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The error reports because the FTP SSL encryption settings are incorrect while connection.

Please use following settings into your FTP client as (Options in Filezilla)

Main >> Service Configuration >> FTP Server Configuration TLS Encryption Support >> “optional”

Settings:

Host: domain name or server Ip
Port : 21
Server Type : FTPES -FTP over explicit TLS/SSL
Enable the passive port range for Pure-FTPd
For that you need to modify FTP configuration file vim /etc/pure-ftpd.conf configuration file
Enable the passive port range as PassivePortRange 30000 65000 then Save the pure-ftpd.conf file and restart FTP service. Also enable the passive port range into server firewall

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