From bce7b2cb0ae90cae32a71dcb0d5af64fc87eea32 Mon Sep 17 00:00:00 2001
From: W192547975 <138874985+W192547975@users.noreply.github.com>
Date: Thu, 3 Aug 2023 21:51:38 +0800
Subject: [PATCH] Update nat.go

Fix fixing bug
---
 core/nat.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/core/nat.go b/core/nat.go
index debe3dc..30ff742 100644
--- a/core/nat.go
+++ b/core/nat.go
@@ -121,6 +121,8 @@ func publicIPTest(publicIP string, echoPort int) (hasPublicIP int, hasUPNPorNATP
 		echoConn, err = net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: echoPort})
 		if err != nil {
 			gLog.Println(LvERROR, "echo server listen error:", err)
+			wg.Done()
+			return
 		}
 		wg.Done()
 		// close outside for breaking the ReadFromUDP