Hi, as I said previously you need to open this port for the other nodes in cluster, if you seen that they are closed by telnet, then investigate you iptables or what firewall you use, rules.

Make for example iptables-save our iptables -L -n to list your existing FW config or if firewall is allowed, check the networking connection then.

Also You need to have a basic networking and sys administration knowledge before you’ll start this tutorial.