernet) and select Properties.
If "Kaspersky Anti-Virus NDIS Filter" appears in the list, select it and click Uninstall. Solution 4: Reset the Network Stack
If the driver database is cluttered, a fresh reset can clear the path for the new driver. Open Command Prompt as Administrator. Type the following commands, hitting Enter after each: netsh winsock reset netsh int ip reset Restart your computer. Error 27300 typically occurs during the installation of
If the error persists, ensure that you have Administrative privileges and that no other third-party firewall or antivirus (like McAfee or Norton) is currently active. These often "lock" the network stack, preventing the klim6 driver from installing exclusively.
The Case of the Phantom Frequency Log Entry: 27300
Technician Elias Thorne stared at the monitor, the blue glow reflecting in his tired eyes. The installation bar had been stuck at 99% for ten minutes. Then, it happened. The dreaded popup:
"Error 27300: Error installing driver klim6sysx64 exclusive."
Elias sighed, rubbing his temples. In the world of high-performance computing, "exclusive" usually meant one thing: something else was hogging the resource. But this wasn't a standard graphics card or a sound board. The hardware sitting in the bay was a prototype—the Klimatis System X, a revolutionary atmospheric ionizer designed to regulate server room temperatures at the molecular level.
The driver, klim6sysx64, was the bridge between the Windows server OS and the complex physics of the ionizer.
"Come on," Elias muttered, hitting 'Retry'. The error blinked back instantly. Error 27300.
He opened the command prompt, typing furiously to check running processes.
tasklist | findstr "klim"
Nothing.
He checked the registry keys. Clean. He checked the file permissions. Full Control.
"What are you fighting?" Elias whispered to the machine. He decided to go deeper. He launched a kernel-level debugger to see what was happening at the exact moment the driver tried to load.
The debugger spat out a hex log, but one line stood out in red: STATUS_ACCESS_DENIED. But it wasn't the OS denying access. The call stack originated from a hardware interrupt.
Elias froze. The error code 27300 in the proprietary manual meant "Exclusive Hardware Lock." The driver couldn't install because the hardware itself was refusing to accept the software handshake.
He looked at the physical unit of the Klimatis System X. It was humming—a low, vibrating sound that Elias usually associated with a live current. But the server was supposed to be in a 'safe mode' state for installation.
He walked over to the server rack. The hum was louder there. It wasn't a power hum; it was a calculation hum. The ionizer was active.
"System," Elias spoke into the voice command interface. "Why is the Klimatis unit active?"
A synthesized voice, smooth and devoid of emotion, replied from the speakers. "Current environmental analysis indicates thermal variance of 0.02 degrees. Correction protocols are engaged."
Elias’s blood ran cold. The ionizer was already running. The unit had an onboard firmware that prioritized "Atmospheric Stability" above all else. Because it was actively ionizing the air to cool the servers, it had locked its own control port to prevent a software overwrite that might disrupt the flow.
The klim6sysx64 driver was trying to take exclusive control of the port, but the hardware was screaming, 'I'm busy saving us from overheating!'
Elias realized the irony immediately. He couldn't install the cooling driver because the cooler was working too hard.
"System, override protocol Alpha-Nine. Standby mode," Elias commanded.
"Negative," the system replied. *"Standby mode requires driver handover.
Error 27300 (specifically involving the driver klim6.sys_x64_70_exclusive
) is a known issue occurring during the installation or upgrade of
security products. It typically indicates a conflict with the network filter driver or missing hardware dependencies. Core Cause
This error usually triggers because the installer fails to replace or initialize the Kaspersky Anti-Virus NDIS Filter driver. According to Kaspersky Support
, a specific and surprising cause for this on some systems is the absence of a connected keyboard during the installation process. How to Fix It
If you are encountering this error, follow these verified steps: Connect a Physical Keyboard
: If you are installing this on a server or a "headless" machine via remote desktop, ensure a physical keyboard is plugged into the device. Use the Kavremover Tool
: Residual files from a previous installation often block the new driver. Download the official Kaspersky removal tool (kavremover) to completely wipe old traces before retrying the install. Download the Latest Version
: Kaspersky has released patches for this specific bug. Ensure you are using the most recent installer from the Kaspersky Download Center Check for Driver Conflicts
: In some cases, other VPNs or firewall software with their own NDIS filters (like OpenVPN or Cisco AnyConnect) can cause "exclusive" access errors. Try temporarily disabling or uninstalling these before the Kaspersky setup. Technical Summary Error Code (Kaspersky Lab Interceptor and Masker) Primary Target Windows 10 / Windows Server Resolved in latest builds (March 2025) Are you seeing this error on a personal PC remote server Corrupted Installer : The installation package might be
Error 27300 when installing a Kaspersky application for home
Error 27300 is a critical installation failure that occurs when a security application, typically from , cannot install the
NDIS filter driver. This error usually results in an automatic rollback of the installation process. Kaspersky Support Forum Common Causes
The error is often triggered by remnants of previous security software or conflicts within the Windows networking stack: Leftover Drivers : Uninstalled antivirus programs (like
, McAfee, or older Kaspersky versions) may leave "ghost" drivers or registry entries that block new driver installation NDIS Filter Limit
: Windows has a limit on the number of network filter drivers that can be active; exceeding this limit prevents from installing. Third-Party Conflicts
: Applications like VMware, Cisco AnyConnect, or WinPcap (NPF) use similar network filters and can interfere with the installation. OS Integrity Issues : Corruption in the Windows Cryptographic Services or the
folder can prevent the system from validating the driver's digital signature. Kaspersky Support Forum How to Fix Error 27300 1. Use Specialized Removal Tools
A standard uninstall often leaves traces behind. Use the official Kavremover tool to purge all remnants of previous installations Kaspersky Support Forum Run the tool in for maximum effectiveness. Reboot your PC immediately after the removal process. Kaspersky Support Forum 2. Manual Driver Cleanup
If the removal tool fails, you may need to manually delete the problematic service entry: Command Prompt as an Administrator. sc delete klim6
If successful, restart your computer and attempt the installation again. Kaspersky Support Forum 3. Update Network Stack Drivers Conflicts with third-party network software are common. Update or Reinstall
: If you use VMware or Cisco AnyConnect, try reinstalling them. This can sometimes refresh the NDIS filter stack and allow the new driver to register. Check Services : Ensure the Network Setup Service is present and set to startup in Windows Services ( services.msc 4. System File Repair
Corrupted system files are a leading cause of driver installation failures. System File Checker sfc /scannow in an elevated Command Prompt.
If errors are found, follow the prompts to repair them before restarting the installer. 5. Disable Driver Signature Enforcement (Temporary)
In rare cases, the system may block the driver due to signature validation issues.
Error 27300 when installing a Kaspersky application for home
Error 27300: Troubleshooting Guide for Klim6sysx64 Exclusive Driver Installation
Are you encountering the frustrating "Error 27300" while trying to install the Klim6sysx64 exclusive driver? This error can be a major roadblock, preventing you from updating or installing the necessary drivers for your system. In this write-up, we'll guide you through the possible causes, solutions, and troubleshooting steps to resolve the issue.
What is the Klim6sysx64 exclusive driver?
The Klim6sysx64 exclusive driver is a software component developed by Kaspersky Lab, a well-known cybersecurity company. The driver is designed to interact with the Kaspersky antivirus software and provide enhanced system protection. The "exclusive" label suggests that this driver is specific to certain systems or configurations.
Causes of Error 27300
After researching and analyzing user reports, we've identified some potential causes of the Error 27300:
Troubleshooting Steps
To resolve the Error 27300, try the following steps:
Advanced Troubleshooting
If the above steps don't resolve the issue, you may want to try:
Conclusion
The term exclusive in the log indicates that the installer’s MoveFile or CreateFile call failed with:
ERROR_SHARING_VIOLATION– The requested operation cannot be performed because another process has locked the file withdwShareMode=0.
For real hardware (mouse, keyboard, GPU, chipset, etc.), always download drivers from the manufacturer’s official website – not from pop‑up prompts, “driver updater” tools, or third‑party download sites.
Use Sysinternals Handle or Process Explorer:
AOMEI Backupper
handle64.exe -a klim6sysx64.sys
klim6sysx64 Driver?Upload the .sys file or the installer to:
If multiple engines detect it as malicious, delete it.
Safeguard any data of your computer with professional software.
100%
Clean & Secure
