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

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[User Request] ➔ [Kerio Control] ➔ (DNS Timeout / Failure) ➔ ✘ [Zvelo Database Servers] ↓ [Web Filter Disables Categorization] The error is usually caused by:

Using standard public DNS (like Google 8.8.8.8) can sometimes lead to "Invalid Authorization" errors with the classification service.

Execute the following command to disable the reliability check: ./tinydbclient "update SiteFilter set DetectReliability=0" . Restart the service: /etc/boxinit.d/60winroute restart . This public link is valid for 7 days

| Cause | Description | |-------|-------------| | | Kerio Control Web Filter requires a valid license (subscription). If expired, categorization is disabled. | | No internet access from Kerio Control | The filter needs to contact Kerio’s cloud categorization servers. Without WAN/DNS access, it fails. | | Web filter service not running | The kerio.webfilter service may be stopped or crashed. | | Misconfiguration in admin interface | Web filter is manually disabled under Configuration → Web Filter → Status . | | DNS resolution failure | Categorization engine cannot resolve categories.kerio.com or related update servers. | | Proxy / upstream firewall blocking | Outbound HTTPS traffic to Kerio’s licensing/categorization APIs is blocked. | | Corrupted local categorization database | Database files may be corrupt, causing the service to disable itself. | | Time/date sync issue | Incorrect system time can break license validation and SSL handshakes with Kerio’s servers. |

Access the Kerio Control console via SSH (holding while clicking Status > System Health to enable it). Execute these commands:

This problem usually happens when the firewall cannot communicate with external classification servers like Zvelo . This guide explains why this problem occurs and provides practical steps to fix it. Why Does This Error Occur? Can’t copy the link right now

Sometimes a simple toggle resets the activation state.

The Kerio Control Web Filter is not a free feature. It requires a specialized, paid license that is separate from the base firewall license. The most common scenario leading to this error is an expired or improperly applied license.

Last updated: October 2025 – Compatible with Kerio Control 9.4.x and 10.x. Execute the following command to disable the reliability

Restart the service:

Check the box for and click Edit . Add the URL string: *.zvelo.com .