Config iptables VNC blocked

iptables_clear_rules.sh

iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT

iptables_console.sh

#Basically, Console Access option will open a VNC connection to your Droplet.

#VNC is a graphical desktop sharing system, where you see the screen of the Droplet on your computer.

#It normally uses a random port to connect the browser with the vnc service. 
#Since multiple services are run on each machine that accommodates these Droplets, the port used will be a random one. 
#Usually, it will be in the 5900-7000 range.

#Notes : some port may be blocked by ISP (Internet Service Provider)

sudo iptables -A INPUT -p tcp --dport 5800 -j ACCEPT # some port using 5800 to establish VNC Console
# or
sudo iptables -A INPUT -p tcp --dport 5900-7000 -j ACCEPT # some port using between port 5900-7000

sudo netfilter-persistent save # to save the iptables rule