When something breaks, don't rush to swap nodes — read the log first. The lower half of v2rayN's main window is the live log, and you can raise it to “Debug” for more detail.

Common keywords

  • failed to start: address already in use: local port taken — change the port or kill the process holding it.
  • context deadline exceeded / i/o timeout: timed out reaching the server, usually a dead node or local network issue.
  • tls: handshake failure / certificate: TLS handshake failed — check SNI, certificate, clock, or whether the REALITY parameters are right.
  • rejected / invalid user: authentication failed — wrong UUID / password.
  • connection reset by peer: the far end reset the connection, possibly interference or a server policy.
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Enabling debug logs

Settings → Parameter settings, set the log level to debug and restart the proxy. Switch back to warning afterwards — debug writes a lot.

Before posting logs for help, redact the UUID, domains and IPs — they're effectively your account credentials.