diff --git a/client/admin.go b/client/admin.go
index fdef060f..b3485af2 100644
--- a/client/admin.go
+++ b/client/admin.go
@@ -15,7 +15,6 @@
 package client
 
 import (
-	"fmt"
 	"net"
 	"net/http"
 	"time"
@@ -31,7 +30,7 @@ var (
 	httpServerWriteTimeout = 10 * time.Second
 )
 
-func (svr *Service) RunAdminServer(addr string, port int) (err error) {
+func (svr *Service) RunAdminServer(address string) (err error) {
 	// url router
 	router := mux.NewRouter()
 
@@ -51,7 +50,6 @@ func (svr *Service) RunAdminServer(addr string, port int) (err error) {
 		http.Redirect(w, r, "/static/", http.StatusMovedPermanently)
 	})
 
-	address := fmt.Sprintf("%s:%d", addr, port)
 	server := &http.Server{
 		Addr:         address,
 		Handler:      router,
diff --git a/client/service.go b/client/service.go
index c1627022..3033ee2a 100644
--- a/client/service.go
+++ b/client/service.go
@@ -129,7 +129,8 @@ func (svr *Service) Run() error {
 			return fmt.Errorf("Load assets error: %v", err)
 		}
 
-		err = svr.RunAdminServer(svr.cfg.AdminAddr, svr.cfg.AdminPort)
+		address := net.JoinHostPort(svr.cfg.AdminAddr, strconv.Itoa(svr.cfg.AdminPort))
+		err = svr.RunAdminServer(address)
 		if err != nil {
 			log.Warn("run admin server error: %v", err)
 		}
diff --git a/conf/frpc_full.ini b/conf/frpc_full.ini
index 01432cc0..be299b10 100644
--- a/conf/frpc_full.ini
+++ b/conf/frpc_full.ini
@@ -2,6 +2,7 @@
 [common]
 # A literal address or host name for IPv6 must be enclosed
 # in square brackets, as in "[::1]:80", "[ipv6-host]:http" or "[ipv6-host%zone]:80"
+# For single "server_addr" field, no need square brackets, like "server_addr = ::".
 server_addr = 0.0.0.0
 server_port = 7000
 
diff --git a/conf/frps_full.ini b/conf/frps_full.ini
index 2f00f5c3..a704cf4f 100644
--- a/conf/frps_full.ini
+++ b/conf/frps_full.ini
@@ -2,6 +2,7 @@
 [common]
 # A literal address or host name for IPv6 must be enclosed
 # in square brackets, as in "[::1]:80", "[ipv6-host]:http" or "[ipv6-host%zone]:80"
+# For single "bind_addr" field, no need square brackets, like "bind_addr = ::".
 bind_addr = 0.0.0.0
 bind_port = 7000
 
diff --git a/pkg/util/net/kcp.go b/pkg/util/net/kcp.go
index 2788b5f8..e9e0b126 100644
--- a/pkg/util/net/kcp.go
+++ b/pkg/util/net/kcp.go
@@ -27,8 +27,8 @@ type KCPListener struct {
 	closeFlag bool
 }
 
-func ListenKcp(bindAddr string, bindPort int) (l *KCPListener, err error) {
-	listener, err := kcp.ListenWithOptions(fmt.Sprintf("%s:%d", bindAddr, bindPort), nil, 10, 3)
+func ListenKcp(address string) (l *KCPListener, err error) {
+	listener, err := kcp.ListenWithOptions(address, nil, 10, 3)
 	if err != nil {
 		return l, err
 	}
diff --git a/server/dashboard.go b/server/dashboard.go
index 7af9df27..edac675e 100644
--- a/server/dashboard.go
+++ b/server/dashboard.go
@@ -15,7 +15,6 @@
 package server
 
 import (
-	"fmt"
 	"net"
 	"net/http"
 	"time"
@@ -32,7 +31,7 @@ var (
 	httpServerWriteTimeout = 10 * time.Second
 )
 
-func (svr *Service) RunDashboardServer(addr string, port int) (err error) {
+func (svr *Service) RunDashboardServer(address string) (err error) {
 	// url router
 	router := mux.NewRouter()
 
@@ -58,14 +57,13 @@ func (svr *Service) RunDashboardServer(addr string, port int) (err error) {
 		http.Redirect(w, r, "/static/", http.StatusMovedPermanently)
 	})
 
-	address := fmt.Sprintf("%s:%d", addr, port)
 	server := &http.Server{
 		Addr:         address,
 		Handler:      router,
 		ReadTimeout:  httpServerReadTimeout,
 		WriteTimeout: httpServerWriteTimeout,
 	}
-	if address == "" {
+	if address == "" || address == ":" {
 		address = ":http"
 	}
 	ln, err := net.Listen("tcp", address)
diff --git a/server/service.go b/server/service.go
index 0bbe9552..fe54cf78 100644
--- a/server/service.go
+++ b/server/service.go
@@ -23,6 +23,7 @@ import (
 	"net"
 	"net/http"
 	"sort"
+	"strconv"
 	"time"
 
 	"github.com/fatedier/frp/assets"
@@ -176,7 +177,8 @@ func NewService(cfg config.ServerCommonConf) (svr *Service, err error) {
 	}
 
 	// Listen for accepting connections from client.
-	ln, err := net.Listen("tcp", fmt.Sprintf("%s:%d", cfg.BindAddr, cfg.BindPort))
+	address := net.JoinHostPort(cfg.BindAddr, strconv.Itoa(cfg.BindPort))
+	ln, err := net.Listen("tcp", address)
 	if err != nil {
 		err = fmt.Errorf("Create server listener error, %v", err)
 		return
@@ -187,13 +189,14 @@ func NewService(cfg config.ServerCommonConf) (svr *Service, err error) {
 	ln = svr.muxer.DefaultListener()
 
 	svr.listener = ln
-	log.Info("frps tcp listen on %s:%d", cfg.BindAddr, cfg.BindPort)
+	log.Info("frps tcp listen on %s", address)
 
 	// Listen for accepting connections from client using kcp protocol.
 	if cfg.KCPBindPort > 0 {
-		svr.kcpListener, err = frpNet.ListenKcp(cfg.BindAddr, cfg.KCPBindPort)
+		address := net.JoinHostPort(cfg.BindAddr, strconv.Itoa(cfg.KCPBindPort))
+		svr.kcpListener, err = frpNet.ListenKcp(address)
 		if err != nil {
-			err = fmt.Errorf("Listen on kcp address udp [%s:%d] error: %v", cfg.BindAddr, cfg.KCPBindPort, err)
+			err = fmt.Errorf("Listen on kcp address udp %s error: %v", address, err)
 			return
 		}
 		log.Info("frps kcp listen on udp %s:%d", cfg.BindAddr, cfg.KCPBindPort)
@@ -213,7 +216,7 @@ func NewService(cfg config.ServerCommonConf) (svr *Service, err error) {
 		}, svr.httpVhostRouter)
 		svr.rc.HTTPReverseProxy = rp
 
-		address := fmt.Sprintf("%s:%d", cfg.ProxyBindAddr, cfg.VhostHTTPPort)
+		address := net.JoinHostPort(cfg.ProxyBindAddr, strconv.Itoa(cfg.VhostHTTPPort))
 		server := &http.Server{
 			Addr:    address,
 			Handler: rp,
@@ -238,11 +241,13 @@ func NewService(cfg config.ServerCommonConf) (svr *Service, err error) {
 		if httpsMuxOn {
 			l = svr.muxer.ListenHttps(1)
 		} else {
-			l, err = net.Listen("tcp", fmt.Sprintf("%s:%d", cfg.ProxyBindAddr, cfg.VhostHTTPSPort))
+			address := net.JoinHostPort(cfg.ProxyBindAddr, strconv.Itoa(cfg.VhostHTTPSPort))
+			l, err = net.Listen("tcp", address)
 			if err != nil {
 				err = fmt.Errorf("Create server listener error, %v", err)
 				return
 			}
+			log.Info("https service listen on %s", address)
 		}
 
 		svr.rc.VhostHTTPSMuxer, err = vhost.NewHTTPSMuxer(l, vhostReadWriteTimeout)
@@ -250,7 +255,6 @@ func NewService(cfg config.ServerCommonConf) (svr *Service, err error) {
 			err = fmt.Errorf("Create vhost httpsMuxer error, %v", err)
 			return
 		}
-		log.Info("https service listen on %s:%d", cfg.ProxyBindAddr, cfg.VhostHTTPSPort)
 	}
 
 	// frp tls listener
@@ -261,14 +265,14 @@ func NewService(cfg config.ServerCommonConf) (svr *Service, err error) {
 	// Create nat hole controller.
 	if cfg.BindUDPPort > 0 {
 		var nc *nathole.Controller
-		addr := fmt.Sprintf("%s:%d", cfg.BindAddr, cfg.BindUDPPort)
-		nc, err = nathole.NewController(addr)
+		address := net.JoinHostPort(cfg.BindAddr, strconv.Itoa(cfg.BindPort))
+		nc, err = nathole.NewController(address)
 		if err != nil {
 			err = fmt.Errorf("Create nat hole controller error, %v", err)
 			return
 		}
 		svr.rc.NatHoleController = nc
-		log.Info("nat hole udp service listen on %s:%d", cfg.BindAddr, cfg.BindUDPPort)
+		log.Info("nat hole udp service listen on %s", address)
 	}
 
 	var statsEnable bool
@@ -281,7 +285,8 @@ func NewService(cfg config.ServerCommonConf) (svr *Service, err error) {
 			return
 		}
 
-		err = svr.RunDashboardServer(cfg.DashboardAddr, cfg.DashboardPort)
+		address := net.JoinHostPort(cfg.DashboardAddr, strconv.Itoa(cfg.DashboardPort))
+		err = svr.RunDashboardServer(address)
 		if err != nil {
 			err = fmt.Errorf("Create dashboard web server error, %v", err)
 			return