If Kerio Control cannot resolve external domains, it cannot verify its license or download categorization updates. Note that this is the firewall's own DNS, not the DNS it hands out to local clients. Go to -> DNS .
When the integrated Zvelo authentication token expires, the warning logs state: DNS response 'FAILURE: Invalid authorization' to query... . If a standard license synchronization fails to clear this error, resetting the local update pointer forces the OS to re-fetch clean cryptographic tokens. Enable SSH Access
Follow these troubleshooting steps in order to resolve the issue. Step 1: Verify License Status and Force Activation If Kerio Control cannot resolve external domains, it
A firewall rule, upstream router, or ISP is blocking the specific ports or IPs Kerio needs to validate its status.
/opt/kerio/mailserver/konsole service categorization restart When the integrated Zvelo authentication token expires, the
Navigate to > Applications and Web Categories .
The Kerio Control Web Filter is an add-on subscription. If your Software Maintenance Agreement (SMA) or specific Web Filter license expires, the service shuts down. Enable SSH Access Follow these troubleshooting steps in
: Temporary packet drops or slow internet lines trigger the firewall's reliability safety threshold.
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If you are still experiencing issues with your Web Filter reactivation, please let me know: What of Kerio Control you are currently running?