ftp xxx.xxx.xxx.xxx
Connected to xxx.xxx.xxx.xxx.
220 Microsoft FTP Service
Name (xxx.xxx.xxx.xxx:user): username
331 Password required for username.
Password:
230-Welcome
230 User user logged in.
Remote system type is Windows_NT.
ftp> dir
500 Invalid PORT Command.
ftp: bind: Address already in use
ftp>