if err != nil {
		if _, ok := err.(BackendDown); ok {
			return err
		}
		return tierPermErr{
			Op:  tierPut,
			Err: err,
		}
	}

	r, err := w.Get(ctx, probeObject, "", WarmBackendGetOpts{})
	xhttp.DrainBody(r)
	if err != nil {
		if _, ok := err.(BackendDown); ok {
			return err
		}
		switch {
		case isErrBucketNotFound(err):
			return errTierBucketNotFound
		case isErrSignatureDoesNotMatch(err):

		NewHTTPTransport(), xhttp.DrainBody, globalSite.Region())
	if err != nil {
		iamLogIf(ctx, fmt.Errorf("Unable to initialize AuthNPlugin: %w", err), logger.WarningKind)
	}

	setGlobalAuthNPlugin(idplugin.New(GlobalContext, authNPluginCfg))

	authZPluginCfg, err := polplugin.LookupConfig(s, GetDefaultConnSettings(), xhttp.DrainBody)
	if err != nil {