Remote Destop Connection trouble

On XP Pro, I could open an RDC from any other computer in the house with
ease. Now, I'm trying to get that to work with Win 7. The "target"
machine is running Win 7 Pro, the client trying to connect is running
Home Premium. I think I have done the steps properly to allow the
connection, yet it is always refused after about 20 seconds. There may be
a Group Policy issue here, but I don't know where to look. Any
suggestions for debugging this?

Thanks,
Jason