From 6434c421556c25397d9af7b21365796cd6c7a715 Mon Sep 17 00:00:00 2001
From: tt2468 <tt2468@gmail.com>
Date: Sat, 27 May 2023 22:54:02 -0700
Subject: [PATCH] websocketserver: Retry listen on IPv4 if IPv6 is not
 available

Fixes #1311
---
 src/websocketserver/WebSocketServer.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/websocketserver/WebSocketServer.cpp b/src/websocketserver/WebSocketServer.cpp
index 67d5f68c0..107a124e5 100644
--- a/src/websocketserver/WebSocketServer.cpp
+++ b/src/websocketserver/WebSocketServer.cpp
@@ -113,6 +113,10 @@ void WebSocketServer::Start()
 	} else {
 		blog(LOG_INFO, "[WebSocketServer::Start] Not locked to IPv4 bindings");
 		_server.listen(conf->ServerPort, errorCode);
+		if (errorCode && errorCode == websocketpp::lib::asio::error::address_family_not_supported) {
+			blog(LOG_INFO, "[WebSocketServer::Start] IPv6 address family not supported, binding only to IPv4");
+			_server.listen(websocketpp::lib::asio::ip::tcp::v4(), conf->ServerPort, errorCode);
+		}
 	}
 
 	if (errorCode) {