Remote assistance problems requested through MSN Messenger

I'm having problems with remote assistance requested from my Mums PC through
MSN Messenger to my PC.
She requests assistance, I accept and then nothing happens - I get a message
saying it is connecting to her computer but it doesn't connect or timeout -
just sits there until I cancel it.

Her setup is Windows XP Pro with SP2. Windows Firewall is turned on, which
has the following exceptions ticked (on):

MSN Messenger 7.0
Remote Assistance
Remote Assistance - Windows Messenger and Voice
Remote Desktop
UPnP Framework
Windows Messenger
Windows Netmeeting

Her PC is behind a DLink DSL504 NAT router with UPnP turned on.
Both PC's have Remote Assistance turned on under the Remote options of
System in control panel.

My PC is the same setup except it is behind a Zyxel Prestige 652-R11 NAT
router, also with UPnP turned on, and with the same Windows Firewall
exceptions as hers. One difference between the two PC's is the version of
Windows Messenger. Her's is 4.7.3001 and mine is 5.1.0639. Our MSN Messenger
versions are both at 7.0.0813.

Remote Assistance always used to work until quite recently. The only thing
thats changed (afaik) is MSN Messenger - we both used to use 6.2 (can't
remember the build). I installed Windows Messenger 5.1 some time again, but
remote assistance has worked with it in the past.

One interesting nugget is that it all works if I use my laptop (also behind
the Xyxel router via a Dlink DWL7000AP access point) to take control
remotely instead of my PC. The laptop is a Dell Inspiron 8100 with XP SP2,
MSN Messenger 7.0.0813 and Windows Messenger 4.7.3001.

So are the different versions of Windows Messenger responsible for this
problem? I need V5 of Windows Messenger as I use this to connect to work
using SIP.

Thanks for any advice.
Mike


.

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