Kerio Control uses Zvelo to categorize websites. If the service fails to get updates, it disables categorization. DNS Resolution Issues: Web Filter needs to reach *.zvelo.com
: A full disk can prevent the license file from saving. Use SSH to check disk space and clear cache files in /var/lib/firebase if necessary. 4. Troubleshooting Miscategorized or Blocked Sites Kerio Control uses Zvelo to categorize websites
Reinstall Kerio Control preserving the configuration. Use SSH to check disk space and clear
Leo leaned back. The Kerio box hummed quietly. It wasn't fixed. It was working —despite being broken. And sometimes, that’s the best a sysadmin can hope for. Leo leaned back
Leo stared at the blinking green cursor on his terminal, the words "Kerio Control: Web Filter not activated. Categorization is disabled." burning like a warning flare.
If the issue persists after following the steps above, collect debug logs ( Web Filter → Diagnostics → Create debug log ) and contact GFI Support, referencing “Web Filter module inactive – categorization disabled.”