Open-source licenses and configuration sources
All three graphical clients are open-source software, with source code distributed under their respective project licenses. The V2Fly and Xray core code is licensed under MPL 2.0; check each client, dependency, and bundled resource for its own license terms. Open-source licenses govern how code can be used, modified, and distributed. They don’t mean subscription services are provided by the same projects, and they don’t identify who operates a server or how it handles data.
Subscription URLs often contain access credentials and should be treated as sensitive information. When sharing troubleshooting screenshots, hide the full URL, user identifiers, and authentication parameters. Logs may also include server domains and connection destinations, so review them before posting. If a configuration asks you to disable certificate verification, first check the system time, certificate domain, and SNI. Don’t lower verification requirements just to dismiss a warning.
A graphical client applies the configuration you import, so the source of that configuration and local permissions matter too. Allowing local network connections, enabling a virtual network adapter, and automatically updating subscriptions all have specific effects. Enable only what you currently need, and keep track of why you changed it; this is easier to maintain than turning everything on at once.
Update types and troubleshooting order
Client updates, core updates, and subscription updates are three different things. A client update changes the interface and configuration management; a core update affects protocol support and network behavior; a subscription update retrieves server information again from its source. If the server list is empty, check subscription retrieval and filters before reinstalling the client. If the interface opens but the core won’t start, check permissions, port conflicts, and core logs.
Troubleshoot connections in a consistent order: verify your local network, confirm the subscription updated successfully, select a server with complete parameters, start a standard proxy, and test with a browser that follows the system proxy. If the standard proxy works but TUN doesn’t, focus on the virtual network adapter, DNS, and routing. If both fail, check the server status, system time, and authentication parameters first. Change one variable at a time and compare the logs before and after.
Back up your configuration before upgrading. After the upgrade, retest your existing setup before trying new features. Menu names in older guides may differ from the current interface, so look for the feature rather than an exact button label. For platform-specific steps and troubleshooting scenarios, see the Complete Client Installation Guide. If you’re already having connection issues, go straight to the Troubleshooting section and narrow down the cause by symptom.