Project V: from a collection of tools to a client ecosystem
Ecosystem background: Project V grew around composable network proxy components, with V2Ray as one of its best-known core projects. In everyday use, “V2Ray” is often used broadly for related clients and protocol configurations. But the graphical app installed on a device, the core that handles network connections, and the configuration supplied by a server are different things. Understanding these three layers helps distinguish an interface name from a protocol name and explains why the same subscription may be parsed differently by different clients.
Scope of each component: a graphical client stores configurations, lets you choose servers, generates runtime parameters, and manages services. The core handles connections, transport, routing, and DNS logic. A toggle in the interface does not mean every core implements it using the same fields. Before following a tutorial, check which client, core, and connection method it covers, then match those details to your setup. Similar menu names do not mean you can copy every step as-is.
Xray and V2Fly: related branches, not interchangeable names
How they relate: V2Fly continues the community development of V2Ray, while Xray is another core branch built on related technical foundations. They share some protocol concepts and configuration structures, but evolve independently, so a new feature in one should not be assumed to work in the other. Check requirements such as REALITY against the actual capabilities of Xray. For existing V2Fly configurations, review the specific protocol, transport, and security fields before deciding whether to migrate.
Choosing a client: start with the server requirements, then choose a client and core that support those parameters. v2rayN suits centralized desktop management; v2rayNG provides a common way to use Xray configurations on Android; v2flyNG offers an option for the V2Fly core. This order describes a practical starting point, not a comparison of network quality. Connection performance also depends on server status, network path, device environment, and matching parameters; the client name alone cannot tell you how well it will work.
Open source: evaluate clients and cores separately
Open-source basics: v2rayN, v2rayNG, and v2flyNG are open-source clients; Xray and V2Fly also have their own open-source code and licensing terms. Open source means the code can be inspected, used, and modified under the applicable license. It does not mean every component uses the same license or that the graphical client and underlying core are published by the same maintainers. Before modifying, redistributing, or integrating components, read the license for each one instead of assuming a client's license covers all its dependencies.
Configuration responsibility: open-source status does not replace the need to understand your settings. Subscription links may contain access credentials, so hide links, server authentication details, and personal configuration directories before sharing screenshots. When asking for help, provide the error type, steps to reproduce, and runtime environment with sensitive fields removed; this is usually more useful than publishing an entire configuration. This site covers client selection and usage. Identify the client project, core project, and configuration source separately.
Updates: application updates are not subscription updates
What gets updated: client updates mainly affect the interface, configuration conversion, and service management; core updates affect protocol implementation and runtime behavior; subscription updates fetch server entries again from an existing link. Each addresses a different issue. If no new configurations appear, check the subscription link and update logs. If the core does not recognize a field, check its capabilities. If importing fails in the interface, check the client's format support. Repeatedly refreshing a subscription cannot add a missing core feature.
Order of changes: when an existing setup is stable, save the configuration and read the release notes before changing one component at a time. After an update, test a basic connection with the original server first, then check custom routing, DNS, and TUN. If you change the client, subscription, and routing setup together, it will be hard to identify the cause even if the connection returns. The home page does not use release frequency as a recommendation criterion. Find downloads on the downloads page, and setup instructions in the guides and advanced usage sections.
Protocol and security layers: check the full configuration for compatibility
How the fields fit together: VMess, VLESS, and Trojan are proxy protocols; transport describes how data is carried; TLS and REALITY settings relate to the security layer. A matching protocol name only means some requirements are similar; it does not guarantee that the full configuration is compatible. The address, port, identity fields, transport path, server name, and flow requirements must all match. An incorrect value in any one of these fields can let an import succeed but still prevent a connection.
Troubleshooting order: first check the system clock and server parameters, then use the logs to determine whether the issue is a parsing error, connection timeout, or handshake failure. For parsing errors, check the format and supported fields. For timeouts, check the local proxy and whether the destination is reachable. For handshake failures, check the security layer and server name. Do not switch protocols repeatedly without evidence or treat disabling security checks as a standard fix. Use the glossary to understand fields and the advanced guides to learn how rules work together.
Subscriptions and routing: connect first, then refine one layer at a time
Start with a minimal setup: for your first configuration, import one entry, select it, start the connection, and verify that it works. A status showing that the service has started only means the local process or service is running; it does not mean every app is using the proxy or that the remote handshake has completed. Confirm the result in a browser or target app before adding subscription groups, routing rules, and DNS optimizations. This gives you a clear baseline for troubleshooting.
Verify traffic routing: routing needs identifiable domain or address information, while DNS affects name resolution and rule matching. Changing only one side can make rules look correct without producing the expected matches. With FakeDNS, also confirm that your traffic-handling method preserves the mapping, and watch for compatibility issues in some apps. Record rules and logs before and after changes, and add exceptions only for specific needs. Do not assume someone else's full configuration is a suitable default for every device.