Verify your has not expired; if it has, the filter will stop receiving updates and eventually deactivate.
Based on official Kerio Control support documentation, this issue is typically triggered by one of several underlying problems: Verify your has not expired; if it has,
Log back into the web interface, navigate to , and click Check for Update . Preventing Future Web Filter Deactivations You can force it back into service by
If the DNS and connectivity issues are intermittent (e.g., a temporary ISP problem), the firewall may have disabled itself and not recovered. You can force it back into service by disabling the automatic reliability check. The Web Filter relies heavily on your firewall's
Resolving this error requires a systematic approach. Start with the most common (licensing) and then move through each potential cause.
The Web Filter relies heavily on your firewall's ability to reach update servers (such as v4.url.zvelo.com ) to download categorization databases and authorizations. If the firewall experiences DNS lookup timeouts, it will flag the web filter as unreliable and disable it.