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I need to config my server so that users only be able to access some ports...
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That's firewall
That's a group control, not firewall, you have to open the mysql port on the firewall, but access to the engine is controlled by group (mysql group) rights
See mysql
Try this, type "#groups" and figure out what every one of those groups is for. If you get stuck, post back, but that will give you a better grasp of how to control access to your server.