Regarding FTP Client/Server Communication in WIN32

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VisualC++

Hi,

I have developed simple app in win32,which upload the files from the local machine to remote server & also download some file vice versa.

I read somewhere that FTP uses two ports , 20 (ftp-data) & 21(command) for FTP Operation.

Is it possible that, Firewall blocks applications ' Only FTP upload' traffic ? (Application can download file from server in this case)

Or Is it possible that, Firewall blocks applications ' Only FTP download' traffic ?(Application can upload file in this case)
I am thinking both upload & download traffic is managed using single port only 20 (ftp data) in FTP Protocol. So application blocked to put data should be also unable to get data from the server .Kindly correct me out if i am wrong.

Regards,
Sandeep