Enable inside the Kerio dashboard via Advanced Options > System Configuration .
Have you checked your for "DNS response timeout" or "Invalid Authorization" to see exactly why it's dropping?
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 Enable inside the Kerio dashboard via Advanced Options
A specific performance degradation bug in version can cause system-wide stability problems, including DNS resolution failures for the web filter.
Alternatively, via CLI:
If you want, I can produce a tailored checklist or step-by-step script for your specific Kerio Control version and environment—tell me the appliance OS/version, whether you use cloud categorization, and any recent changes.
If the web interface toggle does not work, you can manually delete the corrupted database files using an SSH terminal. If the web interface toggle does not work,
Kerio Control needs to "call home" to categorize websites in real-time. If your firewall cannot reach the Kerio update servers, it will disable the filter to prevent network lag. Go to > System Health .
Kerio Control features an internal fail-safe. If the firewall sends 10 automatic DNS check queries to Kerio update servers and fails to receive a response within 1 minute, it will assume the web filter is unreliable and temporarily disable it to prevent internet outages. via CLI: If you want
Ensure the value v4.url.zvelo.com is correctly set in the configuration file located at /opt/kerio/winroute/winroute.cfg .