请大家指教怎样对登陆ftp server 的软件如cuteftp设置才可以正常传送文件。 有是会遇到问题如： socket error 此外， passive andn port connection 有何不同。什么时候应选择passive mode 什么时候选port type 谢谢

here you are SmellsLikeTeenSpiritCOMMAND:> TYPE A 200 Type set to A. COMMAND:> REST 0 350 Restarting at 0. Send STORE or RETRIEVE. COMMAND:> PORT 172,20,106,20,5,70 530 Only client IP address allowed for PORT command. ERROR:> Not logged in. ERROR:> Failed to establish data socket. using cuteftp, can you tell me is it the problem of my software. or the problem of the server side