From 6a2dba9e8c1a896ba5a14b1205a3784c057c86fd Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Tue, 10 Nov 2020 23:08:54 +0300
Subject: [PATCH] Disable IPV6_V6ONLY on IPv6 server sockets on Windows.

---
 tdutils/td/utils/port/ServerSocketFd.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tdutils/td/utils/port/ServerSocketFd.cpp b/tdutils/td/utils/port/ServerSocketFd.cpp
index 9cc685f97ebf..c294a04a4c9b 100644
--- a/tdutils/td/utils/port/ServerSocketFd.cpp
+++ b/tdutils/td/utils/port/ServerSocketFd.cpp
@@ -337,7 +337,11 @@ Result<ServerSocketFd> ServerSocketFd::open(int32 port, CSlice addr) {
   setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, reinterpret_cast<const char *>(&flags), sizeof(flags));
 #endif
 #elif TD_PORT_WINDOWS
-  BOOL flags = TRUE;
+  BOOL flags = FALSE;
+  if (address.is_ipv6()) {
+    setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, reinterpret_cast<const char *>(&flags), sizeof(flags));
+  }
+  flags = TRUE;
 #endif
   setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, reinterpret_cast<const char *>(&flags), sizeof(flags));
   setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, reinterpret_cast<const char *>(&flags), sizeof(flags));