Stage four
Verify the connection and keep logs
After enabling the proxy, open a familiar webpage first to confirm domain resolution and connectivity, then test apps that require the proxy. A connected status only means the local proxy service has started; it does not guarantee that the remote node, DNS, and routing rules are working correctly.
When requests time out or pages fail to load, check in order whether the system proxy is active, the current node works, the subscription is up to date, and the device time is accurate; then review the error log. Keeping the log from the first failure is more useful for diagnosis than repeatedly changing many settings.