vsftpd: pam_unix(vsftpd:auth): check pass; user unknown

[showsscel]

vsftpd虚拟用户，为什么老是登录验证通不过呢，那位大侠帮忙一下。。。。

Aug 27 15:24:14 localhost vsftpd: pam_unix(vsftpd:auth): check pass; user unknown
Aug 27 15:24:14 localhost vsftpd: pam_unix(vsftpd:auth): authentication failure; logname= uid=0 euid=0 tty=ftp ruser=webadmin rhost=127.0.0.1