How to debug SSL handshake errors using java program?

import javax.net.ssl.SSLSocket;

import javax.net.ssl.SSLSocketFactory;

import java.io.InputStream;

import java.io.OutputStream;

public class SSLDebugClient {

public static void main(String[] args) {

if (args.length != 2) {

System.out.println("Input values: "+SSLDebugClient.class.getName()+" <host> <port>");

System.exit(1);

}

try {

SSLSocketFactory sslSocketFactory = (SSLSocketFactory) SSLSocketFactory.getDefault();

//arg0 for host and arg1 for port

SSLSocket sslSocket = (SSLSocket) sslSocketFactory.createSocket(args[0], Integer.parseInt(args[1]));

InputStream inputStream = sslSocket.getInputStream();

OutputStream outputStream = sslSocket.getOutputStream();

// Write test data

outputStream.write(1);

while (inputStream.available() > 0) {

System.out.print(inputStream.read());

}

System.out.println("Connection established successfully");

} catch (Exception exception) {

exception.printStackTrace();

}

Command line:

1. javac SSLDebugClient.java

2. java -Djavax.net.debug=ssl,handshake -Dhttps.protocols=TLSv1.2,TLSv1.1,TLSv1 SSLDebugClient 123.test.net 443

Eclipse Run Configuration settings before running this program:

Another way to check directly from local server:

curl -v -I https://123.test.net

ATG/JAVA