Kerio Control Web Filter Is Not Activated Categorization Is Disabled Work -

Before troubleshooting the network, ensure your subscription is active. Go to > License . Check the expiration date of the Web Filter module. If expired, renew the license. 2. Fix DNS Configuration

Note: This will restart the Kerio Control service and may cause a brief internet interruption.

This indicates that the Kerio Control appliance cannot reach the web categorization servers. If expired, renew the license

If you see "Invalid Authorization" in logs:

:

The Web Filter requires a specific active license; without it, the module behaves as a trial and will automatically disable after 30 days.

Ensure there is a rule allowing the host itself to access the internet via HTTP/HTTPS (ports 80 and 443). This indicates that the Kerio Control appliance cannot

Logs provide the most specific evidence of what's failing.

prevents ISP DNS throttling when the Web Filter makes many requests to Zvelo's database. To configure: " Leo muttered

: Kerio Control performs automated DNS checks to verify connectivity to update servers. If these queries fail 10 times consecutively within one minute, the system marks the Web Filter as "unreliable" and disables it.

"It's not YouTube," Leo muttered, pulling up Kerio’s raw logs. The logs were a screaming kaleidoscope of IP addresses: 45% legitimate school traffic, 55% botnets, cryptominers, and zombie click-farms that had slipped in because no filter was there to blacklist known malicious domains.