XTLS/Xray-core · error

failed to build fake DNS configuration

Error message

failed to build fake DNS configuration

What it means

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

Source

Thrown at infra/conf/xray.go:619

		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)
		}
		config.App = append(config.App, serial.ToTypedMessage(r))
	}

	if c.FakeDNS != nil {
		r, err := c.FakeDNS.Build()
		if err != nil {
			return nil, errors.New("failed to build fake DNS configuration").Base(err)
		}
		config.App = append([]*serial.TypedMessage{serial.ToTypedMessage(r)}, config.App...)
	}

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

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

View on GitHub (pinned to 7d214f8b09)

When it happens

Trigger: Thrown at infra/conf/xray.go:619 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/2512ba561cf43552. Report an issue: GitHub.