diff --git a/Controls/SerialOutputCoT.cs b/Controls/SerialOutputCoT.cs
index 9fca6428bb..a067bd1eb4 100644
--- a/Controls/SerialOutputCoT.cs
+++ b/Controls/SerialOutputCoT.cs
@@ -171,7 +171,7 @@ void mainloop()
 
                             if (CoTStream != null && CoTStream.IsOpen)
                             {
-                                CoTStream.WriteLine(xmlStr.Replace("\r", ""));
+                                CoTStream.Write(xmlStr.Replace("\r", ""));
                             }
                         });
                     });
diff --git a/ExtLibs/Comms/CommsUDPSerialConnect.cs b/ExtLibs/Comms/CommsUDPSerialConnect.cs
index d412640c56..0173fd7bf1 100644
--- a/ExtLibs/Comms/CommsUDPSerialConnect.cs
+++ b/ExtLibs/Comms/CommsUDPSerialConnect.cs
@@ -92,7 +92,11 @@ public void Open(string host, string port)
             if (IsInRange("224.0.0.0", "239.255.255.255", hostEndPoint.Address.ToString()))
             {
                 log.Info($"UdpSerialConnect bind to port {Port}");
-                client = new UdpClient(int.Parse(Port), hostEndPoint.AddressFamily);
+
+                client = new UdpClient();
+                client.ExclusiveAddressUse = false;
+                client.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
+                client.Connect(hostEndPoint.Address, hostEndPoint.Port);
 
                 IsOpen = true;