Hi @niethammer, welcome to the Cayenne Community.
I'm glad you figured it out, and apologize for the wasted time. I'll look into adding the ports to our install documentation -- in the meantime, here is the full list of ports we use in various capacities. They aren't all necessary unless you use a wide variety of devices (Pi, Arduino, MQTT).
443 for HTTPS
8442 for Arduino
8181 for Raspberry Pi
50xx for cloud server websockets
80 for regular HTTP
1883 and 8883 for MQTT