Kerio Control Web Filter Is Not Activated Categorization Is Disabled Fixed ((free)) Jun 2026

In the Web Administration interface, go to .

In the world of network management, few things are as frustrating as seeing a "Not Activated" status on a tool you rely on. Here is the story of how the Kerio Control Web Filter's categorization issue—a common headache for admins—is typically diagnosed and fixed. The Situation Everything seems fine until the administrator logs into the Kerio Control Webadmin and sees a warning: In the Web Administration interface, go to

Web Filter categorization disabled. Serial number: ko-197974 In the Web Administration interface

Ensure the checkbox is checked.

Restart the entire Kerio Control engine if needed: In the Web Administration interface, go to

: Kerio Control obtains a Zvelo token that expires every 21 days. If DNS issues block the token refresh, the firewall logs an Invalid Authorization error.