sudo iptables -nvL
sudo iptables -t nat -vnL unfiltered_web
sudo iptables -t nat -vnL PREROUTING
sudo iptables -vnL FORWARD
!

sudo iptables -t nat -vnL unfiltered_web –line-numbers

!
sudo tail -f /var/log/messages

Added a line in the input chain to allow access

iptables -I INPUT 9 -p tcp -s 93.97.239.164/31 -d 85.234.71.225 –dport 3389 -j ACCEPT
iptables -R INPUT 9 -p tcp -s 93.97.239.164/31 -d 85.234.71.225 –dport 3389 -j ACCEPT
This should give access to the RDP session.

iptables -I  = Insert Rule
iptables -R = Replace Rule

Delete an Entry :

sudo iptables -D INPUT 9

Monitor iptables :

watch sudo iptables -nvL INPUT
watch sudo iptables -nvL OUTPUT
watch sudo iptables -nvL FORWARD