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https://askubuntu.com/questions/413677/vsftpd-530-login-incorrect
http://blog.51yip.com/linux/1672.html
https://blog.csdn.net/chendian_yue/article/details/80361380
http://blog.51cto.com/ludihua/1721060
http://www.111cn.net/sys/linux/72702.htm
https://zhuanlan.zhihu.com/p/26323207
https://www.jb51.net/os/Ubuntu/470489.html
https://www.xnadevelop.com/uncategorized/amazon-ec2-ubuntu-vsftpd-530/
http://linux.vbird.org/linux_server/0410vsftpd/0410vsftpd.php
http://linux.vbird.org/linux_server/0410vsftpd.php
https://ithelp.ithome.com.tw/questions/10124428
http://www.cnblogs.com/loanhicks/archive/2017/05.html
http://ubottu.com/meetingology/logs/logs.ubuntu-eu.org/freenode/2009/12/30/%23ubuntu-cn.html