Note: This usually resolves "Categorization is disabled" when the error stems from a corrupted SSL certificate store within the Kerio application itself.
This blog post breaks down why this happens and provides step-by-step solutions to get your Kerio Control Web Filter back online. Why Is This Happening? This document assumes Kerio Control version 9
This document assumes Kerio Control version 9.2.x or later. For Kerio Control 10.x (NG Series), the process is similar but accessed under Security → Web Filter . Your Kerio server needs to resolve domain names
This is a catch-22. Your Kerio server needs to resolve domain names to check the license. If your Kerio Control’s own DNS settings point to an internal server that is down, it cannot reach the activation server to verify the "Categorization" status. This document assumes Kerio Control version 9
The Kerio Control Web Filter relies on a 3rd-party categorization service provided by . If Kerio cannot communicate with Zvelo's servers or if your license is invalid, the filter will automatically disable itself to prevent blocking the wrong traffic. Common culprits include:
Go to > Network > DNS .