Once you have performed the steps above, verify the system is working:

The student’s query hit the main server, then bounced to an ad network, then to a CDN in Moldova, then back. The round trip took 14 seconds. Ms. Albright’s smartboard froze, displaying a spinning wheel of death over a pixelated image of a Roman aqueduct.

The error typically occurs when the firewall loses communication with its categorization servers (Zvelo), or if the special module license has lapsed. Common Fixes Check Licensing:

nslookup categorization.gfi.com

Web Filter categorization disabled. Serial number: ko-197974

Follow these steps to resolve the "Categorization is Disabled" status.