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

| Action | Purpose | |--------|---------| | Monitor license expiry (30-day reminder) | Avoid unexpected expiration | | Whitelist Kerio’s update domains in outbound rules | Ensure categorization works | | Enable NTP and system health alerts | Prevent time sync failures | | Schedule automatic database updates | Keep categories current | | Backup configuration monthly | Quick restore after corruption |

What specific appear in your Warning log when you click apply?

If the system time on your Kerio Control appliance differs significantly from actual time, SSL/TLS handshakes with registration servers will fail. | Action | Purpose | |--------|---------| | Monitor

for a specific version of Kerio Control, or do you need help verifying your license status

Kerio Control applies its own rule set to traffic originating from the appliance (e.g., license checks, category updates). Enable SSH access in

Enable SSH access in .

Restart the underlying Kerio services or perform a system reboot to apply changes cleanly. Step 3: Verify and Re-Enable the Web Filter Module Direct Overview of the Core Causes

Remove the cache directory:

[URLFilter] Failed to activate: license not found [URLFilter] Cloud query failed: SSL certificate verification failed [URLFilter] Cannot connect to update server: Network unreachable [WebFilter] Categorization disabled: no valid license file

This comprehensive guide breaks down the root causes of this error and provides a step-by-step framework to resolve it permanently. Direct Overview of the Core Causes