windows - How to access my local server on my VirtualBox virtual machine?

Here's my setup:

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  I have a local server running on my machine (Mac OS, Snow Leopard). I can access it via my browser by doing

  
  

  localhost:3000

  
  


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  I have a virtual machine using Virtual Box running a windows XP. If I try to access using localhost:3000, it fails. Same thing if I use the ip of the Mac machine.

  
  


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  The virtual machine has access to the internet.

  
  

How can I access my local server in my virtual machine?