V2Ray FAQs and Connection Troubleshooting

First, distinguish the client interface from the core. V2Ray is part of the Project V ecosystem, V2Fly continues development in the related project, and Xray is a separate fork. The core handles protocols, routing and connections; v2rayN, v2rayNG and v2flyNG provide subscription management and settings interfaces. A client may import a configuration without the selected core supporting every field in it. To assess compatibility, check the protocol, transport and security settings, then confirm which core the client actually uses. Don't compare software names alone.

For desktop systems, start with v2rayN and choose the package for Windows, macOS or Linux. On Android, v2rayNG with the Xray core is usually the first choice; consider v2flyNG if an existing configuration specifically depends on V2Fly behavior. Choose based on your operating system, processor architecture and required features—not similar-sounding names. Before switching clients, export settings you want to keep and note your routing and per-app rules. Subscriptions can be imported again, but local changes usually won't transfer automatically.

A client reads configurations and establishes connections; installing one doesn't provide a remote service. You'll need a subscription URL, a share link or complete connection details, which you can then import into the client. A subscription provides access to a set of configurations; it's not a single node or an ordinary webpage URL. Identify what you have before choosing an import method. Don't mistake an account login or information page for a subscription URL. After importing, select a configuration and verify the connection in the logs and by testing access.

They belong to different configuration layers. VMess, VLESS and Trojan are proxy protocols; REALITY is a transport security mechanism often used with VLESS. A connection also depends on the transport, server name and authentication parameters, all of which must match the server. Changing the protocol name alone won't convert a configuration, and copying security settings from another node can cause problems. If a field isn't supported, first confirm which core you need, then check that the client preserved the parameters in the share link.

Make sure you copied the complete subscription URL, with no line breaks, extra spaces or punctuation added by a messaging app. Enter it in the subscription group and run an update. Import a single share link through the link or clipboard import option—not as a subscription update. Repeated attempts won't help if the response is a login page, error message or unsupported format. Opening the URL in a browser only confirms that it returned a response, not that the content is usable. Check that the subscription is valid and supported by your client, and don't share a full URL containing an access token publicly.

Check the update log first: parsing errors, connection timeouts, certificate errors and server access denials each need a different fix. Enable updates through the proxy only if the subscription URL requires a proxy to access and you already have a working configuration. On the first import, relying on a proxy can create a catch-22 because no working connection is available yet. Check your device's clock, network connection and subscription expiry before choosing an update route. After a successful update, confirm the target group and changed entries. Don't delete all existing configurations without a backup—you could lose the connection needed to restore the subscription.

If you've confirmed that your system uses the arm64 architecture, choose the arm64 package. If you're unsure about your device's architecture, consider the universal package, which includes multiple architectures. Most recent mainstream phones are suitable for arm64, but a phone's purchase date isn't a reliable guide, and processor support doesn't guarantee that the system uses the same architecture. If installation fails, check system requirements, available storage and whether an app with the same name but a different signing key is already installed. Back up your settings before changing download sources. Don't clear app data just to try another architecture; a universal package won't fix every compatibility issue.

TUN creates a virtual network interface and may change routes, so it needs more permissions than a regular local proxy. On desktop, grant administrator or service permissions as prompted by the client, then check that the virtual interface component works and doesn't conflict with other network tools. On Android, confirm the system's VPN connection permission and check whether another app is using the VPN connection. First verify that the configuration works in regular proxy mode, then test TUN separately. If it fails, note the first clear error. Changing DNS while repeatedly reinstalling can obscure the real permissions or interface issue.

A system proxy tells apps that follow system settings to send requests to the local proxy; some apps ignore this setting and need a proxy configured separately. Global routing usually means traffic that reaches the core defaults to a proxy outbound. It doesn't guarantee that traffic from every app reaches the core. TUN uses a virtual network interface to capture eligible traffic; its scope also depends on routing, exclusions and DNS settings. For everyday browsing, start with the system proxy and routing rules. Enable TUN only when you need to capture traffic from other apps, so you don't introduce too many variables at once.

TCPing mainly checks whether a TCP connection can be made to the target address and port. It doesn't verify proxy authentication, the full handshake or access to a target website. A real connection test sends an actual request using the current configuration and is also affected by the test URL, DNS, TLS and routing. So an open port doesn't prove the configuration works, and a failed real connection doesn't necessarily mean the remote port is unreachable. Check your system clock and configuration parameters, then review the logs from the test. If needed, try another stable test target for comparison. Test duration isn't a direct measure of download speed or how every website will perform.

Select a configuration, start the connection and confirm that the local inbound is listening before enabling the system proxy. Temporarily disable browser extensions that override proxy settings, then open a page that should use the proxy under your current rules. Check the client's connection records or temporarily enable access logs. If needed, compare the request's outbound and exit address, but don't judge by whether a single website loads: caching, direct-connection rules and a browser-specific proxy can all affect the result. When you're done, restore the previous log level and turn off test settings to avoid keeping unnecessary access records.

Start with your system's battery usage stats to distinguish sustained high traffic, frequent reconnections and background restrictions. If the connection drops as soon as the screen locks, check background activity permissions, battery optimization exemptions and power-saving mode. If it drops only when you switch networks, focus on reconnection logs. Per-app proxying can limit which apps are captured, but check whether you've selected the proxy list or bypass list so you don't exclude the app you need. Don't enable every background permission and capture all traffic at once. Change one setting at a time, then test with the screen locked, after switching networks and during normal use to compare battery life and stability.

Stop running repeated speed tests. Confirm that your device can access the internet normally, then check server address resolution, the target port and whether the configuration is still valid. Compare with a known working configuration to see whether one node or the entire group is failing. If the port is reachable but the handshake fails, check authentication details, server name and transport parameters. If every connection times out, check the firewall, network environment and whether the local core started correctly. In the logs, distinguish a timeout connecting to the remote server from a timeout reaching the test target. Save the specific error and steps that triggered it; that's more useful than noting only that it timed out.

Connected may only mean that the local proxy or the system's VPN interface started; it doesn't prove the remote handshake or webpage request succeeded. Check in order whether the app is using the proxy, which outbound the route selected, whether DNS resolved, and whether the remote server is available. If there's no matching request in the logs, check system proxy or per-app settings. If the request went direct, check rule order. If you see a domain resolution error, check DNS. You can compare against a known working configuration and simple rules temporarily, but don't delete the original configuration. Change one part at a time, then restore any routing rules you still need.

Check whether the local address and port in the system proxy match the values the client is actually listening on. Don't assume every installation uses the same port. See whether a browser extension, manual proxy setting or another proxy app is overriding it. If the client exits unexpectedly while the system still points to its stopped local port, your browser may lose network access. Restarting the client may clear the system proxy, or you can turn off the leftover manual proxy in system settings. Some business networks rely on a specific proxy configuration. Record the original values before changing anything, and don't remove settings required by your organization when restoring them.

Record the affected domains and logs from the same time, then look for resolution failures, unmatched rules or outbound connection errors. V2Ray's built-in DNS doesn't automatically handle every lookup made by the system. Browser Secure DNS, the system cache and TUN's DNS handling can all affect the path. If a domain is incorrectly routed direct, check rule order and the rule set. If the DNS server itself is unreachable, fix its connection route first. Randomly changing DNS isn't a reliable fix, and testing by IP alone doesn't replace a full check—certificates and site routing often depend on the domain name.