nats-io/nats-server · error

timeout waiting for service to go to state=%d

Error message

timeout waiting for service to go to state=%d

What it means

Windows ProcessSignal: after s.Control succeeded, the service did not reach the expected state (Stopped or Running) within the 10-second deadline despite 300ms polling. Indicates a slow or hung service — e.g. a stop that blocks on open connections or a reload that stalls.

Source

Thrown at server/signal_windows.go:100

	case CommandReload:
		cmd = svc.ParamChange
		to = svc.Running
	case commandLDMode:
		cmd = ldmCmd
		to = svc.Running
	default:
		return fmt.Errorf("unknown signal %q", command)
	}

	status, err := s.Control(cmd)
	if err != nil {
		return fmt.Errorf("could not send control=%d: %v", cmd, err)
	}

	timeout := time.Now().Add(10 * time.Second)
	for status.State != to {
		if timeout.Before(time.Now()) {
			return fmt.Errorf("timeout waiting for service to go to state=%d", to)
		}
		time.Sleep(300 * time.Millisecond)
		status, err = s.Query()
		if err != nil {
			return fmt.Errorf("could not retrieve service status: %v", err)
		}
	}

	return nil
}

View on GitHub (pinned to 3a66a489d2)

Solutions

1. Check the service's own logs to see why the transition stalled
2. Increase available time by reducing load (open client connections) before stopping
3. Force-kill the process if a clean stop is impossible: taskkill /F

When it happens

Trigger: Thrown at server/signal_windows.go:100 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• Timeouts: ETIMEDOUT, deadlines, and hung requests — what actually expires when a request times out.

AI-assisted analysis of nats-io/nats-server@3a66a489d2 (2026-09-02). Data as JSON: /api/errors/86fd0561aaa24f6c. Report an issue: GitHub.