Kerio Control Web Filter Is Not Activated Categorization Is Disabled Work High Quality -

Frequent, severe, and rapid DNS failures (10+ times in 1 minute) cause the system to mark the service as unreliable 1.2.2.

Before contacting support, gather:

Ensure your firewall is using stable upstream DNS servers (e.g., Google DNS: 8.8.8.8 / 8.8.4.4 or Cloudflare: 1.1.1.1 ).

How to Fix "Kerio Control Web Filter is Not Activated, Categorization is Disabled"

Test connectivity via the firewall CLI or the built-in diagnostic tools () to verify the appliance can ping external WAN addresses. 3. Review Traffic Rules for Update Blockages Frequent, severe, and rapid DNS failures (10+ times

The error "Kerio Control Web Filter is not activated / categorization is disabled"

If categorization is disabled , the appliance cannot query the cloud. Consequently, no website receives a category, and all content rules dependent on categories fail silently.

If the logs point to DNS timeouts and you are sure your network connectivity is stable, you can disable the reliability detection mechanism that is automatically disabling the Web Filter.

If your internet is working but the filter remains disabled, you can manually reset the internal "reliability" check via the SSH console. If the logs point to DNS timeouts and

Open the to check for transient network drops that might keep disabling the service throughout the day. 🔍 Permanent Workarounds While Troubleshooting

Ensure the status shows as active and has not expired.

What is the shown on your license dashboard?

: Temporarily route your WAN DNS forwarders through a secure upstream provider like Cisco Umbrella or CleanBrowsing to filter out bad categories at the DNS level. no website receives a category

The specific appearing in your Kerio Control Error log tab.

Check the option in the firewall rules. 4. Fix "Invalid Authorization" (Zvelo Key Expired)

If you are running an older, unpatched version of Kerio Control (prior to version 9.4.2), you might be affected by the shutdown of Cyren, the legacy vendor Kerio used for URL categorization.