These logs can provide specific error codes or messages that can help you or GFI support diagnose the exact failure point. For a comprehensive guide, refer to GFI's official documentation on using logs for troubleshooting.
: Upgrade to version 9.2.9 by running the 9.2.9 installer. The recovery tool will resolve any residual 28201 errors that appear during the upgrade.
is a client-side error code generated by the Kerio VPN Client software. In technical terms, it signifies a failure during the SSL/TLS handshake or a mismatch between the client’s configuration and the server’s expected parameters .
Error 28201. Failed to install VPN device driver. Result: E_UNEXPECTED, device is already registered. error 28201 kerio vpn client
: Leftover configurations from old versions interfering with new driver registration.
Right-click and the Kerio Virtual Network Adapter .
Follow these troubleshooting procedures in order to clear out system conflicts and completely restore your Kerio VPN client functionality. These logs can provide specific error codes or
On Windows 11 systems, additional factors may contribute to error 28201 or related startup failures:
Do not assume the server is online. Open your command line (CMD, Terminal, or PowerShell).
If you are an administrator seeing this error flood in from remote users, check your server logs first—you likely have a licensing shortage or a crashed VPN service. The recovery tool will resolve any residual 28201
If you are using an ARM-based device (Windows 10/11), do not use the Kerio installer. Instead, use the native Windows VPN client configured for L2TP/IPsec to connect to your Kerio Control server. support.keriocontrol.gfi.com Are you running this on a standard Windows 10/11 PC ARM-based device
Open the (regedit) and delete the following key (back up your registry first): HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Kerio . Reboot your PC before attempting the installation again. Alternative: Windows Native VPN
The cryptic nature of this error code leaves many users confused. Does it indicate a network issue? A server configuration problem? An SSL handshake failure?
Open Device Manager , expand Network Adapters , and uninstall any instances of "Kerio Virtual Network Adapter".
: Download and run the KT Uninstaller utility from GFI to clean up both 32-bit and 64-bit registry keys.