TCP:8000-8020 UDP: 64090-64110
For those of you who have firewalls in place. 
Hope it helps save some time and frustration.
Why would you need to port forward these ports?
Never had an issue here. Granted not going crazy with the firewall on the Ubiquiti either.
Phase123 was having issues connecting to SC. He is running two firewalls. Those are the ports the servers use to connect with the client. Just making the information available for those behind a firewall or two.