Just in case this is the Filezilla log:
Status: Connection established, waiting for welcome message...
Response: 220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
Response: 220-You are user number 1 of 50 allowed.
Response: 220-Local time is now 00:35. Server port: 21.
Response: 220-IPv6 connections are also welcome on this server.
Response: 220 You will be disconnected after 15 minutes of inactivity.
Command: AUTH TLS
Response: 234 AUTH TLS OK.
Status: Initializing TLS...
Error: GnuTLS error -110: The TLS connection was non-properly terminated.
Status: Server did not properly shut down TLS connection
Error: Could not connect to server
IP: --
FTP GnuTLS error 110: The TLS connection was non-properly terminated
Try to restart the service of pure-ftpd or reinstall it. Use command to restart the service: service pure-ftpd restart.
If you still face the issue then you can open a support ticket on the webuzo site.
https://softaculous.deskuss.com/.