Kerio Control — Web Filter Is Not Activated Categorization Is Disabled Hot ((install))

This is the most critical and likely cause.

This comprehensive troubleshooting guide explains why this critical error occurs and provides step-by-step instructions to restore your network security. Why the Kerio Control Web Filter Deactivates

/opt/kerio/mailserver/kerio-control restart This is the most critical and likely cause

Google's public DNS servers sometimes experience issues fetching Zvelo authentication tokens. Switching your DNS forwarding rules to Cloudflare or OpenDNS resolves this communication bottleneck. Log into your . Navigate to Configuration > DNS .

Kerio Control features an internal fail-safe. If the firewall sends 10 automatic DNS check queries to Kerio update servers and fails to receive a response within 1 minute, it will assume the web filter is unreliable and temporarily disable it to prevent internet outages. Switching your DNS forwarding rules to Cloudflare or

: Kerio Control sends automatic lookup queries to server update pools. If these queries fail 10 times consecutively within a single minute, the system Flags the Web Filter backend as unreliable and shuts down active categorization.

When the shows as "not activated" or "categorization is disabled," it typically stems from connectivity failures between the Kerio appliance and its update servers or authorization issues with the third-party categorization service, Zvelo . Common Fixes Kerio Control features an internal fail-safe

: Navigate to Configuration > Content Filter . Check your custom content rules; if they were grayed out during the outage, they will return to their functional colored status.

If the token fails to transfer from Kerio's internal servers, you may need to access the Kerio Control console via SSH .

The error typically indicates a licensing, connectivity, or service state issue. Following the diagnostic and resolution steps above will restore category-based web filtering. If unresolved, contact GFI/Kerio support with debug logs and license file details.