java - 无法与远程服务器上的 RMI 注册表建立连接

Question

目前我正在尝试在远程计算机上使用 RMI 启动 java 服务器。服务器似乎已启动，但我无法在客户端上调用其方法。在客户端上，我收到一个异常，如下所示:

Exception in thread "main" java.rmi.ConnectException: Connection refused to host: 10.0.0.6; nested exception is: 
    java.net.ConnectException: Operation timed out (Connection timed out)

这是我的 RMI 服务器构造函数:

    private RmiServer(String address, int port) throws RemoteException, SQLException, MalformedURLException {
        System.out.println("This address = " + address + ", Port = " + port);
        Registry registry;
        try {
            registry = LocateRegistry.createRegistry(PORT);
        } catch (RemoteException e)
        {
            registry = LocateRegistry.getRegistry(PORT);
        }
        System.setProperty("java.rmi.server.hostname", address);
        try {
            registry.bind(REGISTRY_NAME, this);
            Naming.bind(address, this);
        }
        catch (AlreadyBoundException e)
        {
            registry.rebind(REGISTRY_NAME, this);
            Naming.rebind(address, this);
        }
        ...
    }

这是我的客户端代码:

    static public void main(String[] args) throws IOException {
        try {
            Registry registry = LocateRegistry.getRegistry(SERVER_ADDRESS, SERVER_PORT);
            rmiServer = (ReceiveMessageInterface) registry.lookup(REGISTRY_NAME);
        } catch (RemoteException | NotBoundException e) {
            System.err.println(e.getMessage());
            isServerOK = false;
        }
        Scanner reader = new Scanner(new InputStreamReader(System.in));
        boolean isAuthenticated = false;
        int pin;
        String cardNumber;
        SessionInfo session = null;
        if (isServerOK) {
            while (true) {
                if (!isAuthenticated) {
                    System.out.println("Welcome Customer to HDFC Bank ATM : \nPlease enter your card number: ");
                    cardNumber = reader.next();
                    System.out.println("Please enter your PIN: ");
                    pin = reader.nextInt();
                    String cardHolderName = rmiServer.verifyPIN(cardNumber, pin);
                    ...
                }
                ...
            }
            ...
        }
        ...
    }

我用这个字符串启动服务器:

java -cp flyway-core-6.0.8.jar:mssql-jdbc-7.4.1.jre8.jar:mysql-connector-java-8.0.18.jar:. -Djava.security.policy=java.security.AllPermission kmalfa.RmiServer

我的服务器在Linux虚拟机上运行。我使用微软Azure服务。我关闭了客户端和虚拟机上的防火墙。我出于测试目的允许了 Azure 设置中的所有传入连接，但这没有帮助。可能是什么问题？

Answer 1

已解决。

刚刚打电话

System.setProperty("java.rmi.server.hostname", address);

不在RmiServer构造函数中，但在调用它之前，在main的开头