This confirms a hostname mismatch. Another common line:
Error 28201 typically occurs when the Kerio Control VPN client fails to install its virtual network driver because a previous version left behind corrupted registry keys or conflicting device profiles. support.keriocontrol.gfi.com Quick Fixes
That points to outdated client or server TLS version mismatch (e.g., server requires TLS 1.2 but client tries 1.0). error 28201 kerio vpn client
Do you have any or other VPN software installed?
This guide provides steps for a clean re-installation to resolve the issue on Windows systems GFI Support Method 1: Clean Re-installation (Recommended) This confirms a hostname mismatch
: Right-click your downloaded .exe installer, select Properties , check the Unblock box (if available), and click OK. Run the installer as an administrator.
Warning: Be careful when editing the registry. Do you have any or other VPN software installed
Always download the latest version of the Kerio VPN Client from the official GFI/Kerio website. Newer versions are optimized for modern Windows updates and security protocols.
If the internal Windows network configuration is unstable, a full reset will clear out broken paths and allow the Kerio driver to bind correctly.
Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\ and delete the Kerio key.
No. It occurs on Windows, macOS, and even Linux versions of the Kerio VPN Client, though Windows is most common.