[Kerio Control Firewall] --(DNS Queries Overload/Blocked)--> [ISP DNS Server] | (Dropped Request) | [Cloud Database (Zvelo)]
Click or Update License Info to force the firewall to re-authenticate with the parent servers. Step 2: Check Kerio Control's System DNS Settings
If your Kerio Control is behind another router or ISP firewall, it must be allowed to communicate with the activation servers.
Check for the absence of "Invalid authorization" or "Unable to categorize" entries.