NAT traversal problem with Messenger RA.





I'm stumped with a Remote Assistance via Messenger problem. I
have a simple network behind a UPnP enabled Linksys router with two machines
on it. I can do over an RA over the internet to one machine but not the
other. Looking at remote assistance event logs, on one machine, Messenger
gets the public WAN side IP address and sends that, but on the other machine
it fails to get the true public IP and just sends the 192.168.xxx.xxx
private IP.

I got to Googling and discovered that Messenger 4.7 uses
DirectPlay for NAT traversal, and not the SSDP discovery service which the
"Internet Gateway" icon in Network Connections uses for UPnP enabled
routers. The Gateway interface works fine and allows you to manually foward
ports via UPnP and all that. But Direct Play is apparently failing to do the
same thing on one machine.

Any ideas on what could be wrong. I'm at my wit's end here.



-Richard


.



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