If the category is blocked (e.g., "Streaming Media"), the connection is dropped. Content rules based on categories are ignored.

A "not activated" or "disabled" Kerio Control web filter is a temporary, solvable problem, usually related to network reliability or licensing issues. By checking your licensing, confirming DNS stability, or disabling the reliability detection through SSH, you can restore full web categorization. Regular maintenance and ensuring that the firewall can reach the Zvelo servers are essential to preventing this issue from recurring.

If the license is valid but the categorization remains disabled, the local Web Filter database files may be corrupt. You can force Kerio to download a fresh copy. Navigate to . Uncheck the box that says Enable Kerio Control Web Filter . Click Apply to save the changes.

If your categorization is working but specific critical websites are blocked due to the error status, add temporary exceptions. Go to > Content Filter . Click Definitions > URL Groups .

Help you so you know when the filter fails in the future. Let me know which of these would be most helpful! Share public link

Sometimes the firewall simply loses sync with the Kerio registration servers, even if your license is valid. Go to . Click the Refresh button at the bottom of the page. Wait for the firewall to contact the Kerio servers. Check if the Web Filter status changes to "Active." 3. Verify DNS and Internet Connectivity

If the web filter was disabled due to a momentary ISP outage and won't re-enable itself, you can bypass the reliability check via SSH 1.2.2: Connect via SSH. Run: cd /opt/kerio/winroute

Are you seeing a specific error in the logs, or is the checkbox just grayed out? Using Kerio Control Web Filter

: The Kerio Control Web Filter is an optional module. If not licensed, it functions as a 30-day trial and automatically disables itself afterward.

Regularly check the Dashboard for alerts regarding web filter connectivity. Conclusion