Correction in "Creating Let's Encrypt SSL Certificates and Installing Coturn on Ubuntu 18.04for OpenMeetings 5.0.1"

[Ali Alhaidary]

simple correction:

sudo iptables -A OUT -p udp --match multiport --dports 49152:65535 -j ACCEPT
should be:

sudo iptables -A OUTPUT -p udp --match multiport --dports 49152:65535 -j 
ACCEPT

and since a conflict could be there between iptables and ufw, saving is 
done via the command:

sudo /sbin/iptables-save