This solution is for advanced users experiencing error codes 0x800F020B or 0x800F0244.
Forcefully delete the problematic driver package by typing: pnputil /delete-driver oemXX.inf /force (Replace oemXX.inf with your specific file name). Retry the Kerio installation. 5. Disable Conflicting Third-Party Security Software
Your PC will reboot into the screen. Select Troubleshoot > Advanced options > Startup Settings > Restart .
Windows strictly guards the installation of network drivers. Standard user accounts, or even administrator accounts running without explicit elevation, can trigger Error 28201.
This guide is organized to guide you from the most common fixes to more advanced solutions. error 28201 kerio vpn client
your third-party antivirus shield (or completely uninstall it if a temporary disable does not release the network lock). Run the Kerio VPN Client installer.
Which (e.g., Windows 10, Windows 11) are you running?
Error 28201 occurs when the Windows installer fails to register the Virtual Network Adapter driver, a necessary component for the VPN to route traffic. Common culprits include:
Download a stable, digitally signed build such as or 9.3.5 from the Kerio Software Archive. This solution is for advanced users experiencing error
Upon reboot, a list of options will appear. Press 7 or F7 to select . Once Windows boots up, install the Kerio VPN Client.
Note: If the adapter isn't showing, try uninstalling all WAN Miniport adapters. 3. Reset Windows Network Stack
Unable to Install Kerio VPN Client on Windows with Error 28201
Open the and navigate to Programs and Features . Uninstall the Kerio VPN Client if it appears in the list. Windows strictly guards the installation of network drivers
The most effective way to resolve this error is to completely purge existing Kerio components before attempting a fresh install. Uninstall Existing Software Control Panel Programs and Features and uninstall any existing Kerio VPN Client Clear Registry Entries , and press Enter. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Kerio and delete the Remove Virtual Adapters Device Manager and expand Network Adapters Right-click and Kerio Virtual Network Adapter Also uninstall any WAN Miniport
If the installer still fails at the "UpdateDevice" step, you can manually "hand-feed" the driver:
Windows requires all hardware drivers to be digitally signed by Microsoft. Sometimes, older versions of the Kerio VPN driver fail this check, resulting in Error 28201.