diff --git a/proxy/socks/tcp.go b/proxy/socks/tcp.go
index 577e59b..c73f48f 100644
--- a/proxy/socks/tcp.go
+++ b/proxy/socks/tcp.go
@@ -51,16 +51,22 @@ func (h *tcpHandler) relay(localConn, remoteConn net.Conn) {
 
 	// Up Link
 	go func() {
-		io.Copy(remoteConn, localConn)
-		tcpCloseRead(localConn)
-		tcpCloseWrite(remoteConn)
+		if _, err := io.Copy(remoteConn, localConn); err != nil {
+			closeOnce()
+		} else {
+			tcpCloseRead(localConn)
+			tcpCloseWrite(remoteConn)
+		}
 		wg.Done()
 	}()
 
 	// Down Link
-	io.Copy(localConn, remoteConn)
-	tcpCloseRead(remoteConn)
-	tcpCloseWrite(localConn)
+	if _, err := io.Copy(localConn, remoteConn); err != nil {
+		closeOnce()
+	} else {
+		tcpCloseRead(remoteConn)
+		tcpCloseWrite(localConn)
+	}
 
 	wg.Wait() // Wait for Up Link done
 
diff --git a/proxy/socks/utils.go b/proxy/socks/utils.go
index 21b7386..316c3d7 100644
--- a/proxy/socks/utils.go
+++ b/proxy/socks/utils.go
@@ -3,8 +3,6 @@ package socks
 import (
 	"net"
 	"time"
-
-	"github.com/xjasonlyu/tun2socks/common/log"
 )
 
 type duplexConn interface {
@@ -15,14 +13,12 @@ type duplexConn interface {
 
 func tcpCloseRead(conn net.Conn) {
 	if c, ok := conn.(duplexConn); ok {
-		log.Warnf("ok!----")
 		c.CloseRead()
 	}
 }
 
 func tcpCloseWrite(conn net.Conn) {
 	if c, ok := conn.(duplexConn); ok {
-		log.Warnf("ok!++++")
 		c.CloseWrite()
 	}
 }