If you are currently running 9.4.2, audit your logs. If you see any inbound scanning or brute-force attempts, it is time to plan your migration. The internet of 2025 is far more dangerous than the internet of 2021, and your firewall must evolve with it.
Unlike consumer routers, Kerio Control offers granular control via a web administration interface (MyKerio) or a local console. The 9.x series, culminating in the 9.4.2 update in 2021, was widely regarded as the most mature iteration of the Kerio architecture. Released in early 2021, version 9.4.2 was not a feature-packed "major" release, but a critical maintenance and security update to the 9.4 stream. At the time, the IT world was adjusting to the long-term impacts of COVID-19 (mass remote work), making VPN stability and security the highest priority. kerio control 942 2021
However, time marches on. The 2021 release is now a security relic. Use it for nostalgia, learning, or legacy bridging, but do not trust it to protect a modern business perimeter. The Kerio Control 9.4.2 (2021) release represents the end of an era for lightweight, affordable UTM firewalls. It offered a perfect balance of performance and features at a time when hybrid work was becoming the norm. Today, it serves as a reliable time capsule—but one that should be deployed with extreme caution. If you are currently running 9