FT Server Status: Insecure server, it does not support FTP over TLS

I am creating FTP server (vsftpd) on GCP. After resolving several errors throughout the process. finally, I am able to connect with the FTP server via Filezilla and Winscp too. I am getting a warning Status: Insecure server, it does not support FTP over TLS. What's the reason behind it.

#/etc/vsftpd.conf
listen=NO
listen_ipv6=YES
write_enable=YES
secure_chroot_dir=/var/run/vsftpd/empty
pam_service_name=vsftpd
rsa_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
rsa_private_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
ssl_enable=NO
user_sub_token=$USER
local_root=/home/$USER/ftp
#PassiveMode_settings
pasv_enable=YES
pasv_min_port=40000
pasv_max_port=50000
userlist_enable=YES
userlist_file=/etc/vsftpd.userlist
userlist_deny=NO
allow_writeable_chroot=YES

Ports Opened tcp:20,21,990,40000-50000,443,22

1 Answer

ssl_enable=NO

It clearly says NO SSL.