: The "Kerio Virtual Network Adapter" may be stuck in a half-installed state in the Device Manager.
: The system believes the device is already registered, preventing a fresh installation. Step-by-Step Solutions 1. Perform a Clean Cleanup with KT Uninstaller
: Newer Windows versions (20H2 and later) may block older, unsigned Kerio drivers. error 28201 kerio vpn client
temporarily to prevent it from blocking driver injection. Right-click the tool and select Run as Administrator .
Standard uninstallation often leaves behind registry keys that trigger Error 28201. : The "Kerio Virtual Network Adapter" may be
Download the utility from the GFI Support Portal .
Perform the cleanup for both versions to ensure all registry entries are wiped. Restart your computer immediately after the cleanup. 2. Manually Remove Drivers and Registry Keys If the uninstaller fails, manual intervention is required: Perform a Clean Cleanup with KT Uninstaller :
GFI provides a specific recovery tool for "0x800F020B" or "unspecified" errors associated with 28201. Download the .
: Run Command Prompt as Administrator and execute: netsh winsock reset netsh int ip reset 3. Use the Kerio VPN Recovery Tool
After the tool completes, attempt to install the latest Kerio VPN Client again. 4. Manual Driver Installation Workaround