The recommended way to test your applications with the connected workgroups feature is to use 2 computers for testing. If you only have 1 computer you can easily fix the problem by conjuring another one with your magic wand.
What's that you say? You don't have a magic wand? No problem. Just go to your boss and ask for a new computer to be purchased from your unlimited budget.
Oh, I see. You have a fixed budget and would rather spend money on other things. Fine. I figured out how to get 2 replicated Vaults running on the same server, and I wrote how to do it in a document.
Keep in mind, this technique is just for development and testing purposes. Don't use it for production Vaults. Although I can't think of why you would ever want to.