Morello Linux remote ssh not working

I am trying to enable somebody to remote SSH into my box. I was able to edit the SSH configuration files and restart the service. However, I could not connect to port 3999 nor could I manipulate the firewall rules. Can somebody post simple instructions on how to open porch 399 on my Morello box? There does not seem to be a driver for IP tables and UFW is not installed. What do I need to install, how can I make this work?

Also, the forum was down for posting yesterday.