Kerio Control Web Filter Is Not Activated Categorization Is Disabled Hot

Before fixing the problem, you must understand the architecture. Kerio Control uses a cloud-based URL Database (formerly McAfee, now partially proprietary and third-party) to categorize websites (e.g., “Social Networking,” “Streaming Media,” “Phishing”).

When you see "Web Filter is not activated, categorization is disabled," the firewall has lost communication with that database or the licensing server. The "hot" tag usually refers to a transient, high-priority failure state—often indicating a timeout or a license reset that requires immediate re-activation.

Why do developers use the "hot" flag? Kerio’s filter engine has three states:

When you see "categorization is disabled hot," the engine is screaming for attention. It has fresh cached data but cannot authenticate or download differential updates. In this state, all categories show as "Uncategorized," meaning your rules (e.g., "Block Adult Content") will not match anything. Before fixing the problem, you must understand the

This issue typically occurs due to one of the following:

Sometimes a simple toggle resets the activation state.

Observe the dashboard – the error should disappear within 2 minutes. When you see "categorization is disabled hot ,"

If all above steps fail, dive into the logs.

Web Filter activation requires that Kerio Control can resolve:

Go to Configuration → Network → DNS. Observe the dashboard – the error should disappear

Test resolution from the diagnostics shell:

dig update.gfi.com

Solution: Fix DNS forwarders or bypass internal DNS for Kerio's update domains.