Port forwarding Issue | CSF and IFD | Multicraft

[justsimplehosting]

I've been messing around with multicraft the last couple of months.
I've tested my config on my inhouse lab on a standard install of centos 7.
Lamp server with phpmyadmin, multicraft, csf firewall and bitninja security.
I've open the ports within csf and added them to the IP table.
If you run a open port checker on the server straight after a restart the port appears open, after a few minutes you run another scan and it appears closed. The services running on that port still work just fine making me believe its a ping issue.
Can anyone suggest anything to correct this issue?
Its having a knock on effect as when you try and list the server as online within an mc server list it shows as offline when its not?

 

[justsimplehosting]

Conclusion on the issue I was having.
Had nothing to do with CSF or IFD but to do with BitNinja.
I believe the IP filtering system that BitNinja provides protects the server from port scans or monitoring.
Its not an issue I've run into with website hosting before as its not been a problem.
What do you think about game hosting, compared to website hosting or other types of hosting?
What issues have you run into?