If the Zvelo token used for authorization expires (after 21 days) or becomes corrupted, the system cannot categorize websites. Troubleshooting Steps: How to Fix
: Kerio Control sends periodic queries to reach update servers. If it fails 10 times in a row within 1 minute, it disables the filter. Invalid Authorization If the Zvelo token used for authorization expires
The Web Filter requires a specific active license module. If your core license is valid but the filter is "not activated," it may be a module-specific expiration. Invalid Authorization The Web Filter requires a specific
: Disable "Categorize each page regardless of URL rules" unless you need statistics – full categorization can decrease performance. This option should be enabled only if you intend to keep category statistics. This option should be enabled only if you
The Web Filter is a premium feature. If your license does not include it, or if the license has expired, the categorization engine will shut down.
Follow these steps in order to re-activate the categorization service. Step 1: Verify Subscription Status Navigate to the . Go to Content Filter > Applications and Web Categories . Check if "Enable Kerio Control Web Filter" is checked.
: Avoid using Google DNS (8.8.8.8) as the primary forwarder for categorization queries. Use Cloudflare (1.1.1.1) or OpenDNS instead.