Freebsd use proftpd ,password is NULL.

[xxgchappy]

I　do not know why ,any one can log in my server without password

I have seen the topic,but it seems useless

http://forums.cpanel.net/showthread....oftpd+password

admin::1002:0:admin:/home/admin:/bin/sh
this is first line on my passwd.hosts file,please tell me how to solve it.

[xxgchappy]

please help me