Setting up Linux server...what ports to open?

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Just to let you know the TCP communication is only used between the loginserver <- world <- zone (communication is setup this way between the different server exe's).

UDP is the only requirement for clients connecting to any of these servers.

It is just good to note this because when you open up TCP you leave your server communications vulnerable - such as if someone figured out your zspassword they could connect and do nasty stuff.