VIETNAM TECHNICAL VIEW
Kerio Control 9.4.2 is a major update released on October 11, 2022, designed to modernize the platform's foundation and address critical performance and security needs. This release is notable for introducing a Kernel upgrade, which significantly improves underlying system stability and hardware compatibility. Key Features and Improvements
The 9.4.2 update focuses on enhancing VPN security and administrative control:
Kernel Upgrade: The core operating system kernel was updated to provide better performance and broader support for modern hardware.
VPN 2FA Configuration: Administrators can now configure two-factor authentication (2FA) token expiration for VPN connections, allowing for a better balance between security and user convenience.
Reverse Proxy Redirection: Added support for HTTP/S redirection within the reverse proxy, simplifying the management of secure web services.
IPsec Updates: This version includes critical updates to IPsec VPN and IPsec SNAT to ensure more reliable and secure site-to-site tunnels.
Mac Performance: While the update fixed several issues, some early users reported potential upload speed degradation on Mac devices, which was later addressed in subsequent patches. Fixes and Stability Enhancements
Beyond new features, Kerio Control 9.4.2 and its immediate patch (9.4.2p1) resolved several technical hurdles:
Radius Authentication: Fixed errors that occurred during WiFi authentication when using a Radius server.
Virtual Network Fixes: Resolved an issue where virtual network adapters became unavailable in VMware deployments.
DHCP Behavior: Improved how the DHCP client handles ISP address changes on the WAN interface. How to Perform the 9.4.2 Update
Updates can be managed directly through the Kerio Control web administration interface. kerio control 942 upd
Manual Check: Navigate to Configuration > Advanced Options > Software Update and click Check Now.
Binary Upload: If the automatic update is not appearing, you can download the .img file from the Kerio Software Archive and use the Select File button to upload it manually.
Intermediate Upgrades: If you are running a very old version (pre-9.4.3), you may need to perform an intermediate step to 9.4.3 p4 to bypass file size limitations in older builds before reaching the latest versions.
For organizations needing remote management across multiple sites, this version also lays the groundwork for better integration with GFI AppManager, which allows for centralized monitoring and updates. Kerio Control 9.4.2 Release Notes - GFI
Overview. Kerio Control 9.4. 2 has been released and is available for download. Release date: Oct 11, 2022. Build ID: 7279. support.keriocontrol.gfi.com Kerio Control 9.4.2p1 Release Notes
Kerio Control 9.4.2 is a maintenance update for GFI Software’s edge router and firewall solution, primarily focused on stability, security patches, and minor functional refinements. As a mid-cycle "update" (upd), it ensures the appliance remains compatible with evolving web standards and hardware environments. Key Features and Improvements Enhanced Security:
Includes updated VPN protocols and engine fixes to protect against the latest localized vulnerabilities. Improved Web Content Filtering:
Refinements to the Kerio Control Web Filter ensure more accurate categorization of URLs, helping administrators enforce corporate usage policies effectively. Stability Patches:
This version addresses known bugs from the 9.4.1 branch, particularly regarding memory management and high-availability (HA) sync issues. VPN Client Compatibility:
Provides better support for the latest versions of Windows, macOS, and Linux, ensuring remote workers maintain a stable connection to the corporate network. Why Upgrade to 9.4.2?
Staying current with the 9.4.2 update is critical for several reasons: Performance: Kerio Control 9
Optimized traffic inspection engines reduce latency during heavy packet inspection (DPI). Compliance:
Updated logging and reporting features help IT managers meet data security compliance requirements. Hardware Support:
Better driver integration for Kerio Control hardware appliances (NG series), reducing boot times and improving interface reliability. Installation Notes Before applying the 9.4.2 update, it is recommended to: Perform a Configuration Backup: Export your settings to MyKerio or a local file. Check Subscription Status:
Ensure your GFI Software maintenance is active to access the update files. Plan for Downtime:
While the update is generally quick, it requires a system reboot, which will temporarily interrupt internet connectivity. upgrade guide
for your specific deployment, such as a physical appliance or a virtual machine?
Kerio Control version 9.4.2 was released on October 11, 2022 (Build 7279), followed quickly by a patch, 9.4.2p1, on October 17, 2022 (Build 7290). Kerio Control 9.4.2 Release Overview
This release focused on stability and core updates. However, it was followed by a patch (p1) to address specific bugs and performance issues. Version: 9.4.2 / 9.4.2p1
Key Fixes: Performance optimizations and security updates. Some users reported Internet throughput issues after this upgrade, which can be fixed by disabling Generic Receive Offload (GRO) in the system settings. How to Upgrade
If you are currently on an older version and looking to move to 9.4.2 or higher: Direct Web UI Update:
Navigate to Configuration > Advanced Options > Software Update. For the Kerio Control 942 hardware appliance :
Click Check now to find the latest version or Select File to upload a specific .img binary upgrade file manually. USB Upgrade (For Box Appliances):
Download the kerio-control-usbupgrade file to a FAT32-formatted USB drive.
Plug it into the Kerio Control box and reboot; the upgrade will start automatically. Intermediate Step Warning:
If you are on a very old version (e.g., 8.x or early 9.x), you may need to perform an intermediate upgrade (such as to version 9.4.3p4) due to file size limitations in older builds before reaching the most recent versions. Important Troubleshooting
Troubleshooting Kerio Control Upgrade Failing in the Web Admin UI
If you are currently running Kerio Control 9.4.1 or 9.4.0, here is why the kerio control 942 upd is mandatory:
No software is perfect. Be aware of these before upgrading:
v1/jsonrpc endpoint will see a 1–2 second delay on first call after restart.Configuration > Backup).System > Upgrade (web interface). The appliance will reboot in ~4 minutes.Symptom: Immediately after upload, error code -1024.
Why: You downloaded the ...-i386.upd for virtual machines or the wrong appliance model (e.g., KC-542).
Fix: Double-check the filename. Redownload from the correct KC-942 section.
For administrators currently running older versions of Kerio Control (such as 9.3.x or early 9.4.x), upgrading to build 942 is highly recommended.
Before You Upgrade:
