Kerio Control Web Filter Is Not Activated Categorization Is Disabled Hot Page

The web filtering application layer functions via a separate, subscription-based micro-license component. Within your Web Admin pane, choose .

This message appears in Kerio Control's warning logs and indicates that the Web Filter module is not functioning correctly. The Web Filter is a critical security component that categorizes websites using a dynamic, third-party database, allowing administrators to block or allow access based on content type. Without it, categorization is disabled, meaning your content filtering rules may not apply, potentially granting users unrestricted internet access.

When this error occurs, your network losing its primary line of defense against web threats. This comprehensive guide explains why this happens and provides step-by-step solutions to fix it. Why This Error Happens The web filtering application layer functions via a

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Go to → Network → DNS .

Here’s a useful, troubleshooting-focused article based on the error message:

The error typically occurs when the firewall cannot reach the Zvelo categorization servers or when the license token has expired. This is often triggered by DNS failures, where the system marks the filter as "unreliable" after multiple failed connection attempts. Core Troubleshooting Steps 1. Verify DNS and Reachability The Web Filter is a critical security component

Kerio Control must communicate with external Kerio/GFI servers to verify its license and fetch URL categories.

: Kerio uses an external database from Zvelo to categorize websites. The system uses key tokens that expire every 21 days. If Google Public DNS or restrictive ISP servers handle these specific requests, the validation sequence frequently fails. This comprehensive guide explains why this happens and

If you use an upstream proxy, ensure the credentials and proxy settings are correctly entered under . 5. Clear the Update Cache via SSH