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#userlist_deny — When used in conjunction with the userlist_enable directive and set to NO, all local users are denied access unless the username is listed in the file specified by the userlist_file directive. Because access is denied before the client is asked for a password, setting this directive to NO prevents local users from submitting unencrypted passwords over the network.The default value is YES.#userlist_enable — When enabled, the users listed in the file specified by the userlist_file directive are denied access. Because access is denied before the client is asked for a password, users are prevented from submitting unencrypted passwords over the network.The default value is NO, however under Red Hat Enterprise Linux the value is set to YES.#userlist_file — Specifies the file referenced by vsftpd when the userlist_enable directive is enabled.The default value is /etc/vsftpd.user_list.