Kerio Control must be able to resolve https://kerio.com (or similar URLs). If DNS is broken, the filter cannot work. Go to .
When you see this warning in your (usually under Dashboard or Security logs), it means the system cannot reach the third-party classification services—specifically Zvelo —or the license authorization is failing. Common Symptoms: Users can access websites that should be blocked. Internet connectivity may be intermittent or slow. Kerio Control must be able to resolve https://kerio
The Web Filter requires a separate, active add-on license alongside the base Kerio Control license. When you see this warning in your (usually
Kerio Control relies on a cloud-based URL classification service to dynamically sort billions of web pages. When the firewall displays the "Categorization is Disabled" warning, it means the local Kerio Control engine cannot communicate with or authenticate against this cloud database. The underlying causes typically fall into three categories: The Web Filter requires a separate, active add-on
The error message occurs when the system can no longer reach its update/categorization servers, often due to DNS timeouts or authorization failures . Solution 1: Disable Reliability Detection (Technical Fix)
Mark paced the server room, the hum of the cooling fans doing little to soothe his nerves. The CEO was expecting a productivity report by noon, but the Kerio Control dashboard was mocking him with a persistent, red-lettered warning:
If the problem persists, you may be encountering a bug that has already been fixed in a newer version. GFI regularly releases patches to resolve these types of issues.