if _, err := subnet.LookupConfig(s[config.SubnetSubSys][config.Default], nil); err != nil {
			return err
		}
	case config.CallhomeSubSys:
		cfg, err := callhome.LookupConfig(s[config.CallhomeSubSys][config.Default])
		if err != nil {
			return err
		}
		// callhome cannot be enabled if license is not registered yet, throw an error.
		if cfg.Enabled() && !globalSubnetConfig.Registered() {

	globalLocalNodeNameHex string
	globalNodeNamesHex     = make(map[string]struct{})

	// The global subnet config
	globalSubnetConfig subnet.Config

	// The global callhome config
	globalCallhomeConfig callhome.Config

	// The global drive config
	globalDriveConfig drive.Config

	// Global server's network statistics
	globalConnStats = newConnStats()

	// Global HTTP request statistics