Kevin,
I just now read your original message in this thread and realized that you are referring to a client pc as being the host you connect to. You must also do the same on their system that you have verified on yours. There must be a difference between the system at work and the one at home if one works and one does not. Is there any firewall at the client that is limiting the ip addresses, pc name, or user that may connect through it? Is the client running Windows 2000, Windows XP Home, or Windows XP Pro? Is the client pc on a network? Do you have a dynamic ip address at home and a static ip address at work? Does your work or your home use NAT? Are all three systems running SP2 (the client, your work, and your pc at home)?

A quick but IMPORTANT check, can you connect to ANY OTHER SYSTEM using remote desktop connection from your home pc?