If you are encountering the error your firewall has likely triggered a safety mechanism that pauses web filtering when it cannot reliably reach the categorization servers.
The Web Filter uses an external service (Zvelo) which requires a valid authorization token. These tokens expire every . If your DNS settings prevent the token from renewing, categorization will be disabled.
: Hold the Shift key while navigating to Status > System Health in the admin interface, then click Enable SSH . If you are encountering the error your firewall
: Do not use Google DNS (8.8.8.8) for all requests, as it can sometimes cause issues with Zvelo authentication.
This issue is typically caused by , expired authentication tokens , or network reliability checks failing multiple times in a row. Use the following guide to troubleshoot and implement workarounds. 1. Immediate Workaround: Disable Reliability Detection If your DNS settings prevent the token from
: Connect to your Kerio device via SSH (e.g., using PuTTY ). Run these commands :
If the filter is activated but still blocking legitimate sites, you can bypass the categorization engine for specific URLs. Using Kerio Control Web Filter This issue is typically caused by , expired
: If the online activation fails due to network issues, download the license file from the Kerio Product Registration page and use the Register Offline option in the Kerio Activation Wizard.