Even with a license, the service may be stopped or hung.
The Kerio Control Web Filter relies on a third-party categorization database, typically from , to analyze and classify web content. For the filter to work, your Kerio Control server must maintain a valid license and be able to reach the licensing and categorization servers. When it fails, the system disables the filter, often logging the messages you see. The error can arise from several common issues: Even with a license, the service may be stopped or hung
This is the most common cause. The web filter is a separate, licensed component. When it fails, the system disables the filter,
Because the web filter checks content categories continuously, it generates a high volume of fast DNS inquiries. Strict internet service providers (such as Deutsche Telekom) often treat this behavior as a flood attack and temporarily block the queries. Step 1: Change and Verify DNS Forwarding Configurations When it fails
Click the button and confirm the security warning. Step 2: Run Configuration Commands
Ensure "Kerio Control Web Filter" is checked in Content Filter settings.