If your Kerio Control appliance cannot resolve external domain names, it cannot reach the activation servers.
The system disables categorization under three primary scenarios:
If Kerio Control cannot resolve the update server addresses, the synchronization fails. Go to .
Establish an to your Kerio Control appliance using a client like PuTTY. Log in using your root administrative credentials. Navigate to the installation directory by running: cd /opt/kerio/winroute Use code with caution. If your Kerio Control appliance cannot resolve external
Use the tool to see if the site is correctly identified.
Open the /opt/kerio/winroute/winroute.cfg file and confirm that the DiaServerUrl is accurately set to v4.url.zvelo.com . 4. Adjust Reliability Detection Timers
The Kerio Control Web Filter is not a free feature. It requires a specialized, paid license that is separate from the base firewall license. The most common scenario leading to this error is an expired or improperly applied license. Establish an to your Kerio Control appliance using
The error message indicates that your firewall cannot reach the cloud-based classification servers to analyze web traffic.
nslookup license.gfi.com
Restart the underlying Kerio services or perform a system reboot to apply changes cleanly. Step 3: Verify and Re-Enable the Web Filter Module Use the tool to see if the site is correctly identified
The categorization engine requires a specific, active subscription. If your core firewall license expires, or if the standalone Web Filter add-on subscription is allowed to lapse, the software reverts to evaluation mode and deactivates the web filtering module automatically after . Complete Step-by-Step Fix Guide
Check the box for and click Edit . Add the URL string: *.zvelo.com .
Ensure that is enabled.
Google's public DNS servers sometimes experience issues fetching Zvelo authentication tokens. Switching your DNS forwarding rules to Cloudflare or OpenDNS resolves this communication bottleneck. Log into your . Navigate to Configuration > DNS .
Ensure the module is actually enabled in the UI and that your license is active. The Web Filter is a separate module; if your 30-day trial or specific license has expired, the categorization options will automatically grey out.