proftpd无法登陆问题

从www.proftpd.org下载最新的1.3.1rc2版本,在redhat9中安装后,修改proftpd.conf中,将Group nogroup改成Group nobody.启动后,用匿名用户登陆:
331 Anonymous login ok,sent your complete email address as your password
Password:
输入邮箱后显示：
530-Unable to set anonymous privileges.
530 Login incorrect.
Login failed.
Remote system type is UNUIX.
Using binary mode to transfer files.

用建的用户user1登陆
(username)user1
331 Password required for user1
Password输入密码)
530 Login incorretc.
Login failed.
ftp> :D

proftpd无法登陆问题....为什么无法登陆?