The "Kerio Control Web Filter is not activated / categorization is disabled" issue typically stems from connectivity failures to backend servers or license validation errors. Primary Causes and Solutions
Tuesday, 10:20 AM
If you see "Invalid authorization" errors in your logs, the issue is likely with the Zvelo token renewal. The "Kerio Control Web Filter is not activated
URLs. If custom DNS servers (like Google 8.8.8.8) are slow, it can trigger a "DNS response timeout". Expired License:
Are you seeing a specific "Invalid Authorization" error in the logs, or is the checkbox just grayed out? Using Kerio Control Web Filter If custom DNS servers (like Google 8
The Web Filter requires a specific active license module. If your core license is valid but the filter is "not activated," it may be a module-specific expiration.
Kerio Control periodically checks its connection to update servers via DNS. If these checks fail 10 times in a row within one minute, it marks the Web Filter as "not reliable" and disables categorization. support.keriocontrol.gfi.com The "Wait" Fix If your core license is valid but the
Before fixing the issue, you must understand what is happening under the hood.