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You should open port 443 for the HTTPS communication, 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 that use: 

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).