diff --git a/cmd/ck-server/ck-server.go b/cmd/ck-server/ck-server.go
index 2ca1402..c6fc10d 100644
--- a/cmd/ck-server/ck-server.go
+++ b/cmd/ck-server/ck-server.go
@@ -256,6 +256,9 @@ func main() {
 	}
 
 	if !pluginMode && len(sta.BindAddr) == 0 {
+		https, _ := net.ResolveTCPAddr("tcp", ":443")
+		http, _ := net.ResolveTCPAddr("tcp", ":80")
+		sta.BindAddr = []net.Addr{https, http}
 		log.Fatalf("bind address cannot be empty")
 	}
 
diff --git a/example_config/ckserver.json b/example_config/ckserver.json
index 42220f2..5b8eb8c 100644
--- a/example_config/ckserver.json
+++ b/example_config/ckserver.json
@@ -20,7 +20,7 @@
   "BypassUID": [
     "1rmq6Ag1jZJCImLBIL5wzQ=="
   ],
-  "RedirAddr": "204.79.197.200:443",
+  "RedirAddr": "204.79.197.200",
   "PrivateKey": "EN5aPEpNBO+vw+BtFQY2OnK9bQU7rvEj5qmnmgwEtUc=",
   "AdminUID": "5nneblJy6lniPJfr81LuYQ==",
   "DatabasePath": "userinfo.db",
diff --git a/internal/server/state.go b/internal/server/state.go
index e878a75..eefa14b 100644
--- a/internal/server/state.go
+++ b/internal/server/state.go
@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"github.com/cbeuw/Cloak/internal/server/usermanager"
+	"github.com/sirupsen/logrus"
 	"io/ioutil"
 	"net"
 	"strings"
@@ -93,7 +94,8 @@ func (sta *State) ParseConfig(conf string) (err error) {
 
 	sta.RedirAddr, err = net.ResolveIPAddr("ip", preParse.RedirAddr)
 	if err != nil {
-		return fmt.Errorf("unable to resolve RedirAddr: %v", err)
+		logrus.Error("If RedirAddr contains a port number, please remove it.")
+		return fmt.Errorf("unable to resolve RedirAddr: %v. ", err)
 	}
 
 	for _, addr := range preParse.BindAddr {