hey there is many way to unblock your list port!!!
a. you have to disable your firewall.. like your Norton 360 has a firewall.. & if your using a broadband 0r dsl-bayantel internet connection you can use list port like 50000-50019 or 6880-6889
b. speed up your downloading by changing your tcp-ip to 500,.. you see if your using xp sp2 operating system your tcp-ip is only 10,, how ever there is patch to change your tcp-ip
http://www.lvllord.de/