This phrase likely describes a problem state in Kerio Control where the web filtering feature is not functioning because URL categorization is disabled or unavailable. Below is a full-length, structured explanation covering possible causes, effects, diagnostics, and step-by-step remediation options.
Web Filter categorization disabled. Serial number: ko-197974 Explanation: "Kerio Control web filter is not activated;
Through years of troubleshooting Kerio installations, these five culprits account for 99% of these errors: Admin UI: System > License (or Activation) —
: Ensure your Kerio Control is using reliable DNS servers. It is recommended to use Cloudflare (1.1.1.1) OpenDNS (208.67.222.222) as custom DNS forwarding servers. Verify Web Filter Status Navigate to Content Filter > Applications and Web Categories Enable Kerio Control Web Filter is checked. Wait for Automatic Recovery The Most Common Causes (Ranked by Frequency) Through
If the license is valid and the internet is working, the service may be stuck.
Invalid Authorization: This often stems from an expired Zvelo token (which typically expires after 21 days). If the appliance cannot fetch a new token from Kerio’s internal servers, the filter remains inactive.
: High latency or packet loss on your internet link can trigger the "unreliable" flag. Invalid Authorization