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4500 - Authport
4514 - standard-Gameserverport, but you can change it via "S io.port"
All other ones must be closed (4501/4502/4515(?)) since those are the ports where you can get access to the server and "hack" it.
Edit: After a discussion with c1ph3r, the Standard-Port is 4514 instead of 4518 <.<
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