All ports open, but still no luck over the internet

I have ARD 3.1, the computer I am trying to connect to has client 3.1. Both computers are on DSL connections behind routers with the software and hardware firewalls turned OFF (temporarily for testing!). Port forwarding is on, and is pointing to the correct local NAT ip.
Yet, whilst ARD is correctly giving me the DNS name when I tap in the IP, it wont recognise any recognisable ARD clients the other end, let alone actually connect to anything.
Any ideas beyond "your firewall isnt off, or port forwarding isnt set up correctly"?
Thanks
Dom

Dom
I always use this handy web page to tell me if ports are open, this must be done on the machine that is running the service, ie the remote machine-
http://canyouseeme.org/
Enter port 5900 and click check, this will tell you if port 5900 (ARD) can be seen by web page
If it comes back with an error then there is a problem with either your config or your ISP has blocked that port.
Have you tried ssh access?
It runs on port 22 and is a good way to tell if you have various settings correct. Open port 22 to remote machine and in terminal type -
ssh -l username xxx.xxx.xxx.xxx
Change username to valid user on remote machine and the xxx should be the IP of the router of the dns name.
Ed

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