SSH into the box or access local console
: Use a client like PuTTY to SSH into your Kerio Control appliance. Execute the Fix :
Older versions of Kerio Control may hardcode obsolete URLs for categorization servers. GFI/Kerio periodically updates these backends. Go to > Advanced Options > Software Update . Check for the latest stable release. SSH into the box or access local console
Clear cache / reset web filter settings
Incorrect DNS forwarding settings or slow Internet link speeds can prevent communication with Kerio update and Zvelo categorization servers. 2. Resolution Steps A. Adjust DNS Forwarding (Recommended) Go to > Advanced Options > Software Update
Then re-download categories.
Even with a license, the service may be stopped or hung. Even with a license
Inspect outbound connectivity and firewall rules
Misconfiguration can make it seem like web filter is inactive.
Add the URL *.zvelo.com and point it to a reliable DNS provider like ( 1.1.1.1 ) or OpenDNS ( 208.67.222.222 ). Reboot the Kerio Control appliance to apply changes. B. Disable Reliability Detection via SSH