# Check kernel version
uname -a
Kerio Control 9.4.2 is a software-based firewall and router operating system that can be deployed on dedicated hardware (appliances), as a virtual machine (VMware, Hyper-V), or as a software installation on standard x86 servers. Version 9.4.2 was released as a cumulative maintenance update in the 9.4.x lifecycle.
One of the most used features is the HTTP/S filter, powered by a third-party categorization database (updatable via license). With 9.4.2, the HTTPS inspection (Man-in-the-Middle) uses a more robust certificate cache, reducing browser warnings. However, note that with modern QUIC protocol (HTTP/3), some inspection is bypassed—a known limitation across all UTM products of this era. kerio control 9.4.2