Problem:
Centos7 installation FTP suddenly failed to log in and displayed a 503 error. There is no problem with the vsftpd.conf configuration, but I just can't log in.
Error screenshot:
(Recommended tutorial: centos tutorial)
Solution:
Later, I queried the solution and located the problem on /etc/pam.d/vsftpd.
Main comments#auth required pam_shells.so will do.
Login successful
Related video tutorial recommendations: linux video tutorial
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