如何在带防火墙的Windows主机中使用InetAddress

Question

I want to get an example or suggestion of how to use InetAddress in windows systems with firewall active. I don't know what is blocked by the firewall that isn't allowing this class in windows to work.

When I try to use this code in windows with firewall disabled I get the host name and isReachable to true:

InetAddress addrs = null;
try {
    addrs = InetAddress.getByName("192.168.1.1");
    System.out.println(addrs.getHostName());
    System.out.println(addrs.isReachable(100));
} catch (UnknownHostException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

But activating firewall I get false , I can use policy for this?

Answer 1

You must configure the firewall to allow for the JVM ( java.exe ) to open connections. The java code does not need to change, it is a configuration issue.