diff --git a/engine/stun.go b/engine/stun.go
index d6074db..c0b0f31 100644
--- a/engine/stun.go
+++ b/engine/stun.go
@@ -12,11 +12,20 @@ import (
 )
 
 func (s *Engine) stunProxyDownloadClient() error {
+	
+	return s.StartStunProxy("")
+}
+
+
+func (s *Engine) StartStunProxy(name string) error {
 	downloaders := s.db.GetAllDonloadClients()
 	for _, d := range downloaders {
 		if !d.Enable {
 			continue
 		}
+		if name != "" && d.Name != name {
+			continue
+		}
 
 		if d.Implementation != downloadclients.ImplementationQbittorrent { //TODO only support qbittorrent for now
 			continue
@@ -41,4 +50,4 @@ func (s *Engine) stunProxyDownloadClient() error {
 
 	}
 	return nil
-}
+}
\ No newline at end of file
diff --git a/server/setting.go b/server/setting.go
index 5e9fd97..9e9327f 100644
--- a/server/setting.go
+++ b/server/setting.go
@@ -236,6 +236,12 @@ func (s *Server) AddDownloadClient(c *gin.Context) (interface{}, error) {
 	}); err != nil {
 		return nil, errors.Wrap(err, "save downloader")
 	}
+	if in.UseNatTraversal {
+		if err := s.core.StartStunProxy(in.Name); err!= nil {
+			return nil, errors.Wrap(err, "start stun proxy")
+		}
+	}
+	
 	return nil, nil
 }