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At the Novice end (the person who requests the assistance), any NAT router in use must support UPnP, and UPnP must be specifically enabled in the router configuration.
also, XP must have the SSDP Discovery Service running (this is the default, but sometimes this service is mistakenly disabled by users), and must have Windows Firewall configured to make Exceptions for "UPnP Framework", for "Remote Assistance", (and possibly also for "Remote Desktop").
If the Novice's NAT router does not support UPnP, then you will never get Remote Assistance to work automatically. UPnP is required in the NAT router so that Remote Assistance can discover the WAN IP address of the Novice's internet connection, to be written into the help request ticket.
If you wish to make Remote Assistance work through a NAT router at the Novice end which does not support UPnP, then you must be prepared to take special manual steps:
1. The Novice's NAT router must be configured to forward TCP port 3389 to the LAN IP address of the PC requesting assistance;
2. The Novice's Remote Assistance requests must be sent via e-mail or file transfer, not by Messenger;
3. The Expert must have a means of knowing the WAN IP address of the Novice's internet connection (i.e. the WAN IP address of the Novice's NAT router);
4. Every time the Expert receives an Remote Assistance request ticket from this Novice by e-mail or file transfer, the Expert must not open it immediately. Instead, the Expert should open the ticket in Notepad, and edit the obvious incorrect IP addresses in the ticket (which will have a ":3389" port designator suffix) to change the IP address to the known WAN IP address of the Novice's internet connection, still with the ":3389" suffix. Then the Expert should save the changes, and then double-click on the ticket icon so as to open the Remote Assistance session.
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cut/paste from somewhere i can't remember where it was...
Last edited by Ctrl-Alt-Del; Dec 26, 2004 at 03:07 AM.
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