: An incorrectly set system date and time on the Kerio Control server can break HTTPS/TLS certificate validation, preventing the license validation and communication with cloud-based filtering services. A failed DNS lookup for the DiaServerUrl (e.g., v4.url.zvelo.com ) can also cause the authorization token (which expires every 21 days) to fail.
Verify that the checkbox for is explicitly checked. Click Apply to push the policy to all active interfaces.
The system disables categorization under three primary scenarios: : An incorrectly set system date and time
If expired, renew your seat count with GFI Software to restore the categorization infrastructure. Verifying the Fix
If your Web Filter continues to display as disabled after attempting the above troubleshooting steps, it may indicate a deeper routing issue or a firewall malfunction. If you would like, tell me more about your system: Click Apply to push the policy to all active interfaces
If your error log specifically mentions "Invalid Authorization," it likely means the has expired (tokens typically last 21 days).
Sometimes, internal firewall rules accidentally block the Kerio appliance from accessing the internet. Go to . If you would like, tell me more about
Is the issue occurring continuously, or is it ?
: The Web Filter requires a separate, active license. If your license has expired or is invalid, the module reverts to trial mode and eventually disables itself.
The error "Kerio Control Web Filter is not activated, categorization is disabled hot" is rarely a hardware failure. It is almost always a logical issue—license, DNS, time, or a version-specific bug.