Ensure your Kerio Control Web Filter license is active. Without a valid subscription, the module defaults to a trial state and eventually disables itself.
Avoid using Google DNS (8.8.8.8) for Zvelo categorization as it can cause "Invalid Authorization" errors. Instead, use Cloudflare (1.1.1.1) or OpenDNS (208.67.222.222).
If your error log specifically mentions "Invalid Authorization," it likely means the has expired (tokens typically last 21 days). Ensure your Kerio Control Web Filter license is active
Ensure the value v4.url.zvelo.com is correctly set in the configuration file located at /opt/kerio/winroute/winroute.cfg .
Web Filter categorization disabled. Serial number: ko-197974 Instead, use Cloudflare (1
Do you need the specific to check your current license status or verify the winroute.cfg contents?
Kerio Control uses DNS queries to reach its update and categorization servers. If your ISP or current DNS configuration is slow or blocking these requests, the filter will deactivate. Web Filter categorization disabled
Sometimes a simple reboot after changing DNS settings is required to force a new token request. 3. Advanced SSH Fix (Disable Reliability Detection)
For categorization to work accurately on secure sites, ensure HTTPS Filtering (decrypt and filter) is enabled under Content Filter > HTTPS Filtering .