Getting the application server status on Windows 7 Ultimate does not work

Question

I want to find out if an application server is running or not on a remote computer. I do this with the following code:

Socket localSocket = null;
        try {

            localSocket = new Socket( serverName, serverPort );
            localSocket.close();
            return ServerStatus.UP;

        } catch ( IOException e ) {
            //
        } finally {
            if ( localSocket != null ) {
                try {
                    localSocket.close();
                } catch ( IOException e ) {
                    Log.LOGGER.log( Level.SEVERE, "Socket could not be closed", e );
                }
            }
        }
        return ServerStatus.DOWN;

It works fine on Windows XP (32 bit) and on Windows 7 Professional (64 bit). On Windows 7 Ultimate (64 bit) it does not work at all.

On Windows 7 Ultimate (64 bit) the localSocket can be made in the following cases:

• the remote computer is in the network and connected but the application server on the remote computer is not running.
• the remote computer is in the network and connected but switched off.
• the remote computer is in the network and the network cable on the remote computer is not connected.

On Windows 7 Ultimate (64 bit) the localSocket can not be made in the following cases:

• the remote computer is not in the network.
• the network calbe on my computer is not connected.

Many thanks for any ideas of how to solve this problem.