Hi there,
I noticed you said you've reset the router so this might not apply to you but i've noticed that happening with mine too. Sometimes the BT Hub adds the device twice and with different IP's so when you look at the 'business network' section you have multiples of the same device. Port forwarding then sends the traffic to the wrong IP. Try deleting them and allowing the router to pick it up again then re-assign the ports.
Deleting just one seems to clear up the whole list too.
What I had to do was narrow my DHCP scope and assign an IP, outwith the scope to avoid duplicates, manually to the devices I wanted to forward to.
When you assign to a device in the port forwarding section, scroll to the bottom of the list and choose 'user defined IP address' and type the address of the device manually.
There's a couple more things to check.
Go to http://www.t1shopper.com/tools/port-scan/ and scan your port.
You can see if this scan got to the router by using the router's log. Click troubleshooting then event log and choose firewall from the drop down. Sometimes good to clear this out and refresh the page after a port scan.
If the port forwarding rule is shown here then you know the router is detecting the traffic and trying to forward it to the device. You will be able to see what device it is forwarding it to as well which might give you a clue.
If not then it could be a faulty router.
If it does show forwarding and the scan page shows no response then it's communication between the router and the device that is failing.
Can you connect to the device internally?
You could use telnet to isolate the device which can help determine if the port on the device is open and listening.
Hope this helps.
Thanks
lol, happy holidays 
