How to Read v2rayN Logs: Common Errors and Troubleshooting Steps

Read the full error chain, not just the last line

v2rayN manages configuration, subscriptions, and proxy settings; the selected core handles the actual connection. Status messages in the main window and core output may come from different layers. A successful subscription update only means the configuration was retrieved. A core startup message doesn’t prove that the remote server is reachable.

Check the log or information area at the bottom of the main window. Note when a failure occurs, then expand that error to see its context. Menu names and wording can vary by version. This guide uses the Windows desktop app; before changing settings, check your actual configuration under Settings → Parameter settings rather than guessing from screenshots.

1. Keep test conditions consistent

   Choose one server and one webpage, and pause other apps that are retrying continuously. Note whether System proxy and TUN are enabled, and don’t switch between them while troubleshooting.

2. Find the first failure

   Note the current time, then reopen the target webpage once. Check only the errors around that attempt so you don’t mistake an earlier log entry for the current issue.

3. Keep the surrounding error details

   Keep a few lines before and after the error. Look for the destination address, port, and most specific underlying cause. Before sharing logs, redact subscription URLs, user IDs, and authentication details.

4. Change one thing at a time

   Change only one setting per test: port, DNS, server, or transport. Save, restart the core, and retry the same destination. Note whether the error changes.

Local listener failure: check the proxy port first

If the core exits as soon as it starts, don’t change the node yet. The app must first connect to the local proxy listener before it can reach a remote server. In logs, 127.0.0.1 is the local loopback address. The troubleshooting steps for “connection refused” differ completely depending on whether the error is at the local listener or the server.

Run the read-only query below in PowerShell. This example checks 10808; replace it with your local port if it’s different. If the first command returns nothing, no matching TCP listener was found at that time. It doesn’t check UDP or confirm remote connectivity.

Get-NetTCPConnection -LocalPort 10808 -State Listen -ErrorAction SilentlyContinue |
  Select-Object LocalAddress, LocalPort, OwningProcess

Get-NetTCPConnection -LocalPort 10808 -State Listen -ErrorAction SilentlyContinue |
  ForEach-Object { Get-Process -Id $_.OwningProcess }

Connection refused vs. timed out: tell an active rejection from no response

Once the local listener is working, check the remote address and port the log is trying to reach. A refused connection usually means a rejection was received; a timeout means the operation didn’t complete within the allotted time. Neither error alone tells you whether your account is valid, and not every timeout is a DNS issue.

DNS lookup failure: identify which domain failed

DNS translates domain names into IP addresses. The name that failed to resolve in the log could be the node’s server, the destination website, or the hostname of a DNS service. Identify the name before troubleshooting to avoid repeatedly changing DNS just because a webpage won’t load.

• Check Windows DNS: In PowerShell, run Resolve-DnsName -Name example.com to see whether system DNS resolution is working. When troubleshooting a node, query the actual hostname it uses.
• Check the core: Review its current DNS and routing settings. Successful system DNS resolution doesn’t mean the remote DNS server configured in the core is reachable.
• Don’t replace addresses blindly: Don’t copy a resolved IP address into every field of a TLS node. The server address, SNI, and HTTP Host may serve different purposes; follow the service provider’s requirements.

If only one destination website fails while the node server remains reachable, focus on that site’s DNS results, the route it matches, and the destination service. Routing rules decide which outbound connection handles traffic; they don’t automatically make every domain resolvable.

TLS handshake failures: check the time, server name, and transport settings

TLS can still fail after a TCP connection is established. TLS sets up a protected connection; proxy protocols such as VMess and VLESS have their own configuration requirements. A reachable port doesn’t mean the TLS handshake, transport, and proxy authentication have all succeeded.

EOF and connection reset by peer describe a connection that was closed; they aren’t specific authentication errors. A transport mismatch, incorrect WebSocket path, reverse proxy misconfiguration, or the destination service closing the connection can all cause similar messages. Check which stage failed instead of reinstalling the client just because you see EOF.

• For WebSocket, compare the path and Host with the server configuration. Don’t guess at capitalization or change path characters.
• For gRPC, verify the service name against the server configuration. Don’t reuse a WebSocket path.
• For VLESS or VMess, check that the protocol type, user ID, and related settings match. Save any required custom settings before updating the subscription.
• Make sure the selected core supports the current configuration. The v2rayN interface, core program, and subscription are separate components; updating one doesn’t automatically update the others.

No request in the logs: check the system proxy and routing entry point

If no matching request appears in the core when you open a webpage, the app may not be sending traffic to the client, or the current log level may simply omit access details. No log entry proves neither that the node is working nor that traffic is bypassing the proxy.

1. Check the proxy entry point

   In the v2rayN main window or tray menu, check the current status under System proxy. If you need the system proxy, select Set system proxy, then confirm that the address and port recorded in Windows match the local listener.

2. Check app settings

   See whether the browser or target app has its own direct connection setting, a different proxy port, or a proxy extension. An app’s own settings may not follow the system proxy.

3. Check the route

   Once a request reaches the core, check its outbound tag and the active routing rules. Traffic routed directly won’t automatically use a selected server.

4. Temporarily enable detailed logs

   Under Settings → Parameter settings, look for the log-level options. If needed, temporarily switch to debug, reproduce the issue once, then restore the previous level. Avoid keeping sensitive destination addresses in logs longer than necessary.

Common questions and what to include in a bug report

Before reporting the issue, make one final pass in order: confirm the local port is listening, the app is actually using the proxy, the server hostname resolves as expected, and the remote port is reachable. Then check TLS and proxy protocol settings. If you manage the server, check its listener, firewall, certificate, and error logs at the same time. If you use a subscription service, share the steps you’ve already confirmed with the provider; that’s more useful than simply saying “it timed out.”