diff --git a/client/main.go b/client/main.go
index 69d3f9b..6a1d9b5 100644
--- a/client/main.go
+++ b/client/main.go
@@ -2425,21 +2425,29 @@ func pipe(ctx context.Context, c1, c2 net.Conn) {
 		defer wg.Done()
 		defer cancel()
 		if _, err := io.Copy(c1, c2); err != nil {
-			log.Printf("pipe: c1<-c2 copy error: %v", err)
+			if isDebug {
+				log.Printf("pipe: c1<-c2 copy error: %v", err)
+			}
 		}
 	}()
 	go func() {
 		defer wg.Done()
 		defer cancel()
 		if _, err := io.Copy(c2, c1); err != nil {
-			log.Printf("pipe: c2<-c1 copy error: %v", err)
+			if isDebug {
+				log.Printf("pipe: c2<-c1 copy error: %v", err)
+			}
 		}
 	}()
 	wg.Wait()
 	if err := c1.SetDeadline(time.Time{}); err != nil {
-		log.Printf("pipe: failed to reset deadline c1: %v", err)
+		if isDebug {
+			log.Printf("pipe: failed to reset deadline c1: %v", err)
+		}
 	}
 	if err := c2.SetDeadline(time.Time{}); err != nil {
-		log.Printf("pipe: failed to reset deadline c2: %v", err)
+		if isDebug {
+			log.Printf("pipe: failed to reset deadline c2: %v", err)
+		}
 	}
 }