The Web Filter relies heavily on DNS to communicate with the Zvelo servers. Incorrect DNS settings are a frequent cause of "Invalid Authorization" errors.
Kerio Control automatically disables the filter if it fails 10 consecutive DNS check queries within one minute, deeming the connection unreliable. The Web Filter relies heavily on DNS to
Web Filter categorization disabled. Serial number: ko-197974 Web Filter categorization disabled
The realization hit him—the system clock. Because of a recent power flick, the Kerio appliance had lost sync with the NTP server. It thought the year was 2010. The modern security certificates being sent by the Kerio cloud were "from the future" and therefore rejected as invalid. Mark didn't hesitate. He took three quick steps: It thought the year was 2010
If you're encountering the issue where the Kerio Control web filter is not activated and categorization is disabled, there are steps you can take to resolve this.