I have been trying to connect from my work XPpro PC to my Vista Ult at home. It won't connect. I have tried configuring the router at home. It is a 2Wire router from AT&T. I called them to see if the can help me and they told me it is not possible to do. I can connect from Vista to XP but not XP to Vista. Can anyone help with this issue?

It sounds like an incompatibility between XP and Vista RDP. Just out of curiousity what ver. of IE are you running on your XP machine? If your running IE 6, I've found that if you update to 7 it takes some of the incompatibility issues away.