From 9bf55a343314917ba9de5be192f2aad77697193c Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Fri, 12 Jun 2020 21:16:46 -0700
Subject: [PATCH] Disable QoS tagging if 2 connect packets in a row are dropped

---
 protocol.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/protocol.c b/protocol.c
index d268214..4d95519 100644
--- a/protocol.c
+++ b/protocol.c
@@ -1718,6 +1718,12 @@ enet_protocol_send_outgoing_commands (ENetHost * host, ENetEvent * event, int ch
 
         currentPeer -> lastSendTime = host -> serviceTime;
 
+        if (currentPeer -> state == ENET_PEER_STATE_CONNECTING && currentPeer -> packetsLost == 2) {
+            // Disable QoS tagging if we don't get a response to 2 connection requests in a row.
+            // Some networks drop QoS tagged packets, so let's try without it.
+            enet_socket_set_option (host -> socket, ENET_SOCKOPT_QOS, 0);
+        }
+
         sentLength = enet_socket_send (host -> socket, & currentPeer -> address, host -> buffers, host -> bufferCount);
 
         enet_protocol_remove_sent_unreliable_commands (currentPeer);