remote assistance only works one way

[Guest]

I am trying to help a friend and want to connect to his comp using remote
desktop. He sends me the request via LiveMessenger but I get the error
"Remote Assistance connection could not be established because the remote
host name could not be resolved. Please try again"

If I send him an invite he connects to me immediately, what setting would
allow him to connect to me but not allow me to connect to him? We tried the
email method but got the same error. I had him turn off his XP firewall. He
is using the router that came with FIOS.

What do you think is only allowing a connection in one direction?

 

[Guest]

sorry for the double post!

 

[Guest]

Do you and your friend have the correct wireless card inserted?

 

[Guest]

We are not trying to connect wirelessly, we are connecting over the internet.
If i send him a request for assistance it gets accepted and he can take over
my comp, if he sends me one I get the error that it cannot resolve hostname