When I try to use URLConnection to check if a url is accessible using the following code:
try {
URL url = new URL("http://169.254.169.254/latest");
URLConnection connection = url.openConnection();
connection.setConnectTimeout(5000);
connection.connect();
System.out.println("Connected successfully using url");
} catch (IOException e) {
e.printStackTrace();
}
I expected the behavior is: connect should be success if the host is reachable, else throw exception. It works fine without the anti-virus application, but always print “connected successfully” even the host is not reachable.
Then I tried to use Socket to connect:
Socket socket = new Socket();
socket.connect(new InetSocketAddress("169.254.169.254", 80));
if (socket.isConnected()) {
System.out.println("Connected successfully using socket");
} else {
System.out.println("Connected failed using socket");
}
But Still got the same problem.
The solution for it:
Disable http check in anti-virus, for example, in ESET NOD32, the settings is Web access protection -> Http, Https -> Http scanner
