Windows 7: Remote Desktop Connection Win 7

I have a laptop (A) with Win 7 Pro and another laptop (B) in a different location that also runs Win 7 Pro. I am trying to use remote desktop connect via internet. Pc cannot initiate connection, returning error about is remote pc on, is it able to accept remote control etc.
PC B has remote enabled, port forwarded, and firewall configured.
PC A has an anytime upgrade from win 7 home to win 7 pro.

I can connect via internet to PC A with a computer running win xp. I can ping PC A's ip address. What is the problem that PC B can't connect to PC A? Is it possible that there are services not running or maybe registry key that is incorrect?

Thank you for your time and help.