The Web Filter uses SSL/TLS certificates to communicate with categorization servers. If your Kerio Control system time is incorrect, the certificate validation will fail. Go to .
Check for updates and ensure you are running the most recent build compatible with your license. Summary Checklist Potential Cause Renew SMA or Web Filter subscription. Time Sync Issue Enable NTP and verify the correct Time Zone. DNS Failure Set Kerio to use 8.8.8.8 for system resolution. Server Timeout The Web Filter uses SSL/TLS certificates to communicate
Here is a comprehensive guide to troubleshooting and fixing this issue. 1. Verify License Status and Maintenance Check for updates and ensure you are running
How to Fix "Kerio Control Web Filter is Not Activated, Categorization is Disabled" DNS Failure Set Kerio to use 8
Click Update License Info to force the appliance to check in with the GFI servers. 2. Check DNS Resolution on the Firewall
Ensure your Kerio Control is using reliable DNS servers (like 8.8.8.8 or 1.1.1.1) under Configuration > DNS . 3. Clear the Web Filter Cache
Sometimes the local database or cache becomes corrupted, leading the system to believe the service is inactive. Navigate to . Uncheck Enable Kerio Control Web Filter . Click Apply . Wait 30 seconds, re-check the box, and click Apply again.