diff --git a/go.mod b/go.mod
index ba4f623..07ed9fa 100644
--- a/go.mod
+++ b/go.mod
@@ -21,7 +21,7 @@ require (
 	github.com/xtaci/kcp-go v5.0.7+incompatible
 	golang.org/x/crypto v0.0.0-20190228161510-8dd112bcdc25
 	golang.org/x/net v0.0.0-20190301231341-16b79f2e4e95 // indirect
-	golang.org/x/sys v0.0.0-20190303192550-c2f5717e611c // indirect
+	golang.org/x/sys v0.0.0-20190305064518-30e92a19ae4a // indirect
 )
 
 // Replace dependency modules with local developing copy
diff --git a/go.sum b/go.sum
index a90945e..2205cf7 100644
--- a/go.sum
+++ b/go.sum
@@ -41,3 +41,5 @@ golang.org/x/sys v0.0.0-20190303122642-d455e41777fc h1:8EoQ+alqRKjWXD8k4lJE91+f2
 golang.org/x/sys v0.0.0-20190303122642-d455e41777fc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190303192550-c2f5717e611c h1:AXm9RSDBofvoECjrx/I1fceu1mdoJP5zCjxjsOmyGgI=
 golang.org/x/sys v0.0.0-20190303192550-c2f5717e611c/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190305064518-30e92a19ae4a h1:wsSB0WNK6x5F2PxWYOQpGTzp/IH7X8V603VJwSXZUWc=
+golang.org/x/sys v0.0.0-20190305064518-30e92a19ae4a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
diff --git a/main.go b/main.go
index cfee7c9..9dccf2f 100644
--- a/main.go
+++ b/main.go
@@ -32,6 +32,9 @@ import (
 const VERSION = "0.7.0"
 
 func main() {
+	// TODO: remove this line when Go1.13 is released.
+	os.Setenv("GODEBUG", os.Getenv("GODEBUG")+",tls13=1")
+
 	// read configs
 	confInit()
 
diff --git a/proxy/redir/redir_linux.go b/proxy/redir/redir_linux.go
index 0f966d4..06f2fc9 100644
--- a/proxy/redir/redir_linux.go
+++ b/proxy/redir/redir_linux.go
@@ -100,7 +100,7 @@ func (s *RedirProxy) Serve(c net.Conn) {
 
 	// loop request
 	if c.LocalAddr().String() == tgt.String() {
-		log.F("[redir] loop request detected")
+		log.F("[redir] %s <-> %s, unallowed request to redir port", c.RemoteAddr(), tgt)
 		return
 	}