[Nikky]

Dobro si zaključio, postoje online check - eri (preko browsera, privremeno otvoriš port 80), kao i programčići takve namjene. Evo nekoliko linkova:
http://www.petri.co.il/quickly_find_..._ports_gui.htm
http://www.petri.co.il/quickly_find_..._ports_gui.htm
http://netsecurity.about.com/cs/hack...eeportscan.htm
http://portforward.com/help/portcheck.htm