Kerio Control Web Filter Is Not Activated Categorization Is Disabled Work ^hot^ Jun 2026

: Authorization tokens for categorization expire every 21 days. If they fail to renew due to blocked traffic, categorization will disable.

: An "Invalid Authorization" error often occurs if an expired Zvelo key token (which lasts 21 days) is used.

* Set custom DNS forwarding for .zvelo.com :

This is the first and most crucial step. The Web Filter requires a valid subscription. : Authorization tokens for categorization expire every 21

: Kerio Control performs automatic DNS checks to reach update servers. If 10 consecutive queries fail within one minute, the system marks the Web Filter as "not reliable" and disables categorization.

It was a hack, a Frankenstein solution. But when he hit "Apply," the terminal blinked once.

By following these recommendations, organizations can ensure a more secure and controlled online environment. * Set custom DNS forwarding for

Kerio Control contacts external cloud servers (powered by Cyren or Webroot, depending on your version) to categorize URLs. If the firewall cannot resolve these server addresses, it assumes the service is disabled.

What is the current listed on your dashboard license tile?

prevents ISP DNS throttling when the Web Filter makes many requests to Zvelo's database. To configure: If 10 consecutive queries fail within one minute,

A sample warning log entry may appear as:

If the Web Filter is active but incorrectly categorizing websites, you can: