Yes u r right my friend, I saw that 8960's gui looks like 8970 so I thought, incorrectly, that the same path should exist. Unfortunately, as I see, there is no such option in 8960, only for blocking...

System Tools > Manage Control > Local Management. You can change default port from there Η πόρτα 80 χρησιμοποιείται για να βλέπεις μέσω browser το interface του router σου. Από την παραπάνω διαδρομή...

You could try updating your hostname through no-ip dashboard > Manage Hostnames > Modify > Update Hostname

In my occasion it took 3 days to Connection Status: registering turn into Connection Status: Success without me doing anything else than wait :cool:

I am resurrecting this topic to ask the same question as OP... I am not so sure that he is still around to answer if he indeed made it work with only router's firewall rules, tho. I have 8970 model...