Before asking a question here, take a look through the old discussions. There's lots of useful material in there. If you type parallel into the search box at the top of this page you'll find plenty of useful discussion on this topic. If you have any specific queries after you've read through the old posts, just ask.

As for your PPM problem, in what way is it not working? In my experience, most PPM problems are caused by firewalling or proxy misconfiguration.