Tridium Niagara 4 will us several default ports to access a Host / Platform / Station.

Secure Ports
Secure Platform – 5011
Secure FOX – 4911
Secure Web – 443

Non-Secure Ports (Legacy)
It is strongly recommended to ONLY use secure connections.
Non-Secure Platform – 3011
Non-Secure Fox – 1911
Non-Secure Web – 80

It is strongly recommended to never expose a controller to internet / public facing traffic. The use of a more secure connection should be implemented (i.e. VPN).