Updated to use hostname as when testing the IP was not matching again…

…st the whitelist. We don't really need to get the IP until we fail to get a proxy connection also the IP of the returned connection could be different from the IPEndPoint we resolved.

QuickFIXn/Transport/StreamFactory.cs

@@ -48,7 +48,7 @@ private static Socket CreateTunnelThruProxy(string destIP, int destPort, string
             socketThruProxy.Connect(proxyEndPoint);
 
             string proxyMsg = !string.IsNullOrWhiteSpace(destHostName)
-                ? $"CONNECT {destIP}:{destPort} HTTP/1.1\nHost: {destHostName}:{destPort}\n\n"
+                ? $"CONNECT {destHostName}:{destPort} HTTP/1.1\nHost: {destHostName}:{destPort}\n\n"
                 : $"CONNECT {destIP}:{destPort} HTTP/1.1\n\n";
             byte[] buffer = Encoding.ASCII.GetBytes(proxyMsg);
             byte[] buffer12 = new byte[500];