diff --git a/tests/pdctl/config/config_test.go b/tests/pdctl/config/config_test.go
index a1319fc9530b..b708abcabd50 100644
--- a/tests/pdctl/config/config_test.go
+++ b/tests/pdctl/config/config_test.go
@@ -15,6 +15,7 @@ package config_test
 
 import (
 	"encoding/json"
+	"strings"
 	"testing"
 
 	"github.com/coreos/go-semver/semver"
@@ -96,6 +97,10 @@ func (s *configTestSuite) TestConfig(c *C) {
 	c.Assert(json.Unmarshal(output, &clusterVersion), IsNil)
 	c.Assert(clusterVersion, DeepEquals, svr.GetClusterVersion())
 
+	args2 = []string{"-u", pdAddr, "config", "set", "namespace", "ts1", "region-schedule-limit", "128"}
+	_, output, err = pdctl.ExecuteCommandC(cmd, args2...)
+	c.Assert(err, IsNil)
+	c.Assert(strings.Contains(string(output), "Failed"), IsTrue)
 	// config show namespace <name> && config set namespace <type> <key> <value>
 	args = []string{"-u", pdAddr, "table_ns", "create", "ts1"}
 	_, _, err = pdctl.ExecuteCommandC(cmd, args...)
diff --git a/tools/pd-ctl/pdctl/command/config_command.go b/tools/pd-ctl/pdctl/command/config_command.go
index 6cf2505a5758..a58e356995b7 100644
--- a/tools/pd-ctl/pdctl/command/config_command.go
+++ b/tools/pd-ctl/pdctl/command/config_command.go
@@ -301,7 +301,7 @@ func setNamespaceConfigCommandFunc(cmd *cobra.Command, args []string) {
 	prefix := path.Join(namespacePrefix, name)
 	err := postConfigDataWithPath(cmd, opt, val, prefix)
 	if err != nil {
-		cmd.Printf("Failed to set namespace:%s config: %s\n", name, err)
+		cmd.Printf("Failed to set namespace: %s error: %s\n", name, err)
 		return
 	}
 	cmd.Println("Success!")
diff --git a/tools/pd-ctl/pdctl/command/global.go b/tools/pd-ctl/pdctl/command/global.go
index 733455258fe6..e1ee87734b5a 100644
--- a/tools/pd-ctl/pdctl/command/global.go
+++ b/tools/pd-ctl/pdctl/command/global.go
@@ -77,8 +77,10 @@ func doRequest(cmd *cobra.Command, prefix string, method string,
 		o(b)
 	}
 	var resp string
-	var err error
-	tryURLs(cmd, func(endpoint string) error {
+
+	endpoints := getEndpoints(cmd)
+	err := tryURLs(cmd, endpoints, func(endpoint string) error {
+		var err error
 		url := endpoint + "/" + prefix
 		if method == "" {
 			method = http.MethodGet
@@ -113,7 +115,7 @@ func dail(req *http.Request) (string, error) {
 		if err != nil {
 			return "", err
 		}
-		return fmt.Sprintf("[%d] %s", resp.StatusCode, msg), nil
+		return "", errors.Errorf("[%d] %s", resp.StatusCode, msg)
 	}
 
 	content, err := ioutil.ReadAll(resp.Body)
@@ -128,13 +130,8 @@ type DoFunc func(endpoint string) error
 
 // tryURLs issues requests to each URL and tries next one if there
 // is an error
-func tryURLs(cmd *cobra.Command, f DoFunc) {
-	addrs, err := cmd.Flags().GetString("pd")
-	if err != nil {
-		cmd.Println("get pd address failed, should set flag with '-u'")
-		os.Exit(1)
-	}
-	endpoints := strings.Split(addrs, ",")
+func tryURLs(cmd *cobra.Command, endpoints []string, f DoFunc) error {
+	var err error
 	for _, endpoint := range endpoints {
 		var u *url.URL
 		u, err = url.Parse(endpoint)
@@ -156,9 +153,19 @@ func tryURLs(cmd *cobra.Command, f DoFunc) {
 		}
 		break
 	}
+	if len(endpoints) > 1 && err != nil {
+		err = errors.Errorf("after trying all endpoints, no endpoint is available, the last error we met: %s", err)
+	}
+	return err
+}
+
+func getEndpoints(cmd *cobra.Command) []string {
+	addrs, err := cmd.Flags().GetString("pd")
 	if err != nil {
-		cmd.Println("after trying all endpoints, no endpoint is available, the last error we met:", err)
+		cmd.Println("get pd address failed, should set flag with '-u'")
+		os.Exit(1)
 	}
+	return strings.Split(addrs, ",")
 }
 
 func printResponseError(r *http.Response) error {
@@ -174,7 +181,8 @@ func postJSON(cmd *cobra.Command, prefix string, input map[string]interface{}) {
 		return
 	}
 
-	tryURLs(cmd, func(endpoint string) error {
+	endpoints := getEndpoints(cmd)
+	tryURLs(cmd, endpoints, func(endpoint string) error {
 		url := endpoint + "/" + prefix
 		r, err := dialClient.Post(url, "application/json", bytes.NewBuffer(data))
 		if err != nil {