Problem: You have a VPS (virtual private server). You can not access to one FTP server from your IP. You can access it from your VPS.
Solution: Use Xshell and WinSCP
Step 1. Setup tunneling from Xshell for your SSH connection to VPS
Select menu/button: Properties => Tunneling => Add
Enter:
Type = Dynamic SOCKS4/5
Listening Port = 1080 (You can change it, please use unused port. Tips: use telnet command to check port)
Step 2. Setup proxy configuration for WinSCP
Ensure you enter your port - which you set at above step