XTLS/Xray-core · error

failed to build DNS configuration

Error message

failed to build DNS configuration

What it means

Error "failed to build DNS configuration" thrown in XTLS/Xray-core.

Source

Thrown at infra/conf/xray.go:594

	} else {
		logConfMsg = serial.ToTypedMessage(DefaultLogConfig())
	}
	// let logger module be the first App to start,
	// so that other modules could print log during initiating
	config.App = append([]*serial.TypedMessage{logConfMsg}, config.App...)

	if c.RouterConfig != nil {
		routerConfig, err := c.RouterConfig.Build()
		if err != nil {
			return nil, errors.New("failed to build routing configuration").Base(err)
		}
		config.App = append(config.App, serial.ToTypedMessage(routerConfig))
	}

	if c.DNSConfig != nil {
		dnsApp, err := c.DNSConfig.Build()
		if err != nil {
			return nil, errors.New("failed to build DNS configuration").Base(err)
		}
		config.App = append(config.App, serial.ToTypedMessage(dnsApp))
	}

	if c.Policy != nil {
		pc, err := c.Policy.Build()
		if err != nil {
			return nil, errors.New("failed to build policy configuration").Base(err)
		}
		config.App = append(config.App, serial.ToTypedMessage(pc))
	}

	if c.Reverse != nil {
		return nil, errors.PrintRemovedFeatureError(`"legacy reverse"`, `"VLESS Reverse Proxy"`)
		r, err := c.Reverse.Build()
		if err != nil {
			return nil, errors.New("failed to build reverse configuration").Base(err)
		}

View on GitHub (pinned to 7d214f8b09)

When it happens

Trigger: Thrown at infra/conf/xray.go:594 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of XTLS/Xray-core@7d214f8b09 (2026-08-15). Data as JSON: /api/errors/ea1e8c697da5e7f4. Report an issue: GitHub.