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Hi @taimaz,
As explained in the article, you’ll need to edit the port in the Apache’s configuration file :
Listen 80
To
Listen 81
Having said that, once you do, you’ll need to restart apache and actually enable traffic on that port. To allow all incoming connections on port 81 run these commands:
sudo iptables -A INPUT -p tcp --dport 81 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT.
sudo iptables -A OUTPUT -p tcp --sport 81 -m conntrack --ctstate ESTABLISHED -j ACCEPT.
Regards, KDSys