From 5dda894e29c4bdc4bfdf9ee393bb981bff2b2587 Mon Sep 17 00:00:00 2001
From: Artem Lytkin <146867384+4RH1T3CT0R7@users.noreply.github.com>
Date: Sun, 27 Sep 2026 23:39:17 +0300
Subject: [PATCH] TUN inbound: Reuse existing Wintun adapter by name on Windows
 again (#6811)

Fixes https://github.com/XTLS/Xray-core/issues/6780
---
 proxy/tun/tun_windows.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/proxy/tun/tun_windows.go b/proxy/tun/tun_windows.go
index 2097b6894..aa65694bc 100644
--- a/proxy/tun/tun_windows.go
+++ b/proxy/tun/tun_windows.go
@@ -78,8 +78,13 @@ func open(name, desc string) (*wintun.Adapter, error) {
 	// generate a deterministic GUID from the adapter name
 	id := md5.Sum([]byte(name))
 	guid := (*windows.GUID)(unsafe.Pointer(&id[0]))
+	// try to open existing adapter by name
+	adapter, err := wintun.OpenAdapter(name)
+	if err == nil {
+		return adapter, nil
+	}
 	// try to create adapter anew
-	adapter, err := wintun.CreateAdapter(name, desc, guid)
+	adapter, err = wintun.CreateAdapter(name, desc, guid)
 	if err == nil {
 		return adapter, nil
 	}