FirewallD is my active firewall, however, mxtoolbox tcp:<server_external_ipaddress>:2304 "refused"

I am trying to see if a port i have opened in firewalld is actually accessible from outside.

The reason for this is because i have had some problems with automatic provisioning modules (Blesta) accessing the server to interract with it for user accounts and webhosting services.

Webmin>Networking>FirewallD>Public (default)

added allowed port “2304”

A check of firewall rules returns the following:

firewall-cmd --list-all
public (active)
target: default
icmp-block-inversion: no
interfaces: ens3 lo
services: ssh dhcpv6-client smtp smtps ftp pop3 pop3s imap imaps http https
ports: 587/tcp 53/tcp 20/tcp 2222/tcp 10000-10100/tcp 20000/tcp 1025-65535/tcp 53/udp 2304/tcp
masquerade: no
rich rules:

However, if i run a tcp scan using mxtoolbox


i get “refused”

So my understanding is that there are two reasons for this…

  1. the port is blocked
  2. nothing is listening on said port

I am running both blesta and whmcs on different virtual sub servers.
How can i check whmcs and blesta are able to communicate in or out of the firewall through this port whenv provisioning services on other external systems?