What ports need to be open in the firewall to resolve connection issues with auth.cpanel.net?
Port 2089 is the official license port. If this port fails to connect, the software will also try connecting to the below ports:
80, 2089, 110, 143, 25, 23, 993, 995
Servers should at least have port 53 open outbound for TCP and UDP traffic in order to resolve the DNS for the licensing servers. Port 2083 inbound is used to deploy the license file, so it should be open.