AWS部署客户端服务器应用程序

Question

我对此AWS虚拟机有疑问。我已经从安全组的任何位置设置了所有TCP，UDP，流量和ICMP，我的本地计算机可以将虚拟机ping到公共IP地址。但不知何故，如果我尝试使用本地计算机上的客户端服务器连接，套接字类无法连接到虚拟机上的其他类？ 这是本地计算机上的客户端代码：

Socket clientSocket = new Socket(VMAdress, 6789); DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream()); BufferedReader inFromServer = new BufferedReader(new  InputStreamReader(clientSocket.getInputStream())); sentence = inFromUser.readLine(); outToServer.writeBytes(sentence + '\n'); modifiedSentence = inFromServer.readLine();

这是虚拟机上的服务器代码：

ServerSocket welcomeSocket = new ServerSocket(6789);

     while(true)
     {
        Socket connectionSocket = welcomeSocket.accept();
        BufferedReader inFromClient =
           new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
        DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
        clientSentence = inFromClient.readLine();
        System.out.println("Received: " + clientSentence);
        capitalizedSentence = clientSentence.toUpperCase() + '\n';
        outToClient.writeBytes(capitalizedSentence);
     }

提前感谢您的帮助。