Ubuntu 20.04 LTS with vsFTPd

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This Azure Cloud Image version featuring vsFTPd is an excellent choice for businesses of any size. vsFTPd is a highly regarded FTP solution for Linux/Unix systems. It is well-known for being both secure and user-friendly.

Applying:

To upload and download files.
To transfer files between the server and your computer.
To connect multiple computers across the Internet in a simple way.

Features:

Virtual IP configurations
Virtual users
Standalone or inetd operation
Powerful per-user configurability
Per-source-IP configurability
Per-source-IP limits
Encryption support through SSL integration etc.

The following ports are required to be opened if you are using an NSG or firewall appliance:

20 (FTP-data)
21 (FTP)
30000-31000 (optional, for Passive Mode)