diff --git a/lib/tun2/server.go b/lib/tun2/server.go
index 58b5601..d3b3dd6 100644
--- a/lib/tun2/server.go
+++ b/lib/tun2/server.go
@@ -213,6 +213,12 @@ func (s *Server) HandleConn(c net.Conn, isKCP bool) {
 		domain:  auth.Domain,
 	}
 
+	ln.Log(ln.F{
+		"action": "backend_connected",
+		"remote": c.RemoteAddr().String(),
+		"kcp":    isKCP,
+	})
+
 	s.connlock.Lock()
 	s.conns[c] = connection
 	s.connlock.Unlock()