Re: What port(s) do I need to open for Anaplan Connect?
443 is the listening port, so it doesn’t need to be opened on the client side. Communication goes out on a port (pseudo)randomly chosen by the network card, and returns on the same port. Technically, no ports need to be opened on the firewall, as long as outbound connections are permitted there shouldn't be any issue. If there is an issue, be sure that the api subdomain is whitelisted by the firewall and proxy (if applicable).
I'd recommend using a wildcard, if possible, to whitelist all Anaplan subdomains (i.e. *.anaplan.com), or whitelist api.anaplan.com:443.
Jesse Wilson Solution Architect - Data Integrations Singapore