Yes, in the router I have given every connected device a name that reflects its operation, my smartphone, samknows router, downstairs_PC, Upstairs_PC etc, saves memorising IP addresses. That way I can simply select the right device from a drop down menu. I setup portforwarding using this method.
I have also setup a static IP for the device thats acts as a static webserver.
The only thing I can think of, is the router is somehow hardwired to prevent incoming port requests. I have read this is very common with 'domestic' plans. Quite what they gain from it, defies my logic.