Hello,

Please find a patch attached to add the SIO_UDP_NETRESET flag, which is now 
needed by OpenSSL 3.5.5

Regards,
From d3b5af66b9f0f4e76fd376b7814d46fb52e81af8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20Beauz=C3=A9e-Luyssen?= <[email protected]>
Date: Tue, 27 Jan 2026 15:45:47 +0100
Subject: [PATCH] mswsock: add SIO_UDP_NETRESET

---
 mingw-w64-headers/include/mswsock.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mingw-w64-headers/include/mswsock.h b/mingw-w64-headers/include/mswsock.h
index c9532716d..c1f8582e5 100644
--- a/mingw-w64-headers/include/mswsock.h
+++ b/mingw-w64-headers/include/mswsock.h
@@ -36,6 +36,7 @@ extern "C" {
 #define TCP_BSDURGENT 0x7000
 
 #define SIO_UDP_CONNRESET _WSAIOW(IOC_VENDOR,12)
+#define SIO_UDP_NETRESET _WSAIOW(IOC_VENDOR,15)
 #if (_WIN32_WINNT < 0x0600) && (_WIN32_WINNT >= 0x0501)
 #define SIO_SOCKET_CLOSE_NOTIFY _WSAIOW(IOC_VENDOR,13)
 #endif /* >= XP && < VISTA */
-- 
2.43.0

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