if _, err := idplugin.LookupConfig(s[config.IdentityPluginSubSys][config.Default],
			NewHTTPTransport(), xhttp.DrainBody, globalSite.Region()); err != nil {
			return err
		}
	case config.SubnetSubSys:
		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 {