From 50db246003965350423197b52eacbde9c87c8add Mon Sep 17 00:00:00 2001
From: dyhkwong <50692134+dyhkwong@users.noreply.github.com>
Date: Thu, 6 Nov 2025 19:45:51 +0800
Subject: [PATCH] Revert "Disable TCP slow open for anytls"

---
 protocol/anytls/outbound.go | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/protocol/anytls/outbound.go b/protocol/anytls/outbound.go
index c8d8bf438b..b026ed1803 100644
--- a/protocol/anytls/outbound.go
+++ b/protocol/anytls/outbound.go
@@ -13,7 +13,6 @@ import (
 	"github.com/sagernet/sing-box/log"
 	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing/common"
-	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
 	"github.com/sagernet/sing/common/uot"
@@ -44,13 +43,6 @@ func NewOutbound(ctx context.Context, router adapter.Router, logger log.ContextL
 	if options.TLS == nil || !options.TLS.Enabled {
 		return nil, C.ErrTLSRequired
 	}
-	// TCP Fast Open is incompatible with anytls because TFO creates a lazy connection
-	// that only establishes on first write. The lazy connection returns an empty address
-	// before establishment, but anytls SOCKS wrapper tries to access the remote address
-	// during handshake, causing a null pointer dereference crash.
-	if options.DialerOptions.TCPFastOpen {
-		return nil, E.New("tcp_fast_open is not supported with anytls outbound")
-	}
 
 	tlsConfig, err := tls.NewClient(ctx, options.Server, common.PtrValueOrDefault(options.TLS))
 	if err != nil {