Network Requirements

You should open port 443 for the HTTPS communication and port 80 for HTTP communication (optional).

Please also make sure the websocket and UDP (for the local time synchronization) communications are working on the network properly.

Ports and tools used:

Tool	Port
Nginx	80, 443/TCP - inbound
OpenSSH	22/TCP - inbound
Docker daemon	2376/TCP - inbound (enough to restrict to our Management server's IP).This is optional, if security is a concern, we can manage containers locally.
Chrony	123/UDP. This is optional, it needs if you want to use content synchronization (instead of local UDP local time synchronization).