按照贴子上说的进行proftp+mysql+quota配置，出现如下出错信息

weizhishu

[root@proxyserver root]# ftp 0
Connected to 0.0.0.0 (0.0.0.0).
220 ProFTPD 1.2.9 Server (Welcome to weizhishu'ftp) [proxyserver]
Name (0:root): dd
421 Service not available, remote server has closed connection
Login failed.
No control connection for command: No such file or directory


但服务是正常启动的没报错，日志里也没报错。不知道从何下手解决。