After you accepted Remote Assistance request through MSN/Live Messenger, there is nothing happen. You read a number of pages on Microsoft support site or may have searched a number of different web pages already on why Windows Remote Assistance does not respond. Even though you had validated your network access and firewall setting, there is nothing that helps. Why?
One detail that been overlooked: does your router support uPnP (universal Plug and Play)? Older routers generally do not support uPnP and Remote Assistance requires this feature to work properly.
Getting a new router or try other method to start Remote Assistance?
If you want to send the invitation through email and want to avoid the complex steps of navigating through the menu, click Windows-R, type "msra" to run. Follow the on screen instructions to generate the invitation file.