UDP Connection through proxy in Delphi

Question

Hello,

I have an application that connects to a udp server, and I can't seem to get it going when I am behind a proxy.

Here is the code I have, which is working fine when Not behind a proxy.

function TfrmMain.SendCommand(ServerName, IP: String; Port: Integer; Command: String): String;
var
  Udp : TIdUDPClient;
  Count : Integer;
  Response: String;
begin
  Result := '';
  Udp := TIdUDPClient.Create(nil);
  try
    try
      Udp.Host := IP;
      Udp.Port := Port;
      if UseProxy then begin
        Udp.TransparentProxy.Enabled := True;
        Udp.TransparentProxy.Host := ProxyServer;
        Udp.TransparentProxy.Port := ProxyPort;
        Udp.OpenProxy;
      end else begin
        Udp.TransparentProxy.Enabled := False;
      end;
      Udp.Connect;
      if Udp.Connected then begin
        //Send Command and receive data...
      end;
      if UseProxy then begin
        Udp.CloseProxy;
      end;
      Udp.Disconnect;
    except
      MessageBox(Handle, PChar('There was an error connecting to server ' + QuotedStr(ServerName) + '.  '), 'Error', MB_ICONERROR);
    end;
  finally
    Udp.Free;
  end;
end;

I don't know what I'm doing wrong, I haven't worked with proxies much, and it is at work that it doesn't work, and it's not a work project, so I can't debug it there.

Thanks in advance.

Answer 1

You are aware that the TransparentProxy must be a SOCKS5 proxy? What kind of proxy have you been testing with?