Windows remote assistance

I am using Win XP. PC I am trying to connect to is Win 7 and has norton 360 v 4.3.0.5.

I can connect using remote desktop but not using remote assistance. when I click on invite, and enter password supplied by that 2nd PC, I get an error message about checking network connections.

What do I need to do? Can I add Remote Assistance as a program rule?

 

Thanks for the help.

 

Patti