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https://community.hpe.com/t5/System-Administration/ftp-is-not-working/td-p/5346251
https://community.hpe.com/t5/System-Administration/ftp-login-refused-bad-shell/td-p/3409316
https://community.hpe.com/t5/System-Administration/FTP-login-Refused/td-p/2465306
ftp://ftp5.gwdg.de/pub/misc/wu-ftpd/ftp.landfield.com/mail-archive/wuftpd-questions/2003/Jun/0027.html
https://www.redhat.com/archives/redhat-list/2000-September/msg01695.html
https://www.unix.com/solaris/200543-ftp-user-issue-etc-shells.html
https://www.unix.com/solaris/36513-ftp-connection-problem.html
https://www.experts-exchange.com/questions/20737112/ftp-connection-refused.html
https://serverfault.com/questions/358324/ftp-doesnt-allow-usr-sbin-nologin-user
https://www.linuxquestions.org/questions/linux-newbie-8/etc-shells-pure-ftpd-what-is-the-users-unable-to-log-on-ftp-549590/
https://www.linuxquestions.org/questions/red-hat-31/how-to-ftp-user-with-no-login-shell-169391/
https://books.google.it/books?id=rhLLHiugbDgC&pg=PA205&lpg=PA205&dq=ftp+login+refused+shell+not+in+etc+shells
https://utcc.utoronto.ca/~cks/space/blog/unix/EtcShellsUsage