Kerio Control Vpn Client 942

One final warning for 9.4.2: The "Fail closed" (kill switch) feature is now enabled by default for new installations. If the VPN drops, the client blocks all internet traffic until the tunnel is restored.

This is great for security, but terrible for helpdesk tickets.

To disable it (for remote workers without sensitive data):

Alternatively, push this registry key: HKLM\SOFTWARE\Kerio\VPNClient\Security\BlockTrafficOnDisconnect = 0 (DWORD) kerio control vpn client 942

Why should you specifically look for build 942? Earlier builds (e.g., 9.2.4 or 9.3.x) suffered from specific defects that were aggressively patched in version 942.

While "942" is the major build, check for hotfixes. GFI released 942.1 and 942.2 to address a memory leak in the kerio_vpn_service.exe. Install these via the Windows Update catalog.

As of 2024, Kerio Control operates under GFI Software. Version 9.4.2 is considered an older, legacy build. One final warning for 9

Even with the stability of build 942, issues arise. Here is the definitive troubleshooting matrix.

Cause: UDP port 500 or 4500 is blocked by an upstream ISP or corporate proxy. Fix:

You might wonder: Is Kerio Control VPN Client 942 still relevant in the era of Zero Trust and WireGuard? In practice

| Feature | Kerio Client 942 | OpenVPN | WireGuard | | :--- | :--- | :--- | :--- | | Protocol | IPSec IKEv2 | SSL/TLS | UDP-based Crypto | | NAT Traversal | Excellent (via UDP 4500) | Good | Excellent | | CPU Overhead | Medium (HW offload) | High | Very Low | | Windows GUI | Native system tray | Basic (OpenVPN GUI) | Command-line heavy | | Best Use Case | Mixed Windows/Legacy LAN | Maximum firewall bypass | High-speed bulk transfer |

The Verdict: If your firewall is already a Kerio Control appliance, the native 942 client offers deeper integration (user lockout sync, bandwidth quotas, and real-time log viewing) than any third-party IPSec client.

According to the official changelog, Kerio Control VPN Client 9.4.2 focuses on:

In practice? The IPv6 support works, but only if your Kerio Control firewall is also on version 9.4.2 or higher (patch 2 is mandatory, or you’ll see dropped routes).