If the service is not listening on the expected port, the firewall isn’t the issue. Linux (iptables / nftables / firewalld / ufw) Using iptables (legacy):
The firewall is blocking the incoming (inbound) traffic. inbound traffic blocked, check firewall settings
sudo firewall-cmd --list-all Check the services and ports sections. If your port is missing, inbound traffic is blocked. If the service is not listening on the