installing ftp server

vsftpd.sh

sudo apt-get update
 sudo apt install vsftpd
#configure vsftpd-
sudo nano /etc/vsftpd.conf
sudo service vsftpd restart
sudo systemctl status vsftpd
sudo systemctl enable vsftpd

# Configure Firewall
sudo apt-get install ssh
sudo ufw enable
sudo ufw allow 22
sudo ufw allow OpenSSH

# Open port 20 & 21 for FTP
sudo ufw allow 20/tcp
sudo ufw allow 21/tcp

# Open port 40000-50000 for passive FTP
sudo ufw allow 40000:50000/tcp

# Open port 990 for TLS
sudo ufw allow 990/tcp

# Check status
sudo ufw status

# Create FTP User
sudo adduser ftpuser
sudo nano /etc/ssh/sshd_config

-- add the line at bottom [DenyUsers ftpuser]

sudo service sshd restart
# Enable Firewall
sudo ufw enable
# Open a port
sudo ufw allow 22

# Allow port
sudo ufw insert 1 allow 80
#Deny port
sudo ufw deny 22

# Remove or delete rule
sudo ufw delete deny 22
#Allows SSH access from host 192.168.0.2 to any IP address on this host
sudo ufw allow proto tcp from 192.168.0.2 to any port 22

# Replace 192.168.0.2 with 192.168.0.0/24 to allow SSH access from the entire subnet.

Adding the --dry-run option to a ufw command will output the resulting rules, but not apply them. For example, the following is what would be applied if opening the HTTP port:

sudo ufw --dry-run allow http