Steps to resolve errors that occur with SSL/TLS setup on QBox

You may see errors like " Connection attempt failed with “EHOSTUNREACH - No route to host” or “GnuTLS error -110: The TLS connection was non-properly terminated” and be unable to connect and transfer files between external client and QBox Server. If this is seen after creating ssl certificate and key using openssl, which is required to setup FTP over SSL/TLS (called FTPS), please make sure you have made correct changes to vsftpd.conf file.
For further assistance, refer to https://www.tecmint.com/secure-ftp-server-using-ssl-tls-on-ubuntu/