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http://www.111cn.net/sys/linux/80016.htm
http://www.vuln.cn/2766
https://forum.filezilla-project.org/viewtopic.php?t=4864
https://bobcares.com/blog/why-you-get-530-login-authentication-failed-in-your-cpanel-pure-ftpd-ftp-server/
http://www.urbansh.com/cpanel-ftp-530-login-authentication-failed.html
http://www.lowest-price-web-hosting.com/big5/bbs/viewthread.php?tid=1288
https://itsyndicate.org/blog/how-to-fix-530-login-authentication-failed/
http://blog.sina.com.cn/s/blog_4cbf97060100v29h.html
http://ask.apelearn.com/question/13456
http://help.hupohost.com/ftp-530-login-authentication-failed/
https://stackoverflow.com/questions/10695290/ftp-error-530-login-authentication-failed
https://hoststud.com/resources/resolved-error-530-login-authentication-failed.282/
https://serversitters.com/how-to-fix-530-login-authentication-failed-in-pure-ftp-on-cpanel.html