From 689800c377423cfff3e6aeeac097c41ad28428bc Mon Sep 17 00:00:00 2001
From: Derek S <44935661+Derek-R-S@users.noreply.github.com>
Date: Mon, 5 Apr 2021 23:54:37 -0500
Subject: [PATCH] Made NATPunch socket keep trying if bind failed (Thanks
 FakeByte!)

---
 .../LightReflectiveMirrorTransport.cs         | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/UnityTransport/LightReflectiveMirrorTransport.cs b/UnityTransport/LightReflectiveMirrorTransport.cs
index 1d5331b..a8e93cf 100644
--- a/UnityTransport/LightReflectiveMirrorTransport.cs
+++ b/UnityTransport/LightReflectiveMirrorTransport.cs
@@ -433,10 +433,21 @@ namespace LightReflectiveMirror
                             initalData.WriteString(ref sendPos, data.ReadString(ref pos));
                             NATPunchtroughPort = data.ReadInt(ref pos);
 
-                            _NATPuncher = new UdpClient { ExclusiveAddressUse = false };
-                            _NATIP = new IPEndPoint(IPAddress.Parse(GetLocalIp()), UnityEngine.Random.Range(16000, 17000));
-                            _NATPuncher.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
-                            _NATPuncher.Client.Bind(_NATIP);
+                            if (_NATPuncher == null)
+                            {
+                                _NATPuncher = new UdpClient { ExclusiveAddressUse = false };
+                                while (true)
+                                {
+                                    try
+                                    {
+                                        _NATIP = new IPEndPoint(IPAddress.Parse(GetLocalIp()), UnityEngine.Random.Range(16000, 17000));
+                                        _NATPuncher.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
+                                        _NATPuncher.Client.Bind(_NATIP);
+                                        break;
+                                    }
+                                    catch {} // Binding port is in use, keep trying :P
+                                }
+                            }
 
                             IPAddress serverAddr;