user wants a long article about fixing the "Kerio Control web filter is not activated, categorization is disabled" error. I need to provide a comprehensive troubleshooting guide. I'll follow the search plan provided. search results from the initial plan have provided several promising leads. Result 0 appears to be a support article about resolving web filter categorization issues, result 1 discusses invalid authorization, result 2 covers license activation failures, and result 3 provides information on web filter licensing. I should open these to gather detailed information for the article. article "Resolving Web Filter Invalid authorization failures" provides a clear solution related to DNS settings and Zvelo tokens. "Warning Logs in Kerio Control" shows examples of the error messages. The license activation article explains connectivity and storage issues. The "Kerio Control Licensing Process" outlines optional components like the Web Filter. These are all relevant to the user's query. I should also search for information on how to enable the web filter and possibly about reliability detection. 0 seems to be about disabling reliability detection. This might be part of a workaround. I should open it. article provides a specific fix via SSH commands to disable reliability detection. Now I have a good set of sources covering the error's causes and solutions. I'll structure the article with the following sections: introduction, understanding the error and the importance of licensing, configuring DNS forwarding correctly, setting correct system time and connectivity, addressing token expiration with SSH modifications, disabling reliability detection as a temporary workaround, final checklist for verification, and a conclusion. I will cite the relevant sources throughout. message "Kerio Control web filter is not activated, categorization is disabled" in your logs indicates a breakdown in the web filtering service. This often appears alongside entries like DNS response 'FAILURE: Invalid authorization' to query... . This guide provides a structured, step-by-step approach to diagnosing and resolving the root cause, covering essential areas from basic licensing to advanced command-line fixes.
The Web Filter relies on fast and reliable DNS resolution. Using ISP-provided DNS can sometimes cause v4.url.zvelo.com requests to fail. Go to > DNS . Set your DNS servers to public, reliable DNS providers. Cloudflare: 1.1.1.1 and 1.0.0.1 OpenDNS: 208.67.222.222 and 208.67.220.220 . Apply settings and restart the Kerio Control engine. 3. Disable Reliability Detection (SSH Method) user wants a long article about fixing the
He verified the subscription was active. It was. search results from the initial plan have provided
nslookup updates.gfi.com curl -I https://download.kerio.com/control/categorization/latest.dat reliable DNS providers.
This error typically occurs when Kerio Control determines the Web Filter is "unreliable," usually because it failed to reach its categorization servers (Zvelo) multiple times.
/opt/kerio/ctrl/bin/kerio-control-web-filter --uninstall /opt/kerio/ctrl/bin/kerio-control-web-filter --install
| Symptom | Likely Fix | |---------|-------------| | Web filter not activated | Apply/renew Security Pack license | | Categorization disabled | Trigger manual DB update; fix internet access to update server | | Works for HTTP but not HTTPS | Enable SSL inspection | | Works for some users, not others | Check traffic rule web filter setting | | Never works after fresh install | Reinstall web filter component |