Proxy to File Scenario

Hi Experts,

i am doing proxy to file scenario. i have done with configurations and proxy generation. i got struck up with one doubt.In receiver side we are using FTP file will be place out side of the network.i have give the configurations details like target director and file name and anonymous Uname and Password which was third party people give.port also i have specified default 21 only. is it required to enable to port in our side to file will be placed to out side of the network. please give your valuable suggestions. highly appreciated your help.

Thanks & Best Regards,

Sanjay.