diff --git a/src/cmd/frpc/control.go b/src/cmd/frpc/control.go
index 55d8798..01eb8a0 100644
--- a/src/cmd/frpc/control.go
+++ b/src/cmd/frpc/control.go
@@ -55,15 +55,24 @@ func msgReader(cli *client.ProxyClient, c *conn.Conn, msgSendChan chan interface
 	var heartbeatTimeout bool = false
 	timer := time.AfterFunc(time.Duration(client.HeartBeatTimeout)*time.Second, func() {
 		heartbeatTimeout = true
-		c.Close()
+		if c != nil {
+			c.Close()
+		}
+		if cli != nil {
+			// if it's not udp type, nothing will happen
+			cli.CloseUdpTunnel()
+			cli.SetCloseFlag(true)
+		}
 		log.Error("ProxyName [%s], heartbeatRes from frps timeout", cli.Name)
 	})
 	defer timer.Stop()
 
 	for {
 		buf, err := c.ReadLine()
-		if err == io.EOF || c == nil || c.IsClosed() {
+		if err == io.EOF || c.IsClosed() {
+			timer.Stop()
 			c.Close()
+			cli.SetCloseFlag(true)
 			log.Warn("ProxyName [%s], frps close this control conn!", cli.Name)
 			var delayTime time.Duration = 1
 
@@ -76,11 +85,14 @@ func msgReader(cli *client.ProxyClient, c *conn.Conn, msgSendChan chan interface
 					msgSendChan = make(chan interface{}, 1024)
 					go heartbeatSender(c, msgSendChan)
 					go msgSender(cli, c, msgSendChan)
+					cli.SetCloseFlag(false)
 					break
 				}
 
-				if delayTime < 60 {
+				if delayTime < 30 {
 					delayTime = delayTime * 2
+				} else {
+					delayTime = 30
 				}
 				time.Sleep(delayTime * time.Second)
 			}
diff --git a/src/cmd/frps/control.go b/src/cmd/frps/control.go
index f6de7aa..a6cd6a3 100644
--- a/src/cmd/frps/control.go
+++ b/src/cmd/frps/control.go
@@ -85,7 +85,9 @@ func controlWorker(c *conn.Conn) {
 			return
 		}
 	} else {
-		closeFlag = false
+		if ret == 0 {
+			closeFlag = false
+		}
 		return
 	}
 
diff --git a/src/models/client/client.go b/src/models/client/client.go
index 2e9dbf9..5c5b2b2 100644
--- a/src/models/client/client.go
+++ b/src/models/client/client.go
@@ -39,6 +39,9 @@ type ProxyClient struct {
 
 	udpTunnel *conn.Conn
 	once      sync.Once
+	closeFlag bool
+
+	mutex sync.RWMutex
 }
 
 // if proxy type is udp, keep a tcp connection for transferring udp packages
@@ -48,7 +51,7 @@ func (pc *ProxyClient) StartUdpTunnelOnce(addr string, port int64) {
 		var c *conn.Conn
 		udpProcessor := NewUdpProcesser(nil, pc.LocalIp, pc.LocalPort)
 		for {
-			if pc.udpTunnel == nil || pc.udpTunnel.IsClosed() {
+			if !pc.IsClosed() && (pc.udpTunnel == nil || pc.udpTunnel.IsClosed()) {
 				if HttpProxy == "" {
 					c, err = conn.ConnectServer(fmt.Sprintf("%s:%d", addr, port))
 				} else {
@@ -82,8 +85,11 @@ func (pc *ProxyClient) StartUdpTunnelOnce(addr string, port int64) {
 					time.Sleep(1 * time.Second)
 					continue
 				}
+				pc.mutex.Lock()
 				pc.udpTunnel = c
 				udpProcessor.UpdateTcpConn(pc.udpTunnel)
+				pc.mutex.Unlock()
+
 				udpProcessor.Run()
 			}
 			time.Sleep(1 * time.Second)
@@ -91,6 +97,14 @@ func (pc *ProxyClient) StartUdpTunnelOnce(addr string, port int64) {
 	})
 }
 
+func (pc *ProxyClient) CloseUdpTunnel() {
+	pc.mutex.RLock()
+	defer pc.mutex.RUnlock()
+	if pc.udpTunnel != nil {
+		pc.udpTunnel.Close()
+	}
+}
+
 func (pc *ProxyClient) GetLocalConn() (c *conn.Conn, err error) {
 	c, err = conn.ConnectServer(fmt.Sprintf("%s:%d", pc.LocalIp, pc.LocalPort))
 	if err != nil {
@@ -158,3 +172,15 @@ func (pc *ProxyClient) StartTunnel(serverAddr string, serverPort int64) (err err
 
 	return nil
 }
+
+func (pc *ProxyClient) SetCloseFlag(closeFlag bool) {
+	pc.mutex.Lock()
+	defer pc.mutex.Unlock()
+	pc.closeFlag = closeFlag
+}
+
+func (pc *ProxyClient) IsClosed() bool {
+	pc.mutex.RLock()
+	defer pc.mutex.RUnlock()
+	return pc.closeFlag
+}