Does the host (the person you are trying to help) have a public IP? I
suspect that it is on a private subnet i.e. 192.168... or something like
that. You will not be able to connect to a pc on a private network without a
NAT router that can pass RDP from the routers public IP to the internal
private IP.

HTH,
Chad Smith

"Alfredo Crisostomo" <alf_riro@yahoo.com.ar> wrote in message
news:uaXAvoT6FHA.2560@TK2MSFTNGP12.phx.gbl...
> In a LAN using internet through a router, I connect to a friend over the
> same lan, to give him support, via Messenger remote assistance service and
> works great!!!, both connected to the internet., but when i'm trying to
> connect from another pc outside the lan, i.e., my laptop pc from my home
> and I try to give him assistance via messenger, the connection fails. It
> says:
> "Remote Assistance connection could not be established because the remote
> host name could not be resolved. Please try again."
>
> Please anybody help me.
>
> Thanks a lot
>