socket通讯在本局域网测试可以，但是部署到客户局域网就报Connection refused: connect

Question

socket通讯在本局域网测试可以，但是部署到客户局域网就报Connection refused: connect，没有网络编程经验，如下是客户端程序，比较简单：

public static String sendOrder(String qyeIp, int qyePort, String msg) throws IOException {
		Socket socket = null;
		String resp = "";
		// System.out.println("请求报文: " + msg);
		socket = new Socket(qyeIp, qyePort);
		ObjectOutputStream os = new ObjectOutputStream(socket.getOutputStream());
		os.writeUTF(msg);
		os.flush();

		ObjectInputStream is = new ObjectInputStream(socket.getInputStream());
		resp = is.readUTF();
		// System.out.println("响应报文: " + resp);

		os.close();
		is.close();
		socket.close(); // 关闭Socket
		return resp;
	}

服务器是客户提供。

Answer 1

关了，telnet能通，服务端是delphi

Answer 2

防火墙！！ 或是其它什么？