Kerio Control Web Filter Is Not Activated Categorization Is Disabled Hot ^new^ Jun 2026

: Ensure your Kerio Control is using reliable DNS servers. It is recommended to use Cloudflare (1.1.1.1) OpenDNS (208.67.222.222) as custom DNS forwarding servers. Verify Web Filter Status Navigate to Content Filter > Applications and Web Categories Enable Kerio Control Web Filter is checked. Wait for Automatic Recovery

Erase localized firebase cache directories to free up system disk space. If you need help implementing these changes, let me know:

:Kerio Control disables the Web Filter if it fails 10 consecutive DNS checks within one minute.

The error message typically occurs because the firewall has failed to reach the external categorization servers (zvelo.com) multiple times, causing it to mark the service as unreliable and disable it . Immediate Fixes : Ensure your Kerio Control is using reliable DNS servers

: High latency or packet loss on your internet link can trigger the "unreliable" flag. Invalid Authorization

Or from GUI: .

Best Practices for Managing the "Lifestyle and Entertainment" Rule Wait for Automatic Recovery Erase localized firebase cache

“Kerio Control Web Filter is not activated. Categorization is disabled.”

Using standard public DNS (like Google 8.8.8.8) can sometimes lead to "Invalid Authorization" errors with the classification service.

dig update.gfi.com

The most frequent cause is a license issue. The Web Filter category database is a premium service.

Sometimes a simple toggle resets the activation state.