Resolution:
The following Java code can be used to ping a Manager from an Engine.
import java.net.*;
import java.util.*;
import java.io.*;/*
* ManagerHttpPing.java
*
* Utility class to get the 'ping' HTML page from a given manager. Useful for checking network connectivity and
* basic manager health.
*
* javac ManagerHttpPing.java
* java ManagerHttpPing manager.my.domain.com:port
*/ public class ManagerHttpPing {
     public static void main(String [] args) throws Exception {
         if (args.length != 1) {
             throw new Exception("Incorrect args count");
         }
         if (args[0].indexOf(':') == -1) {
             throw new Exception("You must specify host:port");
         }
         long startmillis = System.currentTimeMillis();
         StringTokenizer tok = new StringTokenizer(args[0], ":");
         String host = tok.nextToken();
         String port = tok.nextToken();
         URL url = new URL("http", host, Integer.parseInt(port), "/livecluster/public_html/ping/ping.jsp");
         URLConnection conn = url.openConnection();
         ByteArrayOutputStream baos = new ByteArrayOutputStream();
         InputStream is = conn.getInputStream();
         byte [] buf = new byte[4096];
         int n;
         int bytes = 0;
         while ((n = is.read(buf)) != -1) {
             baos.write(buf, 0, n);
             bytes += n;
         }
         System.out.println("ManagerHttpPing retrieved " + bytes + " bytes from " + url.toString() + " in " +
                 (System.currentTimeMillis() - startmillis) + " milliseconds.");
    }
}