Except VPN connection issue, is the router working normally? What's the firmware version? Describe your topology in details. Try to disable hardware NAT on the router.

George, choose allow and create two entries for the server and reset devices seperately. Actually you can refer to the Scenario in Part 2. http://www.tp-link.com/en/article/?faqid=359 Except the...

You are suggested to report such a problem here. http://ticket.tp-link.com/index.php?/Tickets/Submit

Junior, there is a limitation indeed. Before you buy it, you should consult it if it is key feature to you. How many entries are you trying to add?

Frank, their ticket system is not quite stable sometimes and it will close automatically if there is no response from the customer for several days according to my experience. But it is quite easy to...

What's the model number of the ADSL modem? It seems you post the thread in a wrong place. What kinds of Android or iOS devices you tried?