MSNMessenger6.0 not works for file xfer & webcam xfer

Hi,
I am using MSN messenger6.0 and two WinXP Pro PCs to transfer files. My
configuration is like this:

MSN6.0/XP PC1 -- UPnP/Router1 ------ Internet

MSN6.0/XP PC2 -- UPnP/Router 2 ------ Internet.

After signing in on both sides, I could do chatting,whiteboard, application
sharing and remote assistance sessions successfully.I have observed that
MSNmsgr6.0 adds different port maps for different applications using UPnP.

But when I try file transfer, it just does not work.
Also when I try to send the webcam video, messenger simply ignores it. I see
only a single port map getting added.I have removed the existing portmaps
before starting the MSN as told by Jonathan in NG.

I appreciate your help.
Thanks.

venu maya.