SpringBoot 集成 Netty 写的 TCP 服务器遇到的问题

问题是这样子的，我使用 SpringBoot 写了个服务，然后启动了 https，端口监听的是 8080，然后我用 netty 写了个 TCP 服务器，端口监听 9000，然后集成到 SpringBoot 中，所以打包成 jar 包之后启动会启动两个服务，一个 8080 的 http 服务，一个 9000 的 netty tcp 服务。

在本地通过以下代码可以进行客户端连接到服务器

public final class EchoClient {
  static final String HOST = System.getProperty("host", "localhost");
  static final int PORT = Integer.parseInt(System.getProperty("port", "9000"));
  static final int SIZE = Integer.parseInt(System.getProperty("size", "256"));

  public static void main(String[] args) throws Exception {
    EventLoopGroup group = new NioEventLoopGroup();
    try {
      Bootstrap b = new Bootstrap();
      b.group(group)
              .channel(NioSocketChannel.class)
              .remoteAddress(new InetSocketAddress(HOST, PORT))
              .option(ChannelOption.TCP_NODELAY, true)
              .handler(new ChannelInitializer<SocketChannel>() {
                @Override
                public void initChannel(SocketChannel ch) throws Exception {
                  ChannelPipeline p = ch.pipeline();
                  //p.addLast(new LoggingHandler(LogLevel.INFO));
                  p.addLast(new EchoClientHandler());
                }
              });
      ChannelFuture channelFuture = b.connect().sync();
      channelFuture.channel().closeFuture().sync();
    } finally {
      // Shut down the event loop to terminate all threads.
      group.shutdownGracefully();
    }
  }
}

public class EchoClientHandler extends ChannelInboundHandlerAdapter {
  private static final Logger log = Logger.getLogger(EchoClientHandler.class.getName());

  private final ByteBuf firstMessage;

  /**
   * Creates a client-side handler.
   */
  public EchoClientHandler() {
    firstMessage = Unpooled.buffer(EchoClient.SIZE);
    firstMessage.writeBytes("YXV0aEluZm9AYWE6MTIxMTIxMjEy".getBytes(StandardCharsets.UTF_8));
  }

  @Override
  public void channelActive(ChannelHandlerContext ctx) throws Exception {
    log.log(Level.INFO, "正在连接服务端");
    if (ctx.channel().isOpen()) {
      log.info("已开辟连接链路");
      log.info("正在发送消息");
      ChannelFuture channelFuture = ctx.writeAndFlush(firstMessage);
      if (channelFuture.isDone()) {
        log.info("消息发送完毕");
      }
    }
    super.channelActive(ctx);
  }

  @Override
  public void channelReadComplete(ChannelHandlerContext ctx) {
    ctx.flush();
  }

  @Override
  public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
    // Close the connection when an exception is raised.
    cause.printStackTrace();
    ctx.close();
  }
}

但是我把 localhost 修改成阿里云服务器的 ip 地址就不行

Exception in thread "main" io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information: /ip地址:9000
Caused by: java.net.ConnectException: Connection refused: no further information
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:714)
at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:330)
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:702)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)

目前知道的信息是：

1. 使用 Windows Server 2008 RC2
2. 已经关闭了防火墙
3. 已经在阿里云配置了安全组规则，入站出站规则都配置了
4. SpringBoot 服务肯定是已经启动了的，在服务器上使用客户端连接没有问题
5. SpringBoot 启用了 https，tcp 没有
6. 通过 telnet ip 9000 不通

不知道是什么原因，还请各位帮忙。