Choose your next step based on what you see
Subscription update failed: First distinguish a download timeout from a certificate or parsing error. Confirm the provider returned config content rather than a login page, then adjust the update interval or try updating through the proxy if needed. See subscription update troubleshooting.
Connected, but webpages won't load: Check whether requests appear in the Connections list, then check the system proxy, port conflicts, proxy selection, and DNS in order. A lit connection button only indicates that the service may have started; it doesn't mean the destination is reachable. See the webpage loading troubleshooting checklist.
Custom rules disappeared after a config update: A remote subscription may replace the original file. Use the client's override, merge, or extension feature to preserve local changes, and confirm the order in which they're applied. For a maintainable config structure, read the complete guide, from basics to advanced configuration.
You still can't connect after closing the client: Check whether the system still has a proxy pointing to a local port and whether virtual interfaces shut down cleanly. Restore basic system networking first, then restart the client. Find help with fundamentals, installation, configuration, and troubleshooting by symptom on the FAQ page.