[右] 正在连接到 www.51testing.com -> DNS=www.51testing.com IP=61.152.133.107 PORT=21
[右] 正在连接到 www.51testing.com
[右] 220 Serv-U FTP Server v5.0 for WinSock ready...
[右] USER www.51testing.com
[右] 331 User name okay, need password.
[右] PASS (隐藏)
[右] 530 Not logged in.
[右] 连接失败