这是什么意思？
状态:> 正在连接到 ftp.cnprint.org (ip = 221.233.195.19)
状态:> Socket 已连接。正在等待欢迎消息...
220 Serv-U FTP Server v6.0 for WinSock ready...
状态:> 已连接，正在验证...
命令:> USER cnprint_mengln
331 User name okay, need password.
命令:> PASS ********
530 Not logged in, home directory does not exist.