diff --git a/proxy/vless/outbound/outbound.go b/proxy/vless/outbound/outbound.go
index 48164db3..750a3940 100644
--- a/proxy/vless/outbound/outbound.go
+++ b/proxy/vless/outbound/outbound.go
@@ -178,7 +178,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 	clientReader := link.Reader // .(*pipe.Reader)
 	clientWriter := link.Writer // .(*pipe.Writer)
 
-	if request.Command == protocol.RequestCommandUDP && h.cone {
+	if request.Command == protocol.RequestCommandUDP && h.cone && request.Port != 53 && request.Port != 443 {
 		request.Command = protocol.RequestCommandMux
 		request.Address = net.DomainAddress("v1.mux.cool")
 		request.Port = net.Port(666)
diff --git a/proxy/vmess/outbound/outbound.go b/proxy/vmess/outbound/outbound.go
index 0b69dcb1..48462e4a 100644
--- a/proxy/vmess/outbound/outbound.go
+++ b/proxy/vmess/outbound/outbound.go
@@ -131,7 +131,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 	ctx, cancel := context.WithCancel(ctx)
 	timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
 
-	if request.Command == protocol.RequestCommandUDP && h.cone {
+	if request.Command == protocol.RequestCommandUDP && h.cone && request.Port != 53 && request.Port != 443 {
 		request.Command = protocol.RequestCommandMux
 		request.Address = net.DomainAddress("v1.mux.cool")
 		request.Port = net.Port(666)