diff --git a/adapters/outbound/trojan.go b/adapters/outbound/trojan.go
index 99f67c306..a87bac7fa 100644
--- a/adapters/outbound/trojan.go
+++ b/adapters/outbound/trojan.go
@@ -104,15 +104,15 @@ func (t *Trojan) DialUDP(metadata *C.Metadata) (_ C.PacketConn, err error) {
 			return nil, fmt.Errorf("%s connect error: %w", t.addr, err)
 		}
 		tcpKeepAlive(c)
+		c, err = t.instance.StreamConn(c)
+		if err != nil {
+			c.Close()
+			return nil, fmt.Errorf("%s connect error: %w", t.addr, err)
+		}
 	}
 
 	defer safeConnClose(c, err)
 
-	c, err = t.instance.StreamConn(c)
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error: %w", t.addr, err)
-	}
-
 	err = t.instance.WriteHeader(c, trojan.CommandUDP, serializesSocksAddr(metadata))
 	if err != nil {
 		return nil, err