Project V is a technology ecosystem, not a single desktop program
Project V has grown into a technology ecosystem around proxy protocols, transports, routing rules, and core programs. The v2rayN, v2rayNG, and v2flyNG products users see are graphical clients: they provide the interface, manage subscriptions, generate configurations, and control the core. The core program invoked by the client actually handles inbounds, outbounds, protocols, and routing rules. Therefore, a client that opens successfully only proves that the interface layer works; it does not prove that the subscription, core configuration, or network interception is correct.
Once this relationship is clear, troubleshooting becomes more direct: for import failures, check the subscription URL and client parsing first; for core startup failures, inspect protocol fields, port conflicts, and logs; when the browser bypasses the proxy, check the system proxy or TUN; only when some domains use the wrong exit should you inspect routing rules and DNS. Blaming every failure on the node hides the real issue and often leads to unnecessary reinstalls.
V2Fly and Xray are related but independently evolving core families
V2Fly continues the core implementations and community maintenance associated with the Project V ecosystem, evolving common protocol, transport, and routing capabilities. Xray developed an independent core implementation on related technical foundations and expanded protocol combinations, transports, and configuration features. They share concepts such as inbounds, outbounds, routing, and DNS, but their support ranges, field details, and feature cadence are not identical.
Whether a configuration file or subscription node works depends on whether the core called by the client supports the relevant protocol and transport combination. When you see names such as VMess, VLESS, Trojan, or REALITY, verify not only the client name but also the core type and matching parameters. The terminology pages explain the boundaries between these concepts, while the configuration guides follow the real path from the client interface to the core configuration.
Open-source licensing supports review, forking, and sustainable maintenance
v2rayN, v2rayNG, v2flyNG, and the related cores are maintained through open-source projects and community collaboration. Open source means developers can review implementation details, configuration structures, and change histories, while different maintenance directions can continue from a shared technical foundation. For everyday users, the practical benefit is that documentation, issue records, and feature boundaries can be discussed publicly, making dependencies between clients and cores easier to verify.
Open source does not mean every configuration is automatically correct. Subscription contents still come from the relevant service, routing rules are determined by the user or client defaults, and system permissions are controlled by the local environment. Keep the software, third-party subscription, and personal configuration distinct instead of treating them as one judgment. This site organizes client access and configuration knowledge; it does not replace account, route, or support information from subscription services.
Treat updates as three separate tracks: client, core, and subscription
Client updates mainly affect the interface, platform compatibility, and configuration management. Core updates affect protocol implementations, transport capabilities, and runtime behavior. Subscription updates simply retrieve the node list again. These update types have different sources and schedules. Updating the client may not fix a subscription that cannot refresh, and repeatedly refreshing a subscription will not change core field compatibility. Identify the fault layer first, then choose what to update for more stable maintenance.
Before upgrading, record the current proxy mode, custom routing, and DNS settings. Afterward, verify basic connectivity with a minimal configuration before restoring TUN, process rules, or complex split routing. If behavior changes between versions, check the exact stage in the logs: subscription parsing, configuration generation, core startup, system proxy setup, DNS queries, and route matching each point to a different troubleshooting path.