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I’m running all my microservices on a couple of repurposed NUC5i5RYKs, running Ubuntu Server 22.04 (I know I know) and Docker. They’ve been absolutely rock steady thus far, though not quite as overkill as I like all my computers to be. But I got them in 2015 and they’ve held up more than admirably.
80, 443 for HTTP/S, and 587 for a VPN service. Reason being that I travel frequently, and often have to connect through a bunch of different networks, Airport WiFi, mobile roaming, hotel WiFi, etc. and you never know the kinds of network restrictions they impose on their pipes.
80 and 443 is least likely to be dropped, while 587 is a common SMTP port that could make it through most networks.