Ubuntu 20.04
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FTP : Pure-FTPd Over SSL/TLS2020/05/13

Configure Pure-FTPd to use SSL/TLS.
[1] Create self-signed certificates. but if you use valid certificates like from Let's Encrypt or others, you don't need to create this one.
cd /etc/ssl/private

openssl req -x509 -nodes -newkey rsa:2048 -keyout pure-ftpd.pem -out pure-ftpd.pem -days 365

Generating a 2048 bit RSA private key
writing new private key to 'pure-ftpd.pem'
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
Country Name (2 letter code) [AU]:JP   # country code
State or Province Name (full name) [Some-State]:Hiroshima       # state
Locality Name (eg, city) []:Hiroshima  # city
Organization Name (eg, company) [Internet Widgits Pty Ltd]:GTS  # company
Organizational Unit Name (eg, section) []:Server World          # department
Common Name (e.g. server FQDN or YOUR name) []:www.srv.world    # server's FQDN
Email Address []:root@srv.world        # admin's email

chmod 600 pure-ftpd.pem

[2] Configure Pure-FTPd.
echo "2" > /etc/pure-ftpd/conf/TLS
systemctl restart pure-ftpd

FTP Client : Ubuntu
Configure FTP Client to use FTPS connection.
[3] Install FTP Client on Ubuntu and configure like follows.
vi ~/.lftprc
# create new

set ftp:ssl-auth TLS
set ftp:ssl-force true
set ftp:ssl-protect-list yes
set ftp:ssl-protect-data yes
set ftp:ssl-protect-fxp yes
set ssl:verify-certificate no
lftp -u ubuntu www.srv.world

lftp ubuntu@www.srv.world:~>
FTP Client : Windows
[4] For example of FileZilla on Windows, Open [File] - [Site Manager].
[5] Input connection infomation like follows, and for encryption field, select [Require explicit FTP over TLS].
[6] User's Password is required. Input it.
[7] If you set self-signed certificate, following warning is shown, it's no ploblem. Go next.
[8] Just connected with FTPS.
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