diff --git a/core/lib/transport/encrypt/conn.go b/core/lib/transport/encrypt/conn.go
index db35bd8..9080da2 100644
--- a/core/lib/transport/encrypt/conn.go
+++ b/core/lib/transport/encrypt/conn.go
@@ -38,3 +38,10 @@ func (s *Conn) Read(b []byte) (n int, err error) {
 func (s *Conn) Write(b []byte) (n int, err error) {
 	return s.w.Write(b)
 }
+func (s *Conn) Close() (err error) {
+	err = s.Conn.Close()
+	s.Cipher = nil
+	s.r = nil
+	s.w = nil
+	return err
+}