Cannot connect to remote server in 3.0.3

Hi,

  lftp cannot connect to a remote server, which works well with other
  clients. I believe it is a bug in ftpclass.cc dealing with 221 code.

  lftp [email protected]:~> debug
  lftp [email protected]:~> ls
  ---- Connecting to mail.ustc.edu.cn (202.38.64.10) port 21
  <--- 220-           Welcome to USTC Email Server
  <--- 220-            欢迎来到中国科大邮件服务器
  <--- 220-
  <--- 220- 安全设置: 1. 用户只能在自己的个人目录下操作
  <--- 220-           2. 不可使用chmod命令. 默认上传的文件别人不可读写,
  <--- 220-              上传个人主页文件请先quote site umask 022
  <--- 220-
  <--- 220 mail FTP server ready.
  ---> FEAT
  <--- 221-Extensions supported:
  <---  REST STREAM
  <---  SIZE
  <---  MDTM
  <---  TVFS
  <---  HOST
  <--- 221 End
  **** remote end closed connection
  ---- Closing control socket


  Thanks.

Best regards
Wang