Remote Desktop fails with Router

MacPeople

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Using Apple Remote Desktop 3.2 and a Speedtouch 330 USB broadband modem I used to be able to connect to my parents' machine and fix problems via the Internet. Since upgrading to a Speedtouch ST585 ROUTER, I can only share the other machines desktop; I can no longer perform reports, transfer files, etc. I also can't upgrade client software - it says "This task will fail: The Remote Desktop Client software is not active on <client machine>" - when it IS! It all works fine if I just plug the old modem back. I suspect it's an issue to do with a router's firewall or port forwarding but have no idea what I need to change on MY machine to make it work. (I managed to switch OFF the firewall but it make no difference.) Can anyone advise what setting I need to change (and how?). Thank you. (http://speedtouch.lan/ gets me to the router's menus but I don't know where to go from there.)
 
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