Kerio Control Web Filter Is Not Activated Categorization Is Disabled Work ((exclusive)) Jun 2026

However, administrators often encounter a frustrating scenario: the . When this occurs, the firewall essentially stops filtering web content, allowing users to access unauthorized sites and potentially exposing the network to security risks.

If the ping fails to resolve the hostname, your firewall has a DNS issue. Correct DNS Settings Navigate to > DNS .

Secure handshakes between your firewall and the Kerio activation servers will fail if the system time is off by more than a few minutes.

Reinstall Kerio Control preserving the configuration.

"It's not YouTube," Leo muttered, pulling up Kerio’s raw logs. The logs were a screaming kaleidoscope of IP addresses: 45% legitimate school traffic, 55% botnets, cryptominers, and zombie click-farms that had slipped in because no filter was there to blacklist known malicious domains. Correct DNS Settings Navigate to > DNS

Click (or re-register the current one).

Some Web Filter issues are resolved in newer releases. Check for updates and apply the latest stable version. Always review release notes for known Web Filter fixes.

5. Disable Reliability Detection (If Filter is Permanently Disabled)

Once unregistered, click or Register License , enter your credentials, and complete the wizard. "It's not YouTube," Leo muttered, pulling up Kerio’s

| Root Cause | Symptoms | Solution | |------------|----------|----------| | Expired License | Web Filter not activated after 30 days | Purchase and apply license | | DNS Issues | Categorization disabled, DNS timeout logs | Configure custom DNS for *.zvelo.com | | Unreliable Categorization | Web Filter disables intermittently | Disable reliability detection via SSH | | Invalid Authorization | Expired Zvelo token in logs | Check DiaServerUrl; reboot after DNS changes | | Manual Disabling | Web Filter checkbox unchecked | Enable Web Filter in Content Filter tab | | ISP Throttling | Slow internet with Web Filter on | Custom DNS forward *.zvelo.com to Google DNS |

I can provide specific terminal commands or log analysis steps based on your setup. Share public link

The Kerio Control Web Filter license or the main Kerio Control subscription has expired.

Navigate to > Applications and Web Categories . Categorization is Disabled"

: Restart the Kerio Control appliance to restore immediate internet access.

Use reliable public NTP servers like pool.ntp.org or ://google.com .

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