Enterprise Port Forwarding

Are there specific ports for sharing of files via an IP address?

On a server that was working, after resetting the ISP’s router to default settings, I did a DMZ forward to the internal private IP of the Enterprise server but that is not working. If the local users attempt to connect via the external IP, they get a connection error. If I use the Test button in the Server Domain dialog, it fails. I have the Server Domain set to the External IP.

And the answer is…

Port 80 & any VNC ports necessary to remote in.