Confirm that the checkbox for is explicitly checked. Click Apply at the bottom right corner of the dashboard. Verifying the Solution
Many administrators configure public DNS servers like Google ( 8.8.8.8 ) across their network, which can sometimes fail to parse the specific token requests sent to *.zvelo.com . Changing your custom DNS forwarding rules often fixes this authorization problem. Log in to the console. Navigate to the DNS configuration panel.
Ensure your Kerio Control Web Filter subscription is valid and has not expired. If it has lapsed, the filter will automatically revert to a trial mode or disable itself entirely after 30 days. 2. Check DNS Resolution and Connectivity
Allow these destinations from the Kerio Control appliance (not just LAN clients): Confirm that the checkbox for is explicitly checked
Occasionally, you might spot an Invalid Authorization entry within your Kerio Control error logs. This specifically points to an expired Zvelo key token, which natively expires and attempts to refresh every 21 days.
(if option exists in your version) Go to Configuration → Web Filter → Update → Clear Cache or Reset Database .
Are you seeing or "DNS response timeout" keywords inside your system Error Logs? Changing your custom DNS forwarding rules often fixes
Set the target forwarding DNS servers to alternative providers, such as Cloudflare ( 1.1.1.1 ) or OpenDNS ( 208.67.222.222 ).
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Ensure your Kerio Control Web Filter subscription is
Access the Kerio Control console via SSH (holding while clicking Status > System Health to enable it). Execute these commands:
Kerio Control uses DNS queries to reach its update and categorization servers. If your ISP or current DNS configuration is slow or blocking these requests, the filter will deactivate.
Enable SSH access in .